2 # (C) Copyright 2000 - 2011
3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 # See file CREDITS for list of people who contributed to this
8 # This program is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU General Public License as
10 # published by the Free Software Foundation; either version 2 of
11 # the License, or (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 This directory contains the source code for U-Boot, a boot loader for
28 Embedded boards based on PowerPC, ARM, MIPS and several other
29 processors, which can be installed in a boot ROM and used to
30 initialize and test the hardware or to download and run application
33 The development of U-Boot is closely related to Linux: some parts of
34 the source code originate in the Linux source tree, we have some
35 header files in common, and special provision has been made to
36 support booting of Linux images.
38 Some attention has been paid to make this software easily
39 configurable and extendable. For instance, all monitor commands are
40 implemented with the same call interface, so that it's very easy to
41 add new commands. Also, instead of permanently adding rarely used
42 code (for instance hardware test utilities) to the monitor, you can
43 load and run it dynamically.
49 In general, all boards for which a configuration option exists in the
50 Makefile have been tested to some extent and can be considered
51 "working". In fact, many of them are used in production systems.
53 In case of problems see the CHANGELOG and CREDITS files to find out
54 who contributed the specific port. The MAINTAINERS file lists board
61 In case you have questions about, problems with or contributions for
62 U-Boot you should send a message to the U-Boot mailing list at
63 <u-boot@lists.denx.de>. There is also an archive of previous traffic
64 on the mailing list - please search the archive before asking FAQ's.
65 Please see http://lists.denx.de/pipermail/u-boot and
66 http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
69 Where to get source code:
70 =========================
72 The U-Boot source code is maintained in the git repository at
73 git://www.denx.de/git/u-boot.git ; you can browse it online at
74 http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
76 The "snapshot" links on this page allow you to download tarballs of
77 any version you might be interested in. Official releases are also
78 available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
81 Pre-built (and tested) images are available from
82 ftp://ftp.denx.de/pub/u-boot/images/
88 - start from 8xxrom sources
89 - create PPCBoot project (http://sourceforge.net/projects/ppcboot)
91 - make it easier to add custom boards
92 - make it possible to add other [PowerPC] CPUs
93 - extend functions, especially:
94 * Provide extended interface to Linux boot loader
97 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
98 - create ARMBoot project (http://sourceforge.net/projects/armboot)
99 - add other CPU families (starting with ARM)
100 - create U-Boot project (http://sourceforge.net/projects/u-boot)
101 - current project page: see http://www.denx.de/wiki/U-Boot
107 The "official" name of this project is "Das U-Boot". The spelling
108 "U-Boot" shall be used in all written text (documentation, comments
109 in source files etc.). Example:
111 This is the README file for the U-Boot project.
113 File names etc. shall be based on the string "u-boot". Examples:
115 include/asm-ppc/u-boot.h
117 #include <asm/u-boot.h>
119 Variable names, preprocessor constants etc. shall be either based on
120 the string "u_boot" or on "U_BOOT". Example:
122 U_BOOT_VERSION u_boot_logo
123 IH_OS_U_BOOT u_boot_hush_start
129 Starting with the release in October 2008, the names of the releases
130 were changed from numerical release numbers without deeper meaning
131 into a time stamp based numbering. Regular releases are identified by
132 names consisting of the calendar year and month of the release date.
133 Additional fields (if present) indicate release candidates or bug fix
134 releases in "stable" maintenance trees.
137 U-Boot v2009.11 - Release November 2009
138 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
139 U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
145 /arch Architecture specific files
146 /arm Files generic to ARM architecture
147 /cpu CPU specific files
148 /arm720t Files specific to ARM 720 CPUs
149 /arm920t Files specific to ARM 920 CPUs
150 /at91rm9200 Files specific to Atmel AT91RM9200 CPU
151 /imx Files specific to Freescale MC9328 i.MX CPUs
152 /s3c24x0 Files specific to Samsung S3C24X0 CPUs
153 /arm925t Files specific to ARM 925 CPUs
154 /arm926ejs Files specific to ARM 926 CPUs
155 /arm1136 Files specific to ARM 1136 CPUs
156 /ixp Files specific to Intel XScale IXP CPUs
157 /pxa Files specific to Intel XScale PXA CPUs
158 /s3c44b0 Files specific to Samsung S3C44B0 CPUs
159 /sa1100 Files specific to Intel StrongARM SA1100 CPUs
160 /lib Architecture specific library files
161 /avr32 Files generic to AVR32 architecture
162 /cpu CPU specific files
163 /lib Architecture specific library files
164 /blackfin Files generic to Analog Devices Blackfin architecture
165 /cpu CPU specific files
166 /lib Architecture specific library files
167 /x86 Files generic to x86 architecture
168 /cpu CPU specific files
169 /lib Architecture specific library files
170 /m68k Files generic to m68k architecture
171 /cpu CPU specific files
172 /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
173 /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
174 /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
175 /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
176 /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
177 /lib Architecture specific library files
178 /microblaze Files generic to microblaze architecture
179 /cpu CPU specific files
180 /lib Architecture specific library files
181 /mips Files generic to MIPS architecture
182 /cpu CPU specific files
183 /lib Architecture specific library files
184 /nios2 Files generic to Altera NIOS2 architecture
185 /cpu CPU specific files
186 /lib Architecture specific library files
187 /powerpc Files generic to PowerPC architecture
188 /cpu CPU specific files
189 /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
190 /mpc5xx Files specific to Freescale MPC5xx CPUs
191 /mpc5xxx Files specific to Freescale MPC5xxx CPUs
192 /mpc8xx Files specific to Freescale MPC8xx CPUs
193 /mpc8220 Files specific to Freescale MPC8220 CPUs
194 /mpc824x Files specific to Freescale MPC824x CPUs
195 /mpc8260 Files specific to Freescale MPC8260 CPUs
196 /mpc85xx Files specific to Freescale MPC85xx CPUs
197 /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
198 /lib Architecture specific library files
199 /sh Files generic to SH architecture
200 /cpu CPU specific files
201 /sh2 Files specific to sh2 CPUs
202 /sh3 Files specific to sh3 CPUs
203 /sh4 Files specific to sh4 CPUs
204 /lib Architecture specific library files
205 /sparc Files generic to SPARC architecture
206 /cpu CPU specific files
207 /leon2 Files specific to Gaisler LEON2 SPARC CPU
208 /leon3 Files specific to Gaisler LEON3 SPARC CPU
209 /lib Architecture specific library files
210 /api Machine/arch independent API for external apps
211 /board Board dependent files
212 /common Misc architecture independent functions
213 /disk Code for disk drive partition handling
214 /doc Documentation (don't expect too much)
215 /drivers Commonly used device drivers
216 /examples Example code for standalone applications, etc.
217 /fs Filesystem code (cramfs, ext2, jffs2, etc.)
218 /include Header Files
219 /lib Files generic to all architectures
220 /libfdt Library files to support flattened device trees
221 /lzma Library files to support LZMA decompression
222 /lzo Library files to support LZO decompression
224 /post Power On Self Test
225 /rtc Real Time Clock drivers
226 /tools Tools to build S-Record or U-Boot images, etc.
228 Software Configuration:
229 =======================
231 Configuration is usually done using C preprocessor defines; the
232 rationale behind that is to avoid dead code whenever possible.
234 There are two classes of configuration variables:
236 * Configuration _OPTIONS_:
237 These are selectable by the user and have names beginning with
240 * Configuration _SETTINGS_:
241 These depend on the hardware etc. and should not be meddled with if
242 you don't know what you're doing; they have names beginning with
245 Later we will add a configuration tool - probably similar to or even
246 identical to what's used for the Linux kernel. Right now, we have to
247 do the configuration by hand, which means creating some symbolic
248 links and editing some configuration files. We use the TQM8xxL boards
252 Selection of Processor Architecture and Board Type:
253 ---------------------------------------------------
255 For all supported boards there are ready-to-use default
256 configurations available; just type "make <board_name>_config".
258 Example: For a TQM823L module type:
263 For the Cogent platform, you need to specify the CPU type as well;
264 e.g. "make cogent_mpc8xx_config". And also configure the cogent
265 directory according to the instructions in cogent/README.
268 Configuration Options:
269 ----------------------
271 Configuration depends on the combination of board and CPU type; all
272 such information is kept in a configuration file
273 "include/configs/<board_name>.h".
275 Example: For a TQM823L module, all configuration settings are in
276 "include/configs/TQM823L.h".
279 Many of the options are named exactly as the corresponding Linux
280 kernel configuration options. The intention is to make it easier to
281 build a config tool - later.
284 The following options need to be configured:
286 - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
288 - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
290 - CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
291 Define exactly one, e.g. CONFIG_ATSTK1002
293 - CPU Module Type: (if CONFIG_COGENT is defined)
294 Define exactly one of
296 --- FIXME --- not tested yet:
297 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
298 CONFIG_CMA287_23, CONFIG_CMA287_50
300 - Motherboard Type: (if CONFIG_COGENT is defined)
301 Define exactly one of
302 CONFIG_CMA101, CONFIG_CMA102
304 - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
305 Define one or more of
308 - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
309 Define one or more of
310 CONFIG_LCD_HEARTBEAT - update a character position on
311 the LCD display every second with
314 - Board flavour: (if CONFIG_MPC8260ADS is defined)
317 CONFIG_SYS_8260ADS - original MPC8260ADS
318 CONFIG_SYS_8266ADS - MPC8266ADS
319 CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
320 CONFIG_SYS_8272ADS - MPC8272ADS
322 - Marvell Family Member
323 CONFIG_SYS_MVFS - define it if you want to enable
324 multiple fs option at one time
325 for marvell soc family
327 - MPC824X Family Member (if CONFIG_MPC824X is defined)
328 Define exactly one of
329 CONFIG_MPC8240, CONFIG_MPC8245
331 - 8xx CPU Options: (if using an MPC8xx CPU)
332 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
333 get_gclk_freq() cannot work
334 e.g. if there is no 32KHz
335 reference PIT/RTC clock
336 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
339 - 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
340 CONFIG_SYS_8xx_CPUCLK_MIN
341 CONFIG_SYS_8xx_CPUCLK_MAX
342 CONFIG_8xx_CPUCLK_DEFAULT
343 See doc/README.MPC866
345 CONFIG_SYS_MEASURE_CPUCLK
347 Define this to measure the actual CPU clock instead
348 of relying on the correctness of the configured
349 values. Mostly useful for board bringup to make sure
350 the PLL is locked at the intended frequency. Note
351 that this requires a (stable) reference clock (32 kHz
352 RTC clock or CONFIG_SYS_8XX_XIN)
354 CONFIG_SYS_DELAYED_ICACHE
356 Define this option if you want to enable the
357 ICache only when Code runs from RAM.
360 CONFIG_SYS_FSL_TBCLK_DIV
362 Defines the core time base clock divider ratio compared to the
363 system clock. On most PQ3 devices this is 8, on newer QorIQ
364 devices it can be 16 or 32. The ratio varies from SoC to Soc.
366 - Intel Monahans options:
367 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
369 Defines the Monahans run mode to oscillator
370 ratio. Valid values are 8, 16, 24, 31. The core
371 frequency is this value multiplied by 13 MHz.
373 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
375 Defines the Monahans turbo mode to oscillator
376 ratio. Valid values are 1 (default if undefined) and
377 2. The core frequency as calculated above is multiplied
380 - Linux Kernel Interface:
383 U-Boot stores all clock information in Hz
384 internally. For binary compatibility with older Linux
385 kernels (which expect the clocks passed in the
386 bd_info data to be in MHz) the environment variable
387 "clocks_in_mhz" can be defined so that U-Boot
388 converts clock data to MHZ before passing it to the
390 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
391 "clocks_in_mhz=1" is automatically included in the
394 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
396 When transferring memsize parameter to linux, some versions
397 expect it to be in bytes, others in MB.
398 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
402 New kernel versions are expecting firmware settings to be
403 passed using flattened device trees (based on open firmware
407 * New libfdt-based support
408 * Adds the "fdt" command
409 * The bootm command automatically updates the fdt
411 OF_CPU - The proper name of the cpus node (only required for
412 MPC512X and MPC5xxx based boards).
413 OF_SOC - The proper name of the soc node (only required for
414 MPC512X and MPC5xxx based boards).
415 OF_TBCLK - The timebase frequency.
416 OF_STDOUT_PATH - The path to the console device
418 boards with QUICC Engines require OF_QE to set UCC MAC
421 CONFIG_OF_BOARD_SETUP
423 Board code has addition modification that it wants to make
424 to the flat device tree before handing it off to the kernel
428 This define fills in the correct boot CPU in the boot
429 param header, the default value is zero if undefined.
433 U-Boot can detect if an IDE device is present or not.
434 If not, and this new config option is activated, U-Boot
435 removes the ATA node from the DTS before booting Linux,
436 so the Linux IDE driver does not probe the device and
437 crash. This is needed for buggy hardware (uc101) where
438 no pull down resistor is connected to the signal IDE5V_DD7.
440 - vxWorks boot parameters:
442 bootvx constructs a valid bootline using the following
443 environments variables: bootfile, ipaddr, serverip, hostname.
444 It loads the vxWorks image pointed bootfile.
446 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
447 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
448 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
449 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
451 CONFIG_SYS_VXWORKS_ADD_PARAMS
453 Add it at the end of the bootline. E.g "u=username pw=secret"
455 Note: If a "bootargs" environment is defined, it will overwride
456 the defaults discussed just above.
461 Define this if you want support for Amba PrimeCell PL010 UARTs.
465 Define this if you want support for Amba PrimeCell PL011 UARTs.
469 If you have Amba PrimeCell PL011 UARTs, set this variable to
470 the clock speed of the UARTs.
474 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
475 define this to a list of base addresses for each (supported)
476 port. See e.g. include/configs/versatile.h
478 CONFIG_PL011_SERIAL_RLCR
480 Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
481 have separate receive and transmit line control registers. Set
482 this variable to initialize the extra register.
484 CONFIG_PL011_SERIAL_FLUSH_ON_INIT
486 On some platforms (e.g. U8500) U-Boot is loaded by a second stage
487 boot loader that has already initialized the UART. Define this
488 variable to flush the UART at init time.
492 Depending on board, define exactly one serial port
493 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
494 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
495 console by defining CONFIG_8xx_CONS_NONE
497 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
498 port routines must be defined elsewhere
499 (i.e. serial_init(), serial_getc(), ...)
502 Enables console device for a color framebuffer. Needs following
503 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
504 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
506 VIDEO_HW_RECTFILL graphic chip supports
509 VIDEO_HW_BITBLT graphic chip supports
510 bit-blit (cf. smiLynxEM)
511 VIDEO_VISIBLE_COLS visible pixel columns
513 VIDEO_VISIBLE_ROWS visible pixel rows
514 VIDEO_PIXEL_SIZE bytes per pixel
515 VIDEO_DATA_FORMAT graphic data format
516 (0-5, cf. cfb_console.c)
517 VIDEO_FB_ADRS framebuffer address
518 VIDEO_KBD_INIT_FCT keyboard int fct
519 (i.e. i8042_kbd_init())
520 VIDEO_TSTC_FCT test char fct
522 VIDEO_GETC_FCT get char fct
524 CONFIG_CONSOLE_CURSOR cursor drawing on/off
525 (requires blink timer
527 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
528 CONFIG_CONSOLE_TIME display time/date info in
530 (requires CONFIG_CMD_DATE)
531 CONFIG_VIDEO_LOGO display Linux logo in
533 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
534 linux_logo.h for logo.
535 Requires CONFIG_VIDEO_LOGO
536 CONFIG_CONSOLE_EXTRA_INFO
537 additional board info beside
540 When CONFIG_CFB_CONSOLE is defined, video console is
541 default i/o. Serial console can be forced with
542 environment 'console=serial'.
544 When CONFIG_SILENT_CONSOLE is defined, all console
545 messages (by U-Boot and Linux!) can be silenced with
546 the "silent" environment variable. See
547 doc/README.silent for more information.
550 CONFIG_BAUDRATE - in bps
551 Select one of the baudrates listed in
552 CONFIG_SYS_BAUDRATE_TABLE, see below.
553 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
555 - Console Rx buffer length
556 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
557 the maximum receive buffer length for the SMC.
558 This option is actual only for 82xx and 8xx possible.
559 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
560 must be defined, to setup the maximum idle timeout for
563 - Boot Delay: CONFIG_BOOTDELAY - in seconds
564 Delay before automatically booting the default image;
565 set to -1 to disable autoboot.
567 See doc/README.autoboot for these options that
568 work with CONFIG_BOOTDELAY. None are required.
569 CONFIG_BOOT_RETRY_TIME
570 CONFIG_BOOT_RETRY_MIN
571 CONFIG_AUTOBOOT_KEYED
572 CONFIG_AUTOBOOT_PROMPT
573 CONFIG_AUTOBOOT_DELAY_STR
574 CONFIG_AUTOBOOT_STOP_STR
575 CONFIG_AUTOBOOT_DELAY_STR2
576 CONFIG_AUTOBOOT_STOP_STR2
577 CONFIG_ZERO_BOOTDELAY_CHECK
578 CONFIG_RESET_TO_RETRY
582 Only needed when CONFIG_BOOTDELAY is enabled;
583 define a command string that is automatically executed
584 when no character is read on the console interface
585 within "Boot Delay" after reset.
588 This can be used to pass arguments to the bootm
589 command. The value of CONFIG_BOOTARGS goes into the
590 environment value "bootargs".
592 CONFIG_RAMBOOT and CONFIG_NFSBOOT
593 The value of these goes into the environment as
594 "ramboot" and "nfsboot" respectively, and can be used
595 as a convenience, when switching between booting from
601 When this option is #defined, the existence of the
602 environment variable "preboot" will be checked
603 immediately before starting the CONFIG_BOOTDELAY
604 countdown and/or running the auto-boot command resp.
605 entering interactive mode.
607 This feature is especially useful when "preboot" is
608 automatically generated or modified. For an example
609 see the LWMON board specific code: here "preboot" is
610 modified when the user holds down a certain
611 combination of keys on the (special) keyboard when
614 - Serial Download Echo Mode:
616 If defined to 1, all characters received during a
617 serial download (using the "loads" command) are
618 echoed back. This might be needed by some terminal
619 emulations (like "cu"), but may as well just take
620 time on others. This setting #define's the initial
621 value of the "loads_echo" environment variable.
623 - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
625 Select one of the baudrates listed in
626 CONFIG_SYS_BAUDRATE_TABLE, see below.
629 Monitor commands can be included or excluded
630 from the build by using the #include files
631 "config_cmd_all.h" and #undef'ing unwanted
632 commands, or using "config_cmd_default.h"
633 and augmenting with additional #define's
636 The default command configuration includes all commands
637 except those marked below with a "*".
639 CONFIG_CMD_ASKENV * ask for env variable
640 CONFIG_CMD_BDI bdinfo
641 CONFIG_CMD_BEDBUG * Include BedBug Debugger
642 CONFIG_CMD_BMP * BMP support
643 CONFIG_CMD_BSP * Board specific commands
644 CONFIG_CMD_BOOTD bootd
645 CONFIG_CMD_CACHE * icache, dcache
646 CONFIG_CMD_CONSOLE coninfo
647 CONFIG_CMD_CRC32 * crc32
648 CONFIG_CMD_DATE * support for RTC, date/time...
649 CONFIG_CMD_DHCP * DHCP support
650 CONFIG_CMD_DIAG * Diagnostics
651 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
652 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
653 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
654 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
655 CONFIG_CMD_DTT * Digital Therm and Thermostat
656 CONFIG_CMD_ECHO echo arguments
657 CONFIG_CMD_EDITENV edit env variable
658 CONFIG_CMD_EEPROM * EEPROM read/write support
659 CONFIG_CMD_ELF * bootelf, bootvx
660 CONFIG_CMD_EXPORTENV * export the environment
661 CONFIG_CMD_SAVEENV saveenv
662 CONFIG_CMD_FDC * Floppy Disk Support
663 CONFIG_CMD_FAT * FAT partition support
664 CONFIG_CMD_FDOS * Dos diskette Support
665 CONFIG_CMD_FLASH flinfo, erase, protect
666 CONFIG_CMD_FPGA FPGA device initialization support
667 CONFIG_CMD_GO * the 'go' command (exec code)
668 CONFIG_CMD_GREPENV * search environment
669 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
670 CONFIG_CMD_I2C * I2C serial bus support
671 CONFIG_CMD_IDE * IDE harddisk support
672 CONFIG_CMD_IMI iminfo
673 CONFIG_CMD_IMLS List all found images
674 CONFIG_CMD_IMMAP * IMMR dump support
675 CONFIG_CMD_IMPORTENV * import an environment
676 CONFIG_CMD_IRQ * irqinfo
677 CONFIG_CMD_ITEST Integer/string test of 2 values
678 CONFIG_CMD_JFFS2 * JFFS2 Support
679 CONFIG_CMD_KGDB * kgdb
680 CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader)
681 CONFIG_CMD_LOADB loadb
682 CONFIG_CMD_LOADS loads
683 CONFIG_CMD_MD5SUM print md5 message digest
684 (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
685 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
687 CONFIG_CMD_MISC Misc functions like sleep etc
688 CONFIG_CMD_MMC * MMC memory mapped support
689 CONFIG_CMD_MII * MII utility commands
690 CONFIG_CMD_MTDPARTS * MTD partition support
691 CONFIG_CMD_NAND * NAND support
692 CONFIG_CMD_NET bootp, tftpboot, rarpboot
693 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
694 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
695 CONFIG_CMD_PCI * pciinfo
696 CONFIG_CMD_PCMCIA * PCMCIA support
697 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
699 CONFIG_CMD_PORTIO * Port I/O
700 CONFIG_CMD_REGINFO * Register dump
701 CONFIG_CMD_RUN run command in env variable
702 CONFIG_CMD_SAVES * save S record dump
703 CONFIG_CMD_SCSI * SCSI Support
704 CONFIG_CMD_SDRAM * print SDRAM configuration information
705 (requires CONFIG_CMD_I2C)
706 CONFIG_CMD_SETGETDCR Support for DCR Register access
708 CONFIG_CMD_SHA1SUM print sha1 memory digest
709 (requires CONFIG_CMD_MEMORY)
710 CONFIG_CMD_SOURCE "source" command Support
711 CONFIG_CMD_SPI * SPI serial bus support
712 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
713 CONFIG_CMD_USB * USB support
714 CONFIG_CMD_VFD * VFD support (TRAB)
715 CONFIG_CMD_CDP * Cisco Discover Protocol support
716 CONFIG_CMD_FSL * Microblaze FSL support
719 EXAMPLE: If you want all functions except of network
720 support you can write:
722 #include "config_cmd_all.h"
723 #undef CONFIG_CMD_NET
726 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
728 Note: Don't enable the "icache" and "dcache" commands
729 (configuration option CONFIG_CMD_CACHE) unless you know
730 what you (and your U-Boot users) are doing. Data
731 cache cannot be enabled on systems like the 8xx or
732 8260 (where accesses to the IMMR region must be
733 uncached), and it cannot be disabled on all other
734 systems where we (mis-) use the data cache to hold an
735 initial stack and some data.
738 XXX - this list needs to get updated!
742 If this variable is defined, it enables watchdog
743 support for the SoC. There must be support in the SoC
744 specific code for a watchdog. For the 8xx and 8260
745 CPUs, the SIU Watchdog feature is enabled in the SYPCR
746 register. When supported for a specific SoC is
747 available, then no further board specific code should
751 When using a watchdog circuitry external to the used
752 SoC, then define this variable and provide board
753 specific code for the "hw_watchdog_reset" function.
756 CONFIG_VERSION_VARIABLE
757 If this variable is defined, an environment variable
758 named "ver" is created by U-Boot showing the U-Boot
759 version as printed by the "version" command.
760 This variable is readonly.
764 When CONFIG_CMD_DATE is selected, the type of the RTC
765 has to be selected, too. Define exactly one of the
768 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
769 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
770 CONFIG_RTC_MC13783 - use MC13783 RTC
771 CONFIG_RTC_MC146818 - use MC146818 RTC
772 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
773 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
774 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
775 CONFIG_RTC_DS164x - use Dallas DS164x RTC
776 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
777 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
778 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
779 CONFIG_SYS_RV3029_TCR - enable trickle charger on
782 Note that if the RTC uses I2C, then the I2C interface
783 must also be configured. See I2C Support, below.
786 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
787 CONFIG_PCA953X_INFO - enable pca953x info command
789 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
790 chip-ngpio pairs that tell the PCA953X driver the number of
791 pins supported by a particular chip.
793 Note that if the GPIO device uses I2C, then the I2C interface
794 must also be configured. See I2C Support, below.
798 When CONFIG_TIMESTAMP is selected, the timestamp
799 (date and time) of an image is printed by image
800 commands like bootm or iminfo. This option is
801 automatically enabled when you select CONFIG_CMD_DATE .
804 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
805 and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
807 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
808 CONFIG_CMD_SCSI) you must configure support for at
809 least one partition type as well.
812 CONFIG_IDE_RESET_ROUTINE - this is defined in several
813 board configurations files but used nowhere!
815 CONFIG_IDE_RESET - is this is defined, IDE Reset will
816 be performed by calling the function
817 ide_set_reset(int reset)
818 which has to be defined in a board specific file
823 Set this to enable ATAPI support.
828 Set this to enable support for disks larger than 137GB
829 Also look at CONFIG_SYS_64BIT_LBA.
830 Whithout these , LBA48 support uses 32bit variables and will 'only'
831 support disks up to 2.1TB.
833 CONFIG_SYS_64BIT_LBA:
834 When enabled, makes the IDE subsystem use 64bit sector addresses.
838 At the moment only there is only support for the
839 SYM53C8XX SCSI controller; define
840 CONFIG_SCSI_SYM53C8XX to enable it.
842 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
843 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
844 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
845 maximum numbers of LUNs, SCSI ID's and target
847 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
849 - NETWORK Support (PCI):
851 Support for Intel 8254x gigabit chips.
853 CONFIG_E1000_FALLBACK_MAC
854 default MAC for empty EEPROM after production.
857 Support for Intel 82557/82559/82559ER chips.
858 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
859 write routine for first time initialisation.
862 Support for Digital 2114x chips.
863 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
864 modem chip initialisation (KS8761/QS6611).
867 Support for National dp83815 chips.
870 Support for National dp8382[01] gigabit chips.
872 - NETWORK Support (other):
874 CONFIG_DRIVER_AT91EMAC
875 Support for AT91RM9200 EMAC.
878 Define this to use reduced MII inteface
880 CONFIG_DRIVER_AT91EMAC_QUIET
881 If this defined, the driver is quiet.
882 The driver doen't show link status messages.
884 CONFIG_DRIVER_LAN91C96
885 Support for SMSC's LAN91C96 chips.
888 Define this to hold the physical address
889 of the LAN91C96's I/O space
891 CONFIG_LAN91C96_USE_32_BIT
892 Define this to enable 32 bit addressing
894 CONFIG_DRIVER_SMC91111
895 Support for SMSC's LAN91C111 chip
898 Define this to hold the physical address
899 of the device (I/O space)
901 CONFIG_SMC_USE_32_BIT
902 Define this if data bus is 32 bits
904 CONFIG_SMC_USE_IOFUNCS
905 Define this to use i/o functions instead of macros
906 (some hardware wont work with macros)
909 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
911 CONFIG_FTGMAC100_EGIGA
912 Define this to use GE link update with gigabit PHY.
913 Define this if FTGMAC100 is connected to gigabit PHY.
914 If your system has 10/100 PHY only, it might not occur
915 wrong behavior. Because PHY usually return timeout or
916 useless data when polling gigabit status and gigabit
917 control registers. This behavior won't affect the
918 correctnessof 10/100 link speed update.
921 Support for SMSC's LAN911x and LAN921x chips
924 Define this to hold the physical address
925 of the device (I/O space)
927 CONFIG_SMC911X_32_BIT
928 Define this if data bus is 32 bits
930 CONFIG_SMC911X_16_BIT
931 Define this if data bus is 16 bits. If your processor
932 automatically converts one 32 bit word to two 16 bit
933 words you may also try CONFIG_SMC911X_32_BIT.
936 Support for Renesas on-chip Ethernet controller
938 CONFIG_SH_ETHER_USE_PORT
939 Define the number of ports to be used
941 CONFIG_SH_ETHER_PHY_ADDR
942 Define the ETH PHY's address
944 CONFIG_SH_ETHER_CACHE_WRITEBACK
945 If this option is set, the driver enables cache flush.
948 At the moment only the UHCI host controller is
949 supported (PIP405, MIP405, MPC5200); define
950 CONFIG_USB_UHCI to enable it.
951 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
952 and define CONFIG_USB_STORAGE to enable the USB
955 Supported are USB Keyboards and USB Floppy drives
957 MPC5200 USB requires additional defines:
959 for 528 MHz Clock: 0x0001bbbb
963 for differential drivers: 0x00001000
964 for single ended drivers: 0x00005000
965 for differential drivers on PSC3: 0x00000100
966 for single ended drivers on PSC3: 0x00004100
967 CONFIG_SYS_USB_EVENT_POLL
968 May be defined to allow interrupt polling
969 instead of using asynchronous interrupts
972 Define the below if you wish to use the USB console.
973 Once firmware is rebuilt from a serial console issue the
974 command "setenv stdin usbtty; setenv stdout usbtty" and
975 attach your USB cable. The Unix command "dmesg" should print
976 it has found a new device. The environment variable usbtty
977 can be set to gserial or cdc_acm to enable your device to
978 appear to a USB host as a Linux gserial device or a
979 Common Device Class Abstract Control Model serial device.
980 If you select usbtty = gserial you should be able to enumerate
982 # modprobe usbserial vendor=0xVendorID product=0xProductID
983 else if using cdc_acm, simply setting the environment
984 variable usbtty to be cdc_acm should suffice. The following
985 might be defined in YourBoardName.h
988 Define this to build a UDC device
991 Define this to have a tty type of device available to
992 talk to the UDC device
994 CONFIG_SYS_CONSOLE_IS_IN_ENV
995 Define this if you want stdin, stdout &/or stderr to
999 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
1000 Derive USB clock from external clock "blah"
1001 - CONFIG_SYS_USB_EXTC_CLK 0x02
1003 CONFIG_SYS_USB_BRG_CLK 0xBLAH
1004 Derive USB clock from brgclk
1005 - CONFIG_SYS_USB_BRG_CLK 0x04
1007 If you have a USB-IF assigned VendorID then you may wish to
1008 define your own vendor specific values either in BoardName.h
1009 or directly in usbd_vendor_info.h. If you don't define
1010 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
1011 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
1012 should pretend to be a Linux device to it's target host.
1014 CONFIG_USBD_MANUFACTURER
1015 Define this string as the name of your company for
1016 - CONFIG_USBD_MANUFACTURER "my company"
1018 CONFIG_USBD_PRODUCT_NAME
1019 Define this string as the name of your product
1020 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
1022 CONFIG_USBD_VENDORID
1023 Define this as your assigned Vendor ID from the USB
1024 Implementors Forum. This *must* be a genuine Vendor ID
1025 to avoid polluting the USB namespace.
1026 - CONFIG_USBD_VENDORID 0xFFFF
1028 CONFIG_USBD_PRODUCTID
1029 Define this as the unique Product ID
1031 - CONFIG_USBD_PRODUCTID 0xFFFF
1035 The MMC controller on the Intel PXA is supported. To
1036 enable this define CONFIG_MMC. The MMC can be
1037 accessed from the boot prompt by mapping the device
1038 to physical memory similar to flash. Command line is
1039 enabled with CONFIG_CMD_MMC. The MMC driver also works with
1040 the FAT fs. This is enabled with CONFIG_CMD_FAT.
1042 - Journaling Flash filesystem support:
1043 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
1044 CONFIG_JFFS2_NAND_DEV
1045 Define these for a default partition on a NAND device
1047 CONFIG_SYS_JFFS2_FIRST_SECTOR,
1048 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
1049 Define these for a default partition on a NOR device
1051 CONFIG_SYS_JFFS_CUSTOM_PART
1052 Define this to create an own partition. You have to provide a
1053 function struct part_info* jffs2_part_info(int part_num)
1055 If you define only one JFFS2 partition you may also want to
1056 #define CONFIG_SYS_JFFS_SINGLE_PART 1
1057 to disable the command chpart. This is the default when you
1058 have not defined a custom partition
1063 Define this to enable standard (PC-Style) keyboard
1067 Standard PC keyboard driver with US (is default) and
1068 GERMAN key layout (switch via environment 'keymap=de') support.
1069 Export function i8042_kbd_init, i8042_tstc and i8042_getc
1070 for cfb_console. Supports cursor blinking.
1075 Define this to enable video support (for output to
1078 CONFIG_VIDEO_CT69000
1080 Enable Chips & Technologies 69000 Video chip
1082 CONFIG_VIDEO_SMI_LYNXEM
1083 Enable Silicon Motion SMI 712/710/810 Video chip. The
1084 video output is selected via environment 'videoout'
1085 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1088 For the CT69000 and SMI_LYNXEM drivers, videomode is
1089 selected via environment 'videomode'. Two different ways
1091 - "videomode=num" 'num' is a standard LiLo mode numbers.
1092 Following standard modes are supported (* is default):
1094 Colors 640x480 800x600 1024x768 1152x864 1280x1024
1095 -------------+---------------------------------------------
1096 8 bits | 0x301* 0x303 0x305 0x161 0x307
1097 15 bits | 0x310 0x313 0x316 0x162 0x319
1098 16 bits | 0x311 0x314 0x317 0x163 0x31A
1099 24 bits | 0x312 0x315 0x318 ? 0x31B
1100 -------------+---------------------------------------------
1101 (i.e. setenv videomode 317; saveenv; reset;)
1103 - "videomode=bootargs" all the video parameters are parsed
1104 from the bootargs. (See drivers/video/videomodes.c)
1107 CONFIG_VIDEO_SED13806
1108 Enable Epson SED13806 driver. This driver supports 8bpp
1109 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1110 or CONFIG_VIDEO_SED13806_16BPP
1113 Enable the Freescale DIU video driver. Reference boards for
1114 SOCs that have a DIU should define this macro to enable DIU
1115 support, and should also define these other macros:
1121 CONFIG_VIDEO_SW_CURSOR
1122 CONFIG_VGA_AS_SINGLE_DEVICE
1124 CONFIG_VIDEO_BMP_LOGO
1126 The DIU driver will look for the 'video-mode' environment
1127 variable, and if defined, enable the DIU as a console during
1128 boot. See the documentation file README.video for a
1129 description of this variable.
1134 Define this to enable a custom keyboard support.
1135 This simply calls drv_keyboard_init() which must be
1136 defined in your board-specific files.
1137 The only board using this so far is RBC823.
1139 - LCD Support: CONFIG_LCD
1141 Define this to enable LCD support (for output to LCD
1142 display); also select one of the supported displays
1143 by defining one of these:
1147 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1149 CONFIG_NEC_NL6448AC33:
1151 NEC NL6448AC33-18. Active, color, single scan.
1153 CONFIG_NEC_NL6448BC20
1155 NEC NL6448BC20-08. 6.5", 640x480.
1156 Active, color, single scan.
1158 CONFIG_NEC_NL6448BC33_54
1160 NEC NL6448BC33-54. 10.4", 640x480.
1161 Active, color, single scan.
1165 Sharp 320x240. Active, color, single scan.
1166 It isn't 16x9, and I am not sure what it is.
1168 CONFIG_SHARP_LQ64D341
1170 Sharp LQ64D341 display, 640x480.
1171 Active, color, single scan.
1175 HLD1045 display, 640x480.
1176 Active, color, single scan.
1180 Optrex CBL50840-2 NF-FW 99 22 M5
1182 Hitachi LMG6912RPFC-00T
1186 320x240. Black & white.
1188 Normally display is black on white background; define
1189 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1191 - Splash Screen Support: CONFIG_SPLASH_SCREEN
1193 If this option is set, the environment is checked for
1194 a variable "splashimage". If found, the usual display
1195 of logo, copyright and system information on the LCD
1196 is suppressed and the BMP image at the address
1197 specified in "splashimage" is loaded instead. The
1198 console is redirected to the "nulldev", too. This
1199 allows for a "silent" boot where a splash screen is
1200 loaded very quickly after power-on.
1202 CONFIG_SPLASH_SCREEN_ALIGN
1204 If this option is set the splash image can be freely positioned
1205 on the screen. Environment variable "splashpos" specifies the
1206 position as "x,y". If a positive number is given it is used as
1207 number of pixel from left/top. If a negative number is given it
1208 is used as number of pixel from right/bottom. You can also
1209 specify 'm' for centering the image.
1212 setenv splashpos m,m
1213 => image at center of screen
1215 setenv splashpos 30,20
1216 => image at x = 30 and y = 20
1218 setenv splashpos -10,m
1219 => vertically centered image
1220 at x = dspWidth - bmpWidth - 9
1222 - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1224 If this option is set, additionally to standard BMP
1225 images, gzipped BMP images can be displayed via the
1226 splashscreen support or the bmp command.
1228 - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1230 If this option is set, 8-bit RLE compressed BMP images
1231 can be displayed via the splashscreen support or the
1234 - Compression support:
1237 If this option is set, support for bzip2 compressed
1238 images is included. If not, only uncompressed and gzip
1239 compressed images are supported.
1241 NOTE: the bzip2 algorithm requires a lot of RAM, so
1242 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1247 If this option is set, support for lzma compressed
1250 Note: The LZMA algorithm adds between 2 and 4KB of code and it
1251 requires an amount of dynamic memory that is given by the
1254 (1846 + 768 << (lc + lp)) * sizeof(uint16)
1256 Where lc and lp stand for, respectively, Literal context bits
1257 and Literal pos bits.
1259 This value is upper-bounded by 14MB in the worst case. Anyway,
1260 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1261 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1262 a very small buffer.
1264 Use the lzmainfo tool to determinate the lc and lp values and
1265 then calculate the amount of needed dynamic memory (ensuring
1266 the appropriate CONFIG_SYS_MALLOC_LEN value).
1271 The address of PHY on MII bus.
1273 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1275 The clock frequency of the MII bus
1279 If this option is set, support for speed/duplex
1280 detection of gigabit PHY is included.
1282 CONFIG_PHY_RESET_DELAY
1284 Some PHY like Intel LXT971A need extra delay after
1285 reset before any MII register access is possible.
1286 For such PHY, set this option to the usec delay
1287 required. (minimum 300usec for LXT971A)
1289 CONFIG_PHY_CMD_DELAY (ppc4xx)
1291 Some PHY like Intel LXT971A need extra delay after
1292 command issued before MII status register can be read
1302 Define a default value for Ethernet address to use
1303 for the respective Ethernet interface, in case this
1304 is not determined automatically.
1309 Define a default value for the IP address to use for
1310 the default Ethernet interface, in case this is not
1311 determined through e.g. bootp.
1313 - Server IP address:
1316 Defines a default value for the IP address of a TFTP
1317 server to contact when using the "tftboot" command.
1319 CONFIG_KEEP_SERVERADDR
1321 Keeps the server's MAC address, in the env 'serveraddr'
1322 for passing to bootargs (like Linux's netconsole option)
1324 - Multicast TFTP Mode:
1327 Defines whether you want to support multicast TFTP as per
1328 rfc-2090; for example to work with atftp. Lets lots of targets
1329 tftp down the same boot image concurrently. Note: the Ethernet
1330 driver in use must provide a function: mcast() to join/leave a
1333 - BOOTP Recovery Mode:
1334 CONFIG_BOOTP_RANDOM_DELAY
1336 If you have many targets in a network that try to
1337 boot using BOOTP, you may want to avoid that all
1338 systems send out BOOTP requests at precisely the same
1339 moment (which would happen for instance at recovery
1340 from a power failure, when all systems will try to
1341 boot, thus flooding the BOOTP server. Defining
1342 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1343 inserted before sending out BOOTP requests. The
1344 following delays are inserted then:
1346 1st BOOTP request: delay 0 ... 1 sec
1347 2nd BOOTP request: delay 0 ... 2 sec
1348 3rd BOOTP request: delay 0 ... 4 sec
1350 BOOTP requests: delay 0 ... 8 sec
1352 - DHCP Advanced Options:
1353 You can fine tune the DHCP functionality by defining
1354 CONFIG_BOOTP_* symbols:
1356 CONFIG_BOOTP_SUBNETMASK
1357 CONFIG_BOOTP_GATEWAY
1358 CONFIG_BOOTP_HOSTNAME
1359 CONFIG_BOOTP_NISDOMAIN
1360 CONFIG_BOOTP_BOOTPATH
1361 CONFIG_BOOTP_BOOTFILESIZE
1364 CONFIG_BOOTP_SEND_HOSTNAME
1365 CONFIG_BOOTP_NTPSERVER
1366 CONFIG_BOOTP_TIMEOFFSET
1367 CONFIG_BOOTP_VENDOREX
1369 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1370 environment variable, not the BOOTP server.
1372 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1373 serverip from a DHCP server, it is possible that more
1374 than one DNS serverip is offered to the client.
1375 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1376 serverip will be stored in the additional environment
1377 variable "dnsip2". The first DNS serverip is always
1378 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
1381 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1382 to do a dynamic update of a DNS server. To do this, they
1383 need the hostname of the DHCP requester.
1384 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
1385 of the "hostname" environment variable is passed as
1386 option 12 to the DHCP server.
1388 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1390 A 32bit value in microseconds for a delay between
1391 receiving a "DHCP Offer" and sending the "DHCP Request".
1392 This fixes a problem with certain DHCP servers that don't
1393 respond 100% of the time to a "DHCP request". E.g. On an
1394 AT91RM9200 processor running at 180MHz, this delay needed
1395 to be *at least* 15,000 usec before a Windows Server 2003
1396 DHCP server would reply 100% of the time. I recommend at
1397 least 50,000 usec to be safe. The alternative is to hope
1398 that one of the retries will be successful but note that
1399 the DHCP timeout and retry process takes a longer than
1403 CONFIG_CDP_DEVICE_ID
1405 The device id used in CDP trigger frames.
1407 CONFIG_CDP_DEVICE_ID_PREFIX
1409 A two character string which is prefixed to the MAC address
1414 A printf format string which contains the ascii name of
1415 the port. Normally is set to "eth%d" which sets
1416 eth0 for the first Ethernet, eth1 for the second etc.
1418 CONFIG_CDP_CAPABILITIES
1420 A 32bit integer which indicates the device capabilities;
1421 0x00000010 for a normal host which does not forwards.
1425 An ascii string containing the version of the software.
1429 An ascii string containing the name of the platform.
1433 A 32bit integer sent on the trigger.
1435 CONFIG_CDP_POWER_CONSUMPTION
1437 A 16bit integer containing the power consumption of the
1438 device in .1 of milliwatts.
1440 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1442 A byte containing the id of the VLAN.
1444 - Status LED: CONFIG_STATUS_LED
1446 Several configurations allow to display the current
1447 status using a LED. For instance, the LED will blink
1448 fast while running U-Boot code, stop blinking as
1449 soon as a reply to a BOOTP request was received, and
1450 start blinking slow once the Linux kernel is running
1451 (supported by a status LED driver in the Linux
1452 kernel). Defining CONFIG_STATUS_LED enables this
1455 - CAN Support: CONFIG_CAN_DRIVER
1457 Defining CONFIG_CAN_DRIVER enables CAN driver support
1458 on those systems that support this (optional)
1459 feature, like the TQM8xxL modules.
1461 - I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1463 These enable I2C serial bus commands. Defining either of
1464 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
1465 include the appropriate I2C driver for the selected CPU.
1467 This will allow you to use i2c commands at the u-boot
1468 command line (as long as you set CONFIG_CMD_I2C in
1469 CONFIG_COMMANDS) and communicate with i2c based realtime
1470 clock chips. See common/cmd_i2c.c for a description of the
1471 command line interface.
1473 CONFIG_HARD_I2C selects a hardware I2C controller.
1475 CONFIG_SOFT_I2C configures u-boot to use a software (aka
1476 bit-banging) driver instead of CPM or similar hardware
1479 There are several other quantities that must also be
1480 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1482 In both cases you will need to define CONFIG_SYS_I2C_SPEED
1483 to be the frequency (in Hz) at which you wish your i2c bus
1484 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
1485 the CPU's i2c node address).
1487 Now, the u-boot i2c code for the mpc8xx
1488 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
1489 and so its address should therefore be cleared to 0 (See,
1490 eg, MPC823e User's Manual p.16-473). So, set
1491 CONFIG_SYS_I2C_SLAVE to 0.
1493 CONFIG_SYS_I2C_INIT_MPC5XXX
1495 When a board is reset during an i2c bus transfer
1496 chips might think that the current transfer is still
1497 in progress. Reset the slave devices by sending start
1498 commands until the slave device responds.
1500 That's all that's required for CONFIG_HARD_I2C.
1502 If you use the software i2c interface (CONFIG_SOFT_I2C)
1503 then the following macros need to be defined (examples are
1504 from include/configs/lwmon.h):
1508 (Optional). Any commands necessary to enable the I2C
1509 controller or configure ports.
1511 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
1515 (Only for MPC8260 CPU). The I/O port to use (the code
1516 assumes both bits are on the same port). Valid values
1517 are 0..3 for ports A..D.
1521 The code necessary to make the I2C data line active
1522 (driven). If the data line is open collector, this
1525 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1529 The code necessary to make the I2C data line tri-stated
1530 (inactive). If the data line is open collector, this
1533 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1537 Code that returns TRUE if the I2C data line is high,
1540 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1544 If <bit> is TRUE, sets the I2C data line high. If it
1545 is FALSE, it clears it (low).
1547 eg: #define I2C_SDA(bit) \
1548 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
1549 else immr->im_cpm.cp_pbdat &= ~PB_SDA
1553 If <bit> is TRUE, sets the I2C clock line high. If it
1554 is FALSE, it clears it (low).
1556 eg: #define I2C_SCL(bit) \
1557 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
1558 else immr->im_cpm.cp_pbdat &= ~PB_SCL
1562 This delay is invoked four times per clock cycle so this
1563 controls the rate of data transfer. The data rate thus
1564 is 1 / (I2C_DELAY * 4). Often defined to be something
1567 #define I2C_DELAY udelay(2)
1569 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1571 If your arch supports the generic GPIO framework (asm/gpio.h),
1572 then you may alternatively define the two GPIOs that are to be
1573 used as SCL / SDA. Any of the previous I2C_xxx macros will
1574 have GPIO-based defaults assigned to them as appropriate.
1576 You should define these to the GPIO value as given directly to
1577 the generic GPIO functions.
1579 CONFIG_SYS_I2C_INIT_BOARD
1581 When a board is reset during an i2c bus transfer
1582 chips might think that the current transfer is still
1583 in progress. On some boards it is possible to access
1584 the i2c SCLK line directly, either by using the
1585 processor pin as a GPIO or by having a second pin
1586 connected to the bus. If this option is defined a
1587 custom i2c_init_board() routine in boards/xxx/board.c
1588 is run early in the boot sequence.
1590 CONFIG_SYS_I2C_BOARD_LATE_INIT
1592 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
1593 defined a custom i2c_board_late_init() routine in
1594 boards/xxx/board.c is run AFTER the operations in i2c_init()
1595 is completed. This callpoint can be used to unreset i2c bus
1596 using CPU i2c controller register accesses for CPUs whose i2c
1597 controller provide such a method. It is called at the end of
1598 i2c_init() to allow i2c_init operations to setup the i2c bus
1599 controller on the CPU (e.g. setting bus speed & slave address).
1601 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1603 This option enables configuration of bi_iic_fast[] flags
1604 in u-boot bd_info structure based on u-boot environment
1605 variable "i2cfast". (see also i2cfast)
1607 CONFIG_I2C_MULTI_BUS
1609 This option allows the use of multiple I2C buses, each of which
1610 must have a controller. At any point in time, only one bus is
1611 active. To switch to a different bus, use the 'i2c dev' command.
1612 Note that bus numbering is zero-based.
1614 CONFIG_SYS_I2C_NOPROBES
1616 This option specifies a list of I2C devices that will be skipped
1617 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
1618 is set, specify a list of bus-device pairs. Otherwise, specify
1619 a 1D array of device addresses
1622 #undef CONFIG_I2C_MULTI_BUS
1623 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1625 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1627 #define CONFIG_I2C_MULTI_BUS
1628 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
1630 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1632 CONFIG_SYS_SPD_BUS_NUM
1634 If defined, then this indicates the I2C bus number for DDR SPD.
1635 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1637 CONFIG_SYS_RTC_BUS_NUM
1639 If defined, then this indicates the I2C bus number for the RTC.
1640 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1642 CONFIG_SYS_DTT_BUS_NUM
1644 If defined, then this indicates the I2C bus number for the DTT.
1645 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1647 CONFIG_SYS_I2C_DTT_ADDR:
1649 If defined, specifies the I2C address of the DTT device.
1650 If not defined, then U-Boot uses predefined value for
1651 specified DTT device.
1655 Define this option if you want to use Freescale's I2C driver in
1656 drivers/i2c/fsl_i2c.c.
1660 Define this option if you have I2C devices reached over 1 .. n
1661 I2C Muxes like the pca9544a. This option addes a new I2C
1662 Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
1663 new I2C Bus to the existing I2C Busses. If you select the
1664 new Bus with "i2c dev", u-bbot sends first the commandos for
1665 the muxes to activate this new "bus".
1667 CONFIG_I2C_MULTI_BUS must be also defined, to use this
1671 Adding a new I2C Bus reached over 2 pca9544a muxes
1672 The First mux with address 70 and channel 6
1673 The Second mux with address 71 and channel 4
1675 => i2c bus pca9544a:70:6:pca9544a:71:4
1677 Use the "i2c bus" command without parameter, to get a list
1678 of I2C Busses with muxes:
1681 Busses reached over muxes:
1683 reached over Mux(es):
1686 reached over Mux(es):
1691 If you now switch to the new I2C Bus 3 with "i2c dev 3"
1692 u-boot sends First the Commando to the mux@70 to enable
1693 channel 6, and then the Commando to the mux@71 to enable
1696 After that, you can use the "normal" i2c commands as
1697 usual, to communicate with your I2C devices behind
1700 This option is actually implemented for the bitbanging
1701 algorithm in common/soft_i2c.c and for the Hardware I2C
1702 Bus on the MPC8260. But it should be not so difficult
1703 to add this option to other architectures.
1705 CONFIG_SOFT_I2C_READ_REPEATED_START
1707 defining this will force the i2c_read() function in
1708 the soft_i2c driver to perform an I2C repeated start
1709 between writing the address pointer and reading the
1710 data. If this define is omitted the default behaviour
1711 of doing a stop-start sequence will be used. Most I2C
1712 devices can use either method, but some require one or
1715 - SPI Support: CONFIG_SPI
1717 Enables SPI driver (so far only tested with
1718 SPI EEPROM, also an instance works with Crystal A/D and
1719 D/As on the SACSng board)
1723 Enables the driver for SPI controller on SuperH. Currently
1724 only SH7757 is supported.
1728 Enables extended (16-bit) SPI EEPROM addressing.
1729 (symmetrical to CONFIG_I2C_X)
1733 Enables a software (bit-bang) SPI driver rather than
1734 using hardware support. This is a general purpose
1735 driver that only requires three general I/O port pins
1736 (two outputs, one input) to function. If this is
1737 defined, the board configuration must define several
1738 SPI configuration items (port pins to use, etc). For
1739 an example, see include/configs/sacsng.h.
1743 Enables a hardware SPI driver for general-purpose reads
1744 and writes. As with CONFIG_SOFT_SPI, the board configuration
1745 must define a list of chip-select function pointers.
1746 Currently supported on some MPC8xxx processors. For an
1747 example, see include/configs/mpc8349emds.h.
1751 Enables the driver for the SPI controllers on i.MX and MXC
1752 SoCs. Currently only i.MX31 is supported.
1754 - FPGA Support: CONFIG_FPGA
1756 Enables FPGA subsystem.
1758 CONFIG_FPGA_<vendor>
1760 Enables support for specific chip vendors.
1763 CONFIG_FPGA_<family>
1765 Enables support for FPGA family.
1766 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1770 Specify the number of FPGA devices to support.
1772 CONFIG_SYS_FPGA_PROG_FEEDBACK
1774 Enable printing of hash marks during FPGA configuration.
1776 CONFIG_SYS_FPGA_CHECK_BUSY
1778 Enable checks on FPGA configuration interface busy
1779 status by the configuration function. This option
1780 will require a board or device specific function to
1785 If defined, a function that provides delays in the FPGA
1786 configuration driver.
1788 CONFIG_SYS_FPGA_CHECK_CTRLC
1789 Allow Control-C to interrupt FPGA configuration
1791 CONFIG_SYS_FPGA_CHECK_ERROR
1793 Check for configuration errors during FPGA bitfile
1794 loading. For example, abort during Virtex II
1795 configuration if the INIT_B line goes low (which
1796 indicated a CRC error).
1798 CONFIG_SYS_FPGA_WAIT_INIT
1800 Maximum time to wait for the INIT_B line to deassert
1801 after PROB_B has been deasserted during a Virtex II
1802 FPGA configuration sequence. The default time is 500
1805 CONFIG_SYS_FPGA_WAIT_BUSY
1807 Maximum time to wait for BUSY to deassert during
1808 Virtex II FPGA configuration. The default is 5 ms.
1810 CONFIG_SYS_FPGA_WAIT_CONFIG
1812 Time to wait after FPGA configuration. The default is
1815 - Configuration Management:
1818 If defined, this string will be added to the U-Boot
1819 version information (U_BOOT_VERSION)
1821 - Vendor Parameter Protection:
1823 U-Boot considers the values of the environment
1824 variables "serial#" (Board Serial Number) and
1825 "ethaddr" (Ethernet Address) to be parameters that
1826 are set once by the board vendor / manufacturer, and
1827 protects these variables from casual modification by
1828 the user. Once set, these variables are read-only,
1829 and write or delete attempts are rejected. You can
1830 change this behaviour:
1832 If CONFIG_ENV_OVERWRITE is #defined in your config
1833 file, the write protection for vendor parameters is
1834 completely disabled. Anybody can change or delete
1837 Alternatively, if you #define _both_ CONFIG_ETHADDR
1838 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1839 Ethernet address is installed in the environment,
1840 which can be changed exactly ONCE by the user. [The
1841 serial# is unaffected by this, i. e. it remains
1847 Define this variable to enable the reservation of
1848 "protected RAM", i. e. RAM which is not overwritten
1849 by U-Boot. Define CONFIG_PRAM to hold the number of
1850 kB you want to reserve for pRAM. You can overwrite
1851 this default value by defining an environment
1852 variable "pram" to the number of kB you want to
1853 reserve. Note that the board info structure will
1854 still show the full amount of RAM. If pRAM is
1855 reserved, a new environment variable "mem" will
1856 automatically be defined to hold the amount of
1857 remaining RAM in a form that can be passed as boot
1858 argument to Linux, for instance like that:
1860 setenv bootargs ... mem=\${mem}
1863 This way you can tell Linux not to use this memory,
1864 either, which results in a memory region that will
1865 not be affected by reboots.
1867 *WARNING* If your board configuration uses automatic
1868 detection of the RAM size, you must make sure that
1869 this memory test is non-destructive. So far, the
1870 following board configurations are known to be
1873 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1874 HERMES, IP860, RPXlite, LWMON, LANTEC,
1880 Define this variable to stop the system in case of a
1881 fatal error, so that you have to reset it manually.
1882 This is probably NOT a good idea for an embedded
1883 system where you want the system to reboot
1884 automatically as fast as possible, but it may be
1885 useful during development since you can try to debug
1886 the conditions that lead to the situation.
1888 CONFIG_NET_RETRY_COUNT
1890 This variable defines the number of retries for
1891 network operations like ARP, RARP, TFTP, or BOOTP
1892 before giving up the operation. If not defined, a
1893 default value of 5 is used.
1897 Timeout waiting for an ARP reply in milliseconds.
1899 - Command Interpreter:
1900 CONFIG_AUTO_COMPLETE
1902 Enable auto completion of commands using TAB.
1904 Note that this feature has NOT been implemented yet
1905 for the "hush" shell.
1908 CONFIG_SYS_HUSH_PARSER
1910 Define this variable to enable the "hush" shell (from
1911 Busybox) as command line interpreter, thus enabling
1912 powerful command line syntax like
1913 if...then...else...fi conditionals or `&&' and '||'
1914 constructs ("shell scripts").
1916 If undefined, you get the old, much simpler behaviour
1917 with a somewhat smaller memory footprint.
1920 CONFIG_SYS_PROMPT_HUSH_PS2
1922 This defines the secondary prompt string, which is
1923 printed when the command interpreter needs more input
1924 to complete a command. Usually "> ".
1928 In the current implementation, the local variables
1929 space and global environment variables space are
1930 separated. Local variables are those you define by
1931 simply typing `name=value'. To access a local
1932 variable later on, you have write `$name' or
1933 `${name}'; to execute the contents of a variable
1934 directly type `$name' at the command prompt.
1936 Global environment variables are those you use
1937 setenv/printenv to work with. To run a command stored
1938 in such a variable, you need to use the run command,
1939 and you must not use the '$' sign to access them.
1941 To store commands and special characters in a
1942 variable, please use double quotation marks
1943 surrounding the whole text of the variable, instead
1944 of the backslashes before semicolons and special
1947 - Commandline Editing and History:
1948 CONFIG_CMDLINE_EDITING
1950 Enable editing and History functions for interactive
1951 commandline input operations
1953 - Default Environment:
1954 CONFIG_EXTRA_ENV_SETTINGS
1956 Define this to contain any number of null terminated
1957 strings (variable = value pairs) that will be part of
1958 the default environment compiled into the boot image.
1960 For example, place something like this in your
1961 board's config file:
1963 #define CONFIG_EXTRA_ENV_SETTINGS \
1967 Warning: This method is based on knowledge about the
1968 internal format how the environment is stored by the
1969 U-Boot code. This is NOT an official, exported
1970 interface! Although it is unlikely that this format
1971 will change soon, there is no guarantee either.
1972 You better know what you are doing here.
1974 Note: overly (ab)use of the default environment is
1975 discouraged. Make sure to check other ways to preset
1976 the environment like the "source" command or the
1979 - DataFlash Support:
1980 CONFIG_HAS_DATAFLASH
1982 Defining this option enables DataFlash features and
1983 allows to read/write in Dataflash via the standard
1986 - SystemACE Support:
1989 Adding this option adds support for Xilinx SystemACE
1990 chips attached via some sort of local bus. The address
1991 of the chip must also be defined in the
1992 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
1994 #define CONFIG_SYSTEMACE
1995 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
1997 When SystemACE support is added, the "ace" device type
1998 becomes available to the fat commands, i.e. fatls.
2000 - TFTP Fixed UDP Port:
2003 If this is defined, the environment variable tftpsrcp
2004 is used to supply the TFTP UDP source port value.
2005 If tftpsrcp isn't defined, the normal pseudo-random port
2006 number generator is used.
2008 Also, the environment variable tftpdstp is used to supply
2009 the TFTP UDP destination port value. If tftpdstp isn't
2010 defined, the normal port 69 is used.
2012 The purpose for tftpsrcp is to allow a TFTP server to
2013 blindly start the TFTP transfer using the pre-configured
2014 target IP address and UDP port. This has the effect of
2015 "punching through" the (Windows XP) firewall, allowing
2016 the remainder of the TFTP transfer to proceed normally.
2017 A better solution is to properly configure the firewall,
2018 but sometimes that is not allowed.
2020 - Show boot progress:
2021 CONFIG_SHOW_BOOT_PROGRESS
2023 Defining this option allows to add some board-
2024 specific code (calling a user-provided function
2025 "show_boot_progress(int)") that enables you to show
2026 the system's boot progress on some display (for
2027 example, some LED's) on your board. At the moment,
2028 the following checkpoints are implemented:
2030 - Standalone program support:
2031 CONFIG_STANDALONE_LOAD_ADDR
2033 This option allows to define board specific values
2034 for the address where standalone program gets loaded,
2035 thus overwriting the architecutre dependent default
2038 - Frame Buffer Address:
2041 Define CONFIG_FB_ADDR if you want to use specific address for
2043 Then system will reserve the frame buffer address to defined address
2044 instead of lcd_setmem (this function grab the memory for frame buffer
2047 Please see board_init_f function.
2049 If you want this config option then,
2050 please define it at your board config file
2052 Legacy uImage format:
2055 1 common/cmd_bootm.c before attempting to boot an image
2056 -1 common/cmd_bootm.c Image header has bad magic number
2057 2 common/cmd_bootm.c Image header has correct magic number
2058 -2 common/cmd_bootm.c Image header has bad checksum
2059 3 common/cmd_bootm.c Image header has correct checksum
2060 -3 common/cmd_bootm.c Image data has bad checksum
2061 4 common/cmd_bootm.c Image data has correct checksum
2062 -4 common/cmd_bootm.c Image is for unsupported architecture
2063 5 common/cmd_bootm.c Architecture check OK
2064 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
2065 6 common/cmd_bootm.c Image Type check OK
2066 -6 common/cmd_bootm.c gunzip uncompression error
2067 -7 common/cmd_bootm.c Unimplemented compression type
2068 7 common/cmd_bootm.c Uncompression OK
2069 8 common/cmd_bootm.c No uncompress/copy overwrite error
2070 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
2072 9 common/image.c Start initial ramdisk verification
2073 -10 common/image.c Ramdisk header has bad magic number
2074 -11 common/image.c Ramdisk header has bad checksum
2075 10 common/image.c Ramdisk header is OK
2076 -12 common/image.c Ramdisk data has bad checksum
2077 11 common/image.c Ramdisk data has correct checksum
2078 12 common/image.c Ramdisk verification complete, start loading
2079 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
2080 13 common/image.c Start multifile image verification
2081 14 common/image.c No initial ramdisk, no multifile, continue.
2083 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2085 -30 arch/powerpc/lib/board.c Fatal error, hang the system
2086 -31 post/post.c POST test failed, detected by post_output_backlog()
2087 -32 post/post.c POST test failed, detected by post_run_single()
2089 34 common/cmd_doc.c before loading a Image from a DOC device
2090 -35 common/cmd_doc.c Bad usage of "doc" command
2091 35 common/cmd_doc.c correct usage of "doc" command
2092 -36 common/cmd_doc.c No boot device
2093 36 common/cmd_doc.c correct boot device
2094 -37 common/cmd_doc.c Unknown Chip ID on boot device
2095 37 common/cmd_doc.c correct chip ID found, device available
2096 -38 common/cmd_doc.c Read Error on boot device
2097 38 common/cmd_doc.c reading Image header from DOC device OK
2098 -39 common/cmd_doc.c Image header has bad magic number
2099 39 common/cmd_doc.c Image header has correct magic number
2100 -40 common/cmd_doc.c Error reading Image from DOC device
2101 40 common/cmd_doc.c Image header has correct magic number
2102 41 common/cmd_ide.c before loading a Image from a IDE device
2103 -42 common/cmd_ide.c Bad usage of "ide" command
2104 42 common/cmd_ide.c correct usage of "ide" command
2105 -43 common/cmd_ide.c No boot device
2106 43 common/cmd_ide.c boot device found
2107 -44 common/cmd_ide.c Device not available
2108 44 common/cmd_ide.c Device available
2109 -45 common/cmd_ide.c wrong partition selected
2110 45 common/cmd_ide.c partition selected
2111 -46 common/cmd_ide.c Unknown partition table
2112 46 common/cmd_ide.c valid partition table found
2113 -47 common/cmd_ide.c Invalid partition type
2114 47 common/cmd_ide.c correct partition type
2115 -48 common/cmd_ide.c Error reading Image Header on boot device
2116 48 common/cmd_ide.c reading Image Header from IDE device OK
2117 -49 common/cmd_ide.c Image header has bad magic number
2118 49 common/cmd_ide.c Image header has correct magic number
2119 -50 common/cmd_ide.c Image header has bad checksum
2120 50 common/cmd_ide.c Image header has correct checksum
2121 -51 common/cmd_ide.c Error reading Image from IDE device
2122 51 common/cmd_ide.c reading Image from IDE device OK
2123 52 common/cmd_nand.c before loading a Image from a NAND device
2124 -53 common/cmd_nand.c Bad usage of "nand" command
2125 53 common/cmd_nand.c correct usage of "nand" command
2126 -54 common/cmd_nand.c No boot device
2127 54 common/cmd_nand.c boot device found
2128 -55 common/cmd_nand.c Unknown Chip ID on boot device
2129 55 common/cmd_nand.c correct chip ID found, device available
2130 -56 common/cmd_nand.c Error reading Image Header on boot device
2131 56 common/cmd_nand.c reading Image Header from NAND device OK
2132 -57 common/cmd_nand.c Image header has bad magic number
2133 57 common/cmd_nand.c Image header has correct magic number
2134 -58 common/cmd_nand.c Error reading Image from NAND device
2135 58 common/cmd_nand.c reading Image from NAND device OK
2137 -60 common/env_common.c Environment has a bad CRC, using default
2139 64 net/eth.c starting with Ethernet configuration.
2140 -64 net/eth.c no Ethernet found.
2141 65 net/eth.c Ethernet found.
2143 -80 common/cmd_net.c usage wrong
2144 80 common/cmd_net.c before calling NetLoop()
2145 -81 common/cmd_net.c some error in NetLoop() occurred
2146 81 common/cmd_net.c NetLoop() back without error
2147 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
2148 82 common/cmd_net.c trying automatic boot
2149 83 common/cmd_net.c running "source" command
2150 -83 common/cmd_net.c some error in automatic boot or "source" command
2151 84 common/cmd_net.c end without errors
2156 100 common/cmd_bootm.c Kernel FIT Image has correct format
2157 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
2158 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
2159 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
2160 102 common/cmd_bootm.c Kernel unit name specified
2161 -103 common/cmd_bootm.c Can't get kernel subimage node offset
2162 103 common/cmd_bootm.c Found configuration node
2163 104 common/cmd_bootm.c Got kernel subimage node offset
2164 -104 common/cmd_bootm.c Kernel subimage hash verification failed
2165 105 common/cmd_bootm.c Kernel subimage hash verification OK
2166 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
2167 106 common/cmd_bootm.c Architecture check OK
2168 -106 common/cmd_bootm.c Kernel subimage has wrong type
2169 107 common/cmd_bootm.c Kernel subimage type OK
2170 -107 common/cmd_bootm.c Can't get kernel subimage data/size
2171 108 common/cmd_bootm.c Got kernel subimage data/size
2172 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
2173 -109 common/cmd_bootm.c Can't get kernel subimage type
2174 -110 common/cmd_bootm.c Can't get kernel subimage comp
2175 -111 common/cmd_bootm.c Can't get kernel subimage os
2176 -112 common/cmd_bootm.c Can't get kernel subimage load address
2177 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
2179 120 common/image.c Start initial ramdisk verification
2180 -120 common/image.c Ramdisk FIT image has incorrect format
2181 121 common/image.c Ramdisk FIT image has correct format
2182 122 common/image.c No ramdisk subimage unit name, using configuration
2183 -122 common/image.c Can't get configuration for ramdisk subimage
2184 123 common/image.c Ramdisk unit name specified
2185 -124 common/image.c Can't get ramdisk subimage node offset
2186 125 common/image.c Got ramdisk subimage node offset
2187 -125 common/image.c Ramdisk subimage hash verification failed
2188 126 common/image.c Ramdisk subimage hash verification OK
2189 -126 common/image.c Ramdisk subimage for unsupported architecture
2190 127 common/image.c Architecture check OK
2191 -127 common/image.c Can't get ramdisk subimage data/size
2192 128 common/image.c Got ramdisk subimage data/size
2193 129 common/image.c Can't get ramdisk load address
2194 -129 common/image.c Got ramdisk load address
2196 -130 common/cmd_doc.c Incorrect FIT image format
2197 131 common/cmd_doc.c FIT image format OK
2199 -140 common/cmd_ide.c Incorrect FIT image format
2200 141 common/cmd_ide.c FIT image format OK
2202 -150 common/cmd_nand.c Incorrect FIT image format
2203 151 common/cmd_nand.c FIT image format OK
2205 - Automatic software updates via TFTP server
2207 CONFIG_UPDATE_TFTP_CNT_MAX
2208 CONFIG_UPDATE_TFTP_MSEC_MAX
2210 These options enable and control the auto-update feature;
2211 for a more detailed description refer to doc/README.update.
2213 - MTD Support (mtdparts command, UBI support)
2216 Adds the MTD device infrastructure from the Linux kernel.
2217 Needed for mtdparts command support.
2219 CONFIG_MTD_PARTITIONS
2221 Adds the MTD partitioning infrastructure from the Linux
2222 kernel. Needed for UBI support.
2228 [so far only for SMDK2400 and TRAB boards]
2230 - Modem support enable:
2231 CONFIG_MODEM_SUPPORT
2233 - RTS/CTS Flow control enable:
2236 - Modem debug support:
2237 CONFIG_MODEM_SUPPORT_DEBUG
2239 Enables debugging stuff (char screen[1024], dbg())
2240 for modem support. Useful only with BDI2000.
2242 - Interrupt support (PPC):
2244 There are common interrupt_init() and timer_interrupt()
2245 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
2246 for CPU specific initialization. interrupt_init_cpu()
2247 should set decrementer_count to appropriate value. If
2248 CPU resets decrementer automatically after interrupt
2249 (ppc4xx) it should set decrementer_count to zero.
2250 timer_interrupt() calls timer_interrupt_cpu() for CPU
2251 specific handling. If board has watchdog / status_led
2252 / other_activity_monitor it works automatically from
2253 general timer_interrupt().
2257 In the target system modem support is enabled when a
2258 specific key (key combination) is pressed during
2259 power-on. Otherwise U-Boot will boot normally
2260 (autoboot). The key_pressed() function is called from
2261 board_init(). Currently key_pressed() is a dummy
2262 function, returning 1 and thus enabling modem
2265 If there are no modem init strings in the
2266 environment, U-Boot proceed to autoboot; the
2267 previous output (banner, info printfs) will be
2270 See also: doc/README.Modem
2273 Configuration Settings:
2274 -----------------------
2276 - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2277 undefine this when you're short of memory.
2279 - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
2280 width of the commands listed in the 'help' command output.
2282 - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
2283 prompt for user input.
2285 - CONFIG_SYS_CBSIZE: Buffer size for input from the Console
2287 - CONFIG_SYS_PBSIZE: Buffer size for Console output
2289 - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
2291 - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2292 the application (usually a Linux kernel) when it is
2295 - CONFIG_SYS_BAUDRATE_TABLE:
2296 List of legal baudrate settings for this board.
2298 - CONFIG_SYS_CONSOLE_INFO_QUIET
2299 Suppress display of console information at boot.
2301 - CONFIG_SYS_CONSOLE_IS_IN_ENV
2302 If the board specific function
2303 extern int overwrite_console (void);
2304 returns 1, the stdin, stderr and stdout are switched to the
2305 serial port, else the settings in the environment are used.
2307 - CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2308 Enable the call to overwrite_console().
2310 - CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2311 Enable overwrite of previous console environment settings.
2313 - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2314 Begin and End addresses of the area used by the
2317 - CONFIG_SYS_ALT_MEMTEST:
2318 Enable an alternate, more extensive memory test.
2320 - CONFIG_SYS_MEMTEST_SCRATCH:
2321 Scratch address used by the alternate memory test
2322 You only need to set this if address zero isn't writeable
2324 - CONFIG_SYS_MEM_TOP_HIDE (PPC only):
2325 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
2326 this specified memory area will get subtracted from the top
2327 (end) of RAM and won't get "touched" at all by U-Boot. By
2328 fixing up gd->ram_size the Linux kernel should gets passed
2329 the now "corrected" memory size and won't touch it either.
2330 This should work for arch/ppc and arch/powerpc. Only Linux
2331 board ports in arch/powerpc with bootwrapper support that
2332 recalculate the memory size from the SDRAM controller setup
2333 will have to get fixed in Linux additionally.
2335 This option can be used as a workaround for the 440EPx/GRx
2336 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
2339 WARNING: Please make sure that this value is a multiple of
2340 the Linux page size (normally 4k). If this is not the case,
2341 then the end address of the Linux memory will be located at a
2342 non page size aligned address and this could cause major
2345 - CONFIG_SYS_TFTP_LOADADDR:
2346 Default load address for network file downloads
2348 - CONFIG_SYS_LOADS_BAUD_CHANGE:
2349 Enable temporary baudrate change while serial download
2351 - CONFIG_SYS_SDRAM_BASE:
2352 Physical start address of SDRAM. _Must_ be 0 here.
2354 - CONFIG_SYS_MBIO_BASE:
2355 Physical start address of Motherboard I/O (if using a
2358 - CONFIG_SYS_FLASH_BASE:
2359 Physical start address of Flash memory.
2361 - CONFIG_SYS_MONITOR_BASE:
2362 Physical start address of boot monitor code (set by
2363 make config files to be same as the text base address
2364 (CONFIG_SYS_TEXT_BASE) used when linking) - same as
2365 CONFIG_SYS_FLASH_BASE when booting from flash.
2367 - CONFIG_SYS_MONITOR_LEN:
2368 Size of memory reserved for monitor code, used to
2369 determine _at_compile_time_ (!) if the environment is
2370 embedded within the U-Boot image, or in a separate
2373 - CONFIG_SYS_MALLOC_LEN:
2374 Size of DRAM reserved for malloc() use.
2376 - CONFIG_SYS_BOOTM_LEN:
2377 Normally compressed uImages are limited to an
2378 uncompressed size of 8 MBytes. If this is not enough,
2379 you can define CONFIG_SYS_BOOTM_LEN in your board config file
2380 to adjust this setting to your needs.
2382 - CONFIG_SYS_BOOTMAPSZ:
2383 Maximum size of memory mapped by the startup code of
2384 the Linux kernel; all data that must be processed by
2385 the Linux kernel (bd_info, boot arguments, FDT blob if
2386 used) must be put below this limit, unless "bootm_low"
2387 enviroment variable is defined and non-zero. In such case
2388 all data for the Linux kernel must be between "bootm_low"
2389 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
2390 variable "bootm_mapsize" will override the value of
2391 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
2392 then the value in "bootm_size" will be used instead.
2394 - CONFIG_SYS_BOOT_RAMDISK_HIGH:
2395 Enable initrd_high functionality. If defined then the
2396 initrd_high feature is enabled and the bootm ramdisk subcommand
2399 - CONFIG_SYS_BOOT_GET_CMDLINE:
2400 Enables allocating and saving kernel cmdline in space between
2401 "bootm_low" and "bootm_low" + BOOTMAPSZ.
2403 - CONFIG_SYS_BOOT_GET_KBD:
2404 Enables allocating and saving a kernel copy of the bd_info in
2405 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2407 - CONFIG_SYS_MAX_FLASH_BANKS:
2408 Max number of Flash memory banks
2410 - CONFIG_SYS_MAX_FLASH_SECT:
2411 Max number of sectors on a Flash chip
2413 - CONFIG_SYS_FLASH_ERASE_TOUT:
2414 Timeout for Flash erase operations (in ms)
2416 - CONFIG_SYS_FLASH_WRITE_TOUT:
2417 Timeout for Flash write operations (in ms)
2419 - CONFIG_SYS_FLASH_LOCK_TOUT
2420 Timeout for Flash set sector lock bit operation (in ms)
2422 - CONFIG_SYS_FLASH_UNLOCK_TOUT
2423 Timeout for Flash clear lock bits operation (in ms)
2425 - CONFIG_SYS_FLASH_PROTECTION
2426 If defined, hardware flash sectors protection is used
2427 instead of U-Boot software protection.
2429 - CONFIG_SYS_DIRECT_FLASH_TFTP:
2431 Enable TFTP transfers directly to flash memory;
2432 without this option such a download has to be
2433 performed in two steps: (1) download to RAM, and (2)
2434 copy from RAM to flash.
2436 The two-step approach is usually more reliable, since
2437 you can check if the download worked before you erase
2438 the flash, but in some situations (when system RAM is
2439 too limited to allow for a temporary copy of the
2440 downloaded image) this option may be very useful.
2442 - CONFIG_SYS_FLASH_CFI:
2443 Define if the flash driver uses extra elements in the
2444 common flash structure for storing flash geometry.
2446 - CONFIG_FLASH_CFI_DRIVER
2447 This option also enables the building of the cfi_flash driver
2448 in the drivers directory
2450 - CONFIG_FLASH_CFI_MTD
2451 This option enables the building of the cfi_mtd driver
2452 in the drivers directory. The driver exports CFI flash
2455 - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
2456 Use buffered writes to flash.
2458 - CONFIG_FLASH_SPANSION_S29WS_N
2459 s29ws-n MirrorBit flash has non-standard addresses for buffered
2462 - CONFIG_SYS_FLASH_QUIET_TEST
2463 If this option is defined, the common CFI flash doesn't
2464 print it's warning upon not recognized FLASH banks. This
2465 is useful, if some of the configured banks are only
2466 optionally available.
2468 - CONFIG_FLASH_SHOW_PROGRESS
2469 If defined (must be an integer), print out countdown
2470 digits and dots. Recommended value: 45 (9..1) for 80
2471 column displays, 15 (3..1) for 40 column displays.
2473 - CONFIG_SYS_RX_ETH_BUFFER:
2474 Defines the number of Ethernet receive buffers. On some
2475 Ethernet controllers it is recommended to set this value
2476 to 8 or even higher (EEPRO100 or 405 EMAC), since all
2477 buffers can be full shortly after enabling the interface
2478 on high Ethernet traffic.
2479 Defaults to 4 if not defined.
2481 - CONFIG_ENV_MAX_ENTRIES
2483 Maximum number of entries in the hash table that is used
2484 internally to store the environment settings. The default
2485 setting is supposed to be generous and should work in most
2486 cases. This setting can be used to tune behaviour; see
2487 lib/hashtable.c for details.
2489 The following definitions that deal with the placement and management
2490 of environment data (variable area); in general, we support the
2491 following configurations:
2493 - CONFIG_ENV_IS_IN_FLASH:
2495 Define this if the environment is in flash memory.
2497 a) The environment occupies one whole flash sector, which is
2498 "embedded" in the text segment with the U-Boot code. This
2499 happens usually with "bottom boot sector" or "top boot
2500 sector" type flash chips, which have several smaller
2501 sectors at the start or the end. For instance, such a
2502 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2503 such a case you would place the environment in one of the
2504 4 kB sectors - with U-Boot code before and after it. With
2505 "top boot sector" type flash chips, you would put the
2506 environment in one of the last sectors, leaving a gap
2507 between U-Boot and the environment.
2509 - CONFIG_ENV_OFFSET:
2511 Offset of environment data (variable area) to the
2512 beginning of flash memory; for instance, with bottom boot
2513 type flash chips the second sector can be used: the offset
2514 for this sector is given here.
2516 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2520 This is just another way to specify the start address of
2521 the flash sector containing the environment (instead of
2524 - CONFIG_ENV_SECT_SIZE:
2526 Size of the sector containing the environment.
2529 b) Sometimes flash chips have few, equal sized, BIG sectors.
2530 In such a case you don't want to spend a whole sector for
2535 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
2536 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2537 of this flash sector for the environment. This saves
2538 memory for the RAM copy of the environment.
2540 It may also save flash memory if you decide to use this
2541 when your environment is "embedded" within U-Boot code,
2542 since then the remainder of the flash sector could be used
2543 for U-Boot code. It should be pointed out that this is
2544 STRONGLY DISCOURAGED from a robustness point of view:
2545 updating the environment in flash makes it always
2546 necessary to erase the WHOLE sector. If something goes
2547 wrong before the contents has been restored from a copy in
2548 RAM, your target system will be dead.
2550 - CONFIG_ENV_ADDR_REDUND
2551 CONFIG_ENV_SIZE_REDUND
2553 These settings describe a second storage area used to hold
2554 a redundant copy of the environment data, so that there is
2555 a valid backup copy in case there is a power failure during
2556 a "saveenv" operation.
2558 BE CAREFUL! Any changes to the flash layout, and some changes to the
2559 source code will make it necessary to adapt <board>/u-boot.lds*
2563 - CONFIG_ENV_IS_IN_NVRAM:
2565 Define this if you have some non-volatile memory device
2566 (NVRAM, battery buffered SRAM) which you want to use for the
2572 These two #defines are used to determine the memory area you
2573 want to use for environment. It is assumed that this memory
2574 can just be read and written to, without any special
2577 BE CAREFUL! The first access to the environment happens quite early
2578 in U-Boot initalization (when we try to get the setting of for the
2579 console baudrate). You *MUST* have mapped your NVRAM area then, or
2582 Please note that even with NVRAM we still use a copy of the
2583 environment in RAM: we could work on NVRAM directly, but we want to
2584 keep settings there always unmodified except somebody uses "saveenv"
2585 to save the current settings.
2588 - CONFIG_ENV_IS_IN_EEPROM:
2590 Use this if you have an EEPROM or similar serial access
2591 device and a driver for it.
2593 - CONFIG_ENV_OFFSET:
2596 These two #defines specify the offset and size of the
2597 environment area within the total memory of your EEPROM.
2599 - CONFIG_SYS_I2C_EEPROM_ADDR:
2600 If defined, specified the chip address of the EEPROM device.
2601 The default address is zero.
2603 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2604 If defined, the number of bits used to address bytes in a
2605 single page in the EEPROM device. A 64 byte page, for example
2606 would require six bits.
2608 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2609 If defined, the number of milliseconds to delay between
2610 page writes. The default is zero milliseconds.
2612 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2613 The length in bytes of the EEPROM memory array address. Note
2614 that this is NOT the chip address length!
2616 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
2617 EEPROM chips that implement "address overflow" are ones
2618 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2619 address and the extra bits end up in the "chip address" bit
2620 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2623 Note that we consider the length of the address field to
2624 still be one byte because the extra address bits are hidden
2625 in the chip address.
2627 - CONFIG_SYS_EEPROM_SIZE:
2628 The size in bytes of the EEPROM device.
2630 - CONFIG_ENV_EEPROM_IS_ON_I2C
2631 define this, if you have I2C and SPI activated, and your
2632 EEPROM, which holds the environment, is on the I2C bus.
2634 - CONFIG_I2C_ENV_EEPROM_BUS
2635 if you have an Environment on an EEPROM reached over
2636 I2C muxes, you can define here, how to reach this
2637 EEPROM. For example:
2639 #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
2641 EEPROM which holds the environment, is reached over
2642 a pca9547 i2c mux with address 0x70, channel 3.
2644 - CONFIG_ENV_IS_IN_DATAFLASH:
2646 Define this if you have a DataFlash memory device which you
2647 want to use for the environment.
2649 - CONFIG_ENV_OFFSET:
2653 These three #defines specify the offset and size of the
2654 environment area within the total memory of your DataFlash placed
2655 at the specified address.
2657 - CONFIG_ENV_IS_IN_NAND:
2659 Define this if you have a NAND device which you want to use
2660 for the environment.
2662 - CONFIG_ENV_OFFSET:
2665 These two #defines specify the offset and size of the environment
2666 area within the first NAND device. CONFIG_ENV_OFFSET must be
2667 aligned to an erase block boundary.
2669 - CONFIG_ENV_OFFSET_REDUND (optional):
2671 This setting describes a second storage area of CONFIG_ENV_SIZE
2672 size used to hold a redundant copy of the environment data, so
2673 that there is a valid backup copy in case there is a power failure
2674 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
2675 aligned to an erase block boundary.
2677 - CONFIG_ENV_RANGE (optional):
2679 Specifies the length of the region in which the environment
2680 can be written. This should be a multiple of the NAND device's
2681 block size. Specifying a range with more erase blocks than
2682 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
2683 the range to be avoided.
2685 - CONFIG_ENV_OFFSET_OOB (optional):
2687 Enables support for dynamically retrieving the offset of the
2688 environment from block zero's out-of-band data. The
2689 "nand env.oob" command can be used to record this offset.
2690 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
2691 using CONFIG_ENV_OFFSET_OOB.
2693 - CONFIG_NAND_ENV_DST
2695 Defines address in RAM to which the nand_spl code should copy the
2696 environment. If redundant environment is used, it will be copied to
2697 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2699 - CONFIG_SYS_SPI_INIT_OFFSET
2701 Defines offset to the initial SPI buffer area in DPRAM. The
2702 area is used at an early stage (ROM part) if the environment
2703 is configured to reside in the SPI EEPROM: We need a 520 byte
2704 scratch DPRAM area. It is used between the two initialization
2705 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2706 to be a good choice since it makes it far enough from the
2707 start of the data area as well as from the stack pointer.
2709 Please note that the environment is read-only until the monitor
2710 has been relocated to RAM and a RAM copy of the environment has been
2711 created; also, when using EEPROM you will have to use getenv_f()
2712 until then to read environment variables.
2714 The environment is protected by a CRC32 checksum. Before the monitor
2715 is relocated into RAM, as a result of a bad CRC you will be working
2716 with the compiled-in default environment - *silently*!!! [This is
2717 necessary, because the first environment variable we need is the
2718 "baudrate" setting for the console - if we have a bad CRC, we don't
2719 have any device yet where we could complain.]
2721 Note: once the monitor has been relocated, then it will complain if
2722 the default environment is used; a new CRC is computed as soon as you
2723 use the "saveenv" command to store a valid environment.
2725 - CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
2726 Echo the inverted Ethernet link state to the fault LED.
2728 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
2729 also needs to be defined.
2731 - CONFIG_SYS_FAULT_MII_ADDR:
2732 MII address of the PHY to check for the Ethernet link state.
2734 - CONFIG_NS16550_MIN_FUNCTIONS:
2735 Define this if you desire to only have use of the NS16550_init
2736 and NS16550_putc functions for the serial driver located at
2737 drivers/serial/ns16550.c. This option is useful for saving
2738 space for already greatly restricted images, including but not
2739 limited to NAND_SPL configurations.
2741 Low Level (hardware related) configuration options:
2742 ---------------------------------------------------
2744 - CONFIG_SYS_CACHELINE_SIZE:
2745 Cache Line Size of the CPU.
2747 - CONFIG_SYS_DEFAULT_IMMR:
2748 Default address of the IMMR after system reset.
2750 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2751 and RPXsuper) to be able to adjust the position of
2752 the IMMR register after a reset.
2754 - Floppy Disk Support:
2755 CONFIG_SYS_FDC_DRIVE_NUMBER
2757 the default drive number (default value 0)
2759 CONFIG_SYS_ISA_IO_STRIDE
2761 defines the spacing between FDC chipset registers
2764 CONFIG_SYS_ISA_IO_OFFSET
2766 defines the offset of register from address. It
2767 depends on which part of the data bus is connected to
2768 the FDC chipset. (default value 0)
2770 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
2771 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
2774 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
2775 fdc_hw_init() is called at the beginning of the FDC
2776 setup. fdc_hw_init() must be provided by the board
2777 source code. It is used to make hardware dependant
2781 Most IDE controllers were designed to be connected with PCI
2782 interface. Only few of them were designed for AHB interface.
2783 When software is doing ATA command and data transfer to
2784 IDE devices through IDE-AHB controller, some additional
2785 registers accessing to these kind of IDE-AHB controller
2788 - CONFIG_SYS_IMMR: Physical address of the Internal Memory.
2789 DO NOT CHANGE unless you know exactly what you're
2790 doing! (11-4) [MPC8xx/82xx systems only]
2792 - CONFIG_SYS_INIT_RAM_ADDR:
2794 Start address of memory area that can be used for
2795 initial data and stack; please note that this must be
2796 writable memory that is working WITHOUT special
2797 initialization, i. e. you CANNOT use normal RAM which
2798 will become available only after programming the
2799 memory controller and running certain initialization
2802 U-Boot uses the following memory types:
2803 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2804 - MPC824X: data cache
2805 - PPC4xx: data cache
2807 - CONFIG_SYS_GBL_DATA_OFFSET:
2809 Offset of the initial data structure in the memory
2810 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
2811 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
2812 data is located at the end of the available space
2813 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
2814 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
2815 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
2816 CONFIG_SYS_GBL_DATA_OFFSET) downward.
2819 On the MPC824X (or other systems that use the data
2820 cache for initial memory) the address chosen for
2821 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
2822 point to an otherwise UNUSED address space between
2823 the top of RAM and the start of the PCI space.
2825 - CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
2827 - CONFIG_SYS_SYPCR: System Protection Control (11-9)
2829 - CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
2831 - CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
2833 - CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
2835 - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
2837 - CONFIG_SYS_OR_TIMING_SDRAM:
2840 - CONFIG_SYS_MAMR_PTA:
2841 periodic timer for refresh
2843 - CONFIG_SYS_DER: Debug Event Register (37-47)
2845 - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
2846 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
2847 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
2848 CONFIG_SYS_BR1_PRELIM:
2849 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2851 - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
2852 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
2853 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
2854 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2856 - CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
2857 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
2858 Machine Mode Register and Memory Periodic Timer
2859 Prescaler definitions (SDRAM timing)
2861 - CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
2862 enable I2C microcode relocation patch (MPC8xx);
2863 define relocation offset in DPRAM [DSP2]
2865 - CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
2866 enable SMC microcode relocation patch (MPC8xx);
2867 define relocation offset in DPRAM [SMC1]
2869 - CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
2870 enable SPI microcode relocation patch (MPC8xx);
2871 define relocation offset in DPRAM [SCC4]
2873 - CONFIG_SYS_USE_OSCCLK:
2874 Use OSCM clock mode on MBX8xx board. Be careful,
2875 wrong setting might damage your board. Read
2876 doc/README.MBX before setting this variable!
2878 - CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
2879 Offset of the bootmode word in DPRAM used by post
2880 (Power On Self Tests). This definition overrides
2881 #define'd default value in commproc.h resp.
2884 - CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
2885 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
2886 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
2887 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
2888 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
2889 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
2890 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
2891 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
2892 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
2894 - CONFIG_PCI_DISABLE_PCIE:
2895 Disable PCI-Express on systems where it is supported but not
2899 Chip has SRIO or not
2902 Board has SRIO 1 port available
2905 Board has SRIO 2 port available
2907 - CONFIG_SYS_SRIOn_MEM_VIRT:
2908 Virtual Address of SRIO port 'n' memory region
2910 - CONFIG_SYS_SRIOn_MEM_PHYS:
2911 Physical Address of SRIO port 'n' memory region
2913 - CONFIG_SYS_SRIOn_MEM_SIZE:
2914 Size of SRIO port 'n' memory region
2917 Get DDR timing information from an I2C EEPROM. Common
2918 with pluggable memory modules such as SODIMMs
2921 I2C address of the SPD EEPROM
2923 - CONFIG_SYS_SPD_BUS_NUM
2924 If SPD EEPROM is on an I2C bus other than the first
2925 one, specify here. Note that the value must resolve
2926 to something your driver can deal with.
2928 - CONFIG_SYS_83XX_DDR_USES_CS0
2929 Only for 83xx systems. If specified, then DDR should
2930 be configured using CS0 and CS1 instead of CS2 and CS3.
2932 - CONFIG_ETHER_ON_FEC[12]
2933 Define to enable FEC[12] on a 8xx series processor.
2935 - CONFIG_FEC[12]_PHY
2936 Define to the hardcoded PHY address which corresponds
2937 to the given FEC; i. e.
2938 #define CONFIG_FEC1_PHY 4
2939 means that the PHY with address 4 is connected to FEC1
2941 When set to -1, means to probe for first available.
2943 - CONFIG_FEC[12]_PHY_NORXERR
2944 The PHY does not have a RXERR line (RMII only).
2945 (so program the FEC to ignore it).
2948 Enable RMII mode for all FECs.
2949 Note that this is a global option, we can't
2950 have one FEC in standard MII mode and another in RMII mode.
2952 - CONFIG_CRC32_VERIFY
2953 Add a verify option to the crc32 command.
2956 => crc32 -v <address> <count> <crc32>
2958 Where address/count indicate a memory area
2959 and crc32 is the correct crc32 which the
2963 Add the "loopw" memory command. This only takes effect if
2964 the memory commands are activated globally (CONFIG_CMD_MEM).
2967 Add the "mdc" and "mwc" memory commands. These are cyclic
2972 This command will print 4 bytes (10,11,12,13) each 500 ms.
2974 => mwc.l 100 12345678 10
2975 This command will write 12345678 to address 100 all 10 ms.
2977 This only takes effect if the memory commands are activated
2978 globally (CONFIG_CMD_MEM).
2980 - CONFIG_SKIP_LOWLEVEL_INIT
2981 [ARM only] If this variable is defined, then certain
2982 low level initializations (like setting up the memory
2983 controller) are omitted and/or U-Boot does not
2984 relocate itself into RAM.
2986 Normally this variable MUST NOT be defined. The only
2987 exception is when U-Boot is loaded (to RAM) by some
2988 other boot loader or by a debugger which performs
2989 these initializations itself.
2992 Modifies the behaviour of start.S when compiling a loader
2993 that is executed before the actual U-Boot. E.g. when
2994 compiling a NAND SPL.
2996 - CONFIG_USE_ARCH_MEMCPY
2997 CONFIG_USE_ARCH_MEMSET
2998 If these options are used a optimized version of memcpy/memset will
2999 be used if available. These functions may be faster under some
3000 conditions but may increase the binary size.
3002 Building the Software:
3003 ======================
3005 Building U-Boot has been tested in several native build environments
3006 and in many different cross environments. Of course we cannot support
3007 all possibly existing versions of cross development tools in all
3008 (potentially obsolete) versions. In case of tool chain problems we
3009 recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3010 which is extensively used to build and test U-Boot.
3012 If you are not using a native environment, it is assumed that you
3013 have GNU cross compiling tools available in your path. In this case,
3014 you must set the environment variable CROSS_COMPILE in your shell.
3015 Note that no changes to the Makefile or any other source files are
3016 necessary. For example using the ELDK on a 4xx CPU, please enter:
3018 $ CROSS_COMPILE=ppc_4xx-
3019 $ export CROSS_COMPILE
3021 Note: If you wish to generate Windows versions of the utilities in
3022 the tools directory you can use the MinGW toolchain
3023 (http://www.mingw.org). Set your HOST tools to the MinGW
3024 toolchain and execute 'make tools'. For example:
3026 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
3028 Binaries such as tools/mkimage.exe will be created which can
3029 be executed on computers running Windows.
3031 U-Boot is intended to be simple to build. After installing the
3032 sources you must configure U-Boot for one specific board type. This
3037 where "NAME_config" is the name of one of the existing configu-
3038 rations; see the main Makefile for supported names.
3040 Note: for some board special configuration names may exist; check if
3041 additional information is available from the board vendor; for
3042 instance, the TQM823L systems are available without (standard)
3043 or with LCD support. You can select such additional "features"
3044 when choosing the configuration, i. e.
3047 - will configure for a plain TQM823L, i. e. no LCD support
3049 make TQM823L_LCD_config
3050 - will configure for a TQM823L with U-Boot console on LCD
3055 Finally, type "make all", and you should get some working U-Boot
3056 images ready for download to / installation on your system:
3058 - "u-boot.bin" is a raw binary image
3059 - "u-boot" is an image in ELF binary format
3060 - "u-boot.srec" is in Motorola S-Record format
3062 By default the build is performed locally and the objects are saved
3063 in the source directory. One of the two methods can be used to change
3064 this behavior and build U-Boot to some external directory:
3066 1. Add O= to the make command line invocations:
3068 make O=/tmp/build distclean
3069 make O=/tmp/build NAME_config
3070 make O=/tmp/build all
3072 2. Set environment variable BUILD_DIR to point to the desired location:
3074 export BUILD_DIR=/tmp/build
3079 Note that the command line "O=" setting overrides the BUILD_DIR environment
3083 Please be aware that the Makefiles assume you are using GNU make, so
3084 for instance on NetBSD you might need to use "gmake" instead of
3088 If the system board that you have is not listed, then you will need
3089 to port U-Boot to your hardware platform. To do this, follow these
3092 1. Add a new configuration option for your board to the toplevel
3093 "Makefile" and to the "MAKEALL" script, using the existing
3094 entries as examples. Note that here and at many other places
3095 boards and other names are listed in alphabetical sort order. Please
3097 2. Create a new directory to hold your board specific code. Add any
3098 files you need. In your board directory, you will need at least
3099 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
3100 3. Create a new configuration file "include/configs/<board>.h" for
3102 3. If you're porting U-Boot to a new CPU, then also create a new
3103 directory to hold your CPU specific code. Add any files you need.
3104 4. Run "make <board>_config" with your new name.
3105 5. Type "make", and you should get a working "u-boot.srec" file
3106 to be installed on your target system.
3107 6. Debug and solve any problems that might arise.
3108 [Of course, this last step is much harder than it sounds.]
3111 Testing of U-Boot Modifications, Ports to New Hardware, etc.:
3112 ==============================================================
3114 If you have modified U-Boot sources (for instance added a new board
3115 or support for new devices, a new CPU, etc.) you are expected to
3116 provide feedback to the other developers. The feedback normally takes
3117 the form of a "patch", i. e. a context diff against a certain (latest
3118 official or latest in the git repository) version of U-Boot sources.
3120 But before you submit such a patch, please verify that your modifi-
3121 cation did not break existing code. At least make sure that *ALL* of
3122 the supported boards compile WITHOUT ANY compiler warnings. To do so,
3123 just run the "MAKEALL" script, which will configure and build U-Boot
3124 for ALL supported system. Be warned, this will take a while. You can
3125 select which (cross) compiler to use by passing a `CROSS_COMPILE'
3126 environment variable to the script, i. e. to use the ELDK cross tools
3129 CROSS_COMPILE=ppc_8xx- MAKEALL
3131 or to build on a native PowerPC system you can type
3133 CROSS_COMPILE=' ' MAKEALL
3135 When using the MAKEALL script, the default behaviour is to build
3136 U-Boot in the source directory. This location can be changed by
3137 setting the BUILD_DIR environment variable. Also, for each target
3138 built, the MAKEALL script saves two log files (<target>.ERR and
3139 <target>.MAKEALL) in the <source dir>/LOG directory. This default
3140 location can be changed by setting the MAKEALL_LOGDIR environment
3141 variable. For example:
3143 export BUILD_DIR=/tmp/build
3144 export MAKEALL_LOGDIR=/tmp/log
3145 CROSS_COMPILE=ppc_8xx- MAKEALL
3147 With the above settings build objects are saved in the /tmp/build,
3148 log files are saved in the /tmp/log and the source tree remains clean
3149 during the whole build process.
3152 See also "U-Boot Porting Guide" below.
3155 Monitor Commands - Overview:
3156 ============================
3158 go - start application at address 'addr'
3159 run - run commands in an environment variable
3160 bootm - boot application image from memory
3161 bootp - boot image via network using BootP/TFTP protocol
3162 tftpboot- boot image via network using TFTP protocol
3163 and env variables "ipaddr" and "serverip"
3164 (and eventually "gatewayip")
3165 rarpboot- boot image via network using RARP/TFTP protocol
3166 diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
3167 loads - load S-Record file over serial line
3168 loadb - load binary file over serial line (kermit mode)
3170 mm - memory modify (auto-incrementing)
3171 nm - memory modify (constant address)
3172 mw - memory write (fill)
3174 cmp - memory compare
3175 crc32 - checksum calculation
3176 i2c - I2C sub-system
3177 sspi - SPI utility commands
3178 base - print or set address offset
3179 printenv- print environment variables
3180 setenv - set environment variables
3181 saveenv - save environment variables to persistent storage
3182 protect - enable or disable FLASH write protection
3183 erase - erase FLASH memory
3184 flinfo - print FLASH memory information
3185 bdinfo - print Board Info structure
3186 iminfo - print header information for application image
3187 coninfo - print console devices and informations
3188 ide - IDE sub-system
3189 loop - infinite loop on address range
3190 loopw - infinite write loop on address range
3191 mtest - simple RAM test
3192 icache - enable or disable instruction cache
3193 dcache - enable or disable data cache
3194 reset - Perform RESET of the CPU
3195 echo - echo args to console
3196 version - print monitor version
3197 help - print online help
3198 ? - alias for 'help'
3201 Monitor Commands - Detailed Description:
3202 ========================================
3206 For now: just type "help <command>".
3209 Environment Variables:
3210 ======================
3212 U-Boot supports user configuration using Environment Variables which
3213 can be made persistent by saving to Flash memory.
3215 Environment Variables are set using "setenv", printed using
3216 "printenv", and saved to Flash using "saveenv". Using "setenv"
3217 without a value can be used to delete a variable from the
3218 environment. As long as you don't save the environment you are
3219 working with an in-memory copy. In case the Flash area containing the
3220 environment is erased by accident, a default environment is provided.
3222 Some configuration options can be set using Environment Variables.
3224 List of environment variables (most likely not complete):
3226 baudrate - see CONFIG_BAUDRATE
3228 bootdelay - see CONFIG_BOOTDELAY
3230 bootcmd - see CONFIG_BOOTCOMMAND
3232 bootargs - Boot arguments when booting an RTOS image
3234 bootfile - Name of the image to load with TFTP
3236 bootm_low - Memory range available for image processing in the bootm
3237 command can be restricted. This variable is given as
3238 a hexadecimal number and defines lowest address allowed
3239 for use by the bootm command. See also "bootm_size"
3240 environment variable. Address defined by "bootm_low" is
3241 also the base of the initial memory mapping for the Linux
3242 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3245 bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3246 This variable is given as a hexadecimal number and it
3247 defines the size of the memory region starting at base
3248 address bootm_low that is accessible by the Linux kernel
3249 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
3250 as the default value if it is defined, and bootm_size is
3253 bootm_size - Memory range available for image processing in the bootm
3254 command can be restricted. This variable is given as
3255 a hexadecimal number and defines the size of the region
3256 allowed for use by the bootm command. See also "bootm_low"
3257 environment variable.
3259 updatefile - Location of the software update file on a TFTP server, used
3260 by the automatic software update feature. Please refer to
3261 documentation in doc/README.update for more details.
3263 autoload - if set to "no" (any string beginning with 'n'),
3264 "bootp" will just load perform a lookup of the
3265 configuration from the BOOTP server, but not try to
3266 load any image using TFTP
3268 autostart - if set to "yes", an image loaded using the "bootp",
3269 "rarpboot", "tftpboot" or "diskboot" commands will
3270 be automatically started (by internally calling
3273 If set to "no", a standalone image passed to the
3274 "bootm" command will be copied to the load address
3275 (and eventually uncompressed), but NOT be started.
3276 This can be used to load and uncompress arbitrary
3279 i2cfast - (PPC405GP|PPC405EP only)
3280 if set to 'y' configures Linux I2C driver for fast
3281 mode (400kHZ). This environment variable is used in
3282 initialization code. So, for changes to be effective
3283 it must be saved and board must be reset.
3285 initrd_high - restrict positioning of initrd images:
3286 If this variable is not set, initrd images will be
3287 copied to the highest possible address in RAM; this
3288 is usually what you want since it allows for
3289 maximum initrd size. If for some reason you want to
3290 make sure that the initrd image is loaded below the
3291 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3292 variable to a value of "no" or "off" or "0".
3293 Alternatively, you can set it to a maximum upper
3294 address to use (U-Boot will still check that it
3295 does not overwrite the U-Boot stack and data).
3297 For instance, when you have a system with 16 MB
3298 RAM, and want to reserve 4 MB from use by Linux,
3299 you can do this by adding "mem=12M" to the value of
3300 the "bootargs" variable. However, now you must make
3301 sure that the initrd image is placed in the first
3302 12 MB as well - this can be done with
3304 setenv initrd_high 00c00000
3306 If you set initrd_high to 0xFFFFFFFF, this is an
3307 indication to U-Boot that all addresses are legal
3308 for the Linux kernel, including addresses in flash
3309 memory. In this case U-Boot will NOT COPY the
3310 ramdisk at all. This may be useful to reduce the
3311 boot time on your system, but requires that this
3312 feature is supported by your Linux kernel.
3314 ipaddr - IP address; needed for tftpboot command
3316 loadaddr - Default load address for commands like "bootp",
3317 "rarpboot", "tftpboot", "loadb" or "diskboot"
3319 loads_echo - see CONFIG_LOADS_ECHO
3321 serverip - TFTP server IP address; needed for tftpboot command
3323 bootretry - see CONFIG_BOOT_RETRY_TIME
3325 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
3327 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
3329 ethprime - When CONFIG_NET_MULTI is enabled controls which
3330 interface is used first.
3332 ethact - When CONFIG_NET_MULTI is enabled controls which
3333 interface is currently active. For example you
3334 can do the following
3336 => setenv ethact FEC
3337 => ping 192.168.0.1 # traffic sent on FEC
3338 => setenv ethact SCC
3339 => ping 10.0.0.1 # traffic sent on SCC
3341 ethrotate - When set to "no" U-Boot does not go through all
3342 available network interfaces.
3343 It just stays at the currently selected interface.
3345 netretry - When set to "no" each network operation will
3346 either succeed or fail without retrying.
3347 When set to "once" the network operation will
3348 fail when all the available network interfaces
3349 are tried once without success.
3350 Useful on scripts which control the retry operation
3353 npe_ucode - set load address for the NPE microcode
3355 tftpsrcport - If this is set, the value is used for TFTP's
3358 tftpdstport - If this is set, the value is used for TFTP's UDP
3359 destination port instead of the Well Know Port 69.
3361 tftpblocksize - Block size to use for TFTP transfers; if not set,
3362 we use the TFTP server's default block size
3364 tftptimeout - Retransmission timeout for TFTP packets (in milli-
3365 seconds, minimum value is 1000 = 1 second). Defines
3366 when a packet is considered to be lost so it has to
3367 be retransmitted. The default is 5000 = 5 seconds.
3368 Lowering this value may make downloads succeed
3369 faster in networks with high packet loss rates or
3370 with unreliable TFTP servers.
3372 vlan - When set to a value < 4095 the traffic over
3373 Ethernet is encapsulated/received over 802.1q
3376 The following environment variables may be used and automatically
3377 updated by the network boot commands ("bootp" and "rarpboot"),
3378 depending the information provided by your boot server:
3380 bootfile - see above
3381 dnsip - IP address of your Domain Name Server
3382 dnsip2 - IP address of your secondary Domain Name Server
3383 gatewayip - IP address of the Gateway (Router) to use
3384 hostname - Target hostname
3386 netmask - Subnet Mask
3387 rootpath - Pathname of the root filesystem on the NFS server
3388 serverip - see above
3391 There are two special Environment Variables:
3393 serial# - contains hardware identification information such
3394 as type string and/or serial number
3395 ethaddr - Ethernet address
3397 These variables can be set only once (usually during manufacturing of
3398 the board). U-Boot refuses to delete or overwrite these variables
3399 once they have been set once.
3402 Further special Environment Variables:
3404 ver - Contains the U-Boot version string as printed
3405 with the "version" command. This variable is
3406 readonly (see CONFIG_VERSION_VARIABLE).
3409 Please note that changes to some configuration parameters may take
3410 only effect after the next boot (yes, that's just like Windoze :-).
3413 Command Line Parsing:
3414 =====================
3416 There are two different command line parsers available with U-Boot:
3417 the old "simple" one, and the much more powerful "hush" shell:
3419 Old, simple command line parser:
3420 --------------------------------
3422 - supports environment variables (through setenv / saveenv commands)
3423 - several commands on one line, separated by ';'
3424 - variable substitution using "... ${name} ..." syntax
3425 - special characters ('$', ';') can be escaped by prefixing with '\',
3427 setenv bootcmd bootm \${address}
3428 - You can also escape text by enclosing in single apostrophes, for example:
3429 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3434 - similar to Bourne shell, with control structures like
3435 if...then...else...fi, for...do...done; while...do...done,
3436 until...do...done, ...
3437 - supports environment ("global") variables (through setenv / saveenv
3438 commands) and local shell variables (through standard shell syntax
3439 "name=value"); only environment variables can be used with "run"
3445 (1) If a command line (or an environment variable executed by a "run"
3446 command) contains several commands separated by semicolon, and
3447 one of these commands fails, then the remaining commands will be
3450 (2) If you execute several variables with one call to run (i. e.
3451 calling run with a list of variables as arguments), any failing
3452 command will cause "run" to terminate, i. e. the remaining
3453 variables are not executed.
3455 Note for Redundant Ethernet Interfaces:
3456 =======================================
3458 Some boards come with redundant Ethernet interfaces; U-Boot supports
3459 such configurations and is capable of automatic selection of a
3460 "working" interface when needed. MAC assignment works as follows:
3462 Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
3463 MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3464 "eth1addr" (=>eth1), "eth2addr", ...
3466 If the network interface stores some valid MAC address (for instance
3467 in SROM), this is used as default address if there is NO correspon-
3468 ding setting in the environment; if the corresponding environment
3469 variable is set, this overrides the settings in the card; that means:
3471 o If the SROM has a valid MAC address, and there is no address in the
3472 environment, the SROM's address is used.
3474 o If there is no valid address in the SROM, and a definition in the
3475 environment exists, then the value from the environment variable is
3478 o If both the SROM and the environment contain a MAC address, and
3479 both addresses are the same, this MAC address is used.
3481 o If both the SROM and the environment contain a MAC address, and the
3482 addresses differ, the value from the environment is used and a
3485 o If neither SROM nor the environment contain a MAC address, an error
3488 If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3489 will be programmed into hardware as part of the initialization process. This
3490 may be skipped by setting the appropriate 'ethmacskip' environment variable.
3491 The naming convention is as follows:
3492 "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3497 U-Boot is capable of booting (and performing other auxiliary operations on)
3498 images in two formats:
3500 New uImage format (FIT)
3501 -----------------------
3503 Flexible and powerful format based on Flattened Image Tree -- FIT (similar
3504 to Flattened Device Tree). It allows the use of images with multiple
3505 components (several kernels, ramdisks, etc.), with contents protected by
3506 SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
3512 Old image format is based on binary files which can be basically anything,
3513 preceded by a special header; see the definitions in include/image.h for
3514 details; basically, the header defines the following image properties:
3516 * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3517 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3518 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3519 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3521 * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
3522 IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
3523 Currently supported: ARM, AVR32, Intel x86, MIPS, Nios II, PowerPC).
3524 * Compression Type (uncompressed, gzip, bzip2)
3530 The header is marked by a special Magic Number, and both the header
3531 and the data portions of the image are secured against corruption by
3538 Although U-Boot should support any OS or standalone application
3539 easily, the main focus has always been on Linux during the design of
3542 U-Boot includes many features that so far have been part of some
3543 special "boot loader" code within the Linux kernel. Also, any
3544 "initrd" images to be used are no longer part of one big Linux image;
3545 instead, kernel and "initrd" are separate images. This implementation
3546 serves several purposes:
3548 - the same features can be used for other OS or standalone
3549 applications (for instance: using compressed images to reduce the
3550 Flash memory footprint)
3552 - it becomes much easier to port new Linux kernel versions because
3553 lots of low-level, hardware dependent stuff are done by U-Boot
3555 - the same Linux kernel image can now be used with different "initrd"
3556 images; of course this also means that different kernel images can
3557 be run with the same "initrd". This makes testing easier (you don't
3558 have to build a new "zImage.initrd" Linux image when you just
3559 change a file in your "initrd"). Also, a field-upgrade of the
3560 software is easier now.
3566 Porting Linux to U-Boot based systems:
3567 ---------------------------------------
3569 U-Boot cannot save you from doing all the necessary modifications to
3570 configure the Linux device drivers for use with your target hardware
3571 (no, we don't intend to provide a full virtual machine interface to
3574 But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
3576 Just make sure your machine specific header file (for instance
3577 include/asm-ppc/tqm8xx.h) includes the same definition of the Board
3578 Information structure as we define in include/asm-<arch>/u-boot.h,
3579 and make sure that your definition of IMAP_ADDR uses the same value
3580 as your U-Boot configuration in CONFIG_SYS_IMMR.
3583 Configuring the Linux kernel:
3584 -----------------------------
3586 No specific requirements for U-Boot. Make sure you have some root
3587 device (initial ramdisk, NFS) for your target system.
3590 Building a Linux Image:
3591 -----------------------
3593 With U-Boot, "normal" build targets like "zImage" or "bzImage" are
3594 not used. If you use recent kernel source, a new build target
3595 "uImage" will exist which automatically builds an image usable by
3596 U-Boot. Most older kernels also have support for a "pImage" target,
3597 which was introduced for our predecessor project PPCBoot and uses a
3598 100% compatible format.
3607 The "uImage" build target uses a special tool (in 'tools/mkimage') to
3608 encapsulate a compressed Linux kernel image with header information,
3609 CRC32 checksum etc. for use with U-Boot. This is what we are doing:
3611 * build a standard "vmlinux" kernel image (in ELF binary format):
3613 * convert the kernel into a raw binary image:
3615 ${CROSS_COMPILE}-objcopy -O binary \
3616 -R .note -R .comment \
3617 -S vmlinux linux.bin
3619 * compress the binary image:
3623 * package compressed binary image for U-Boot:
3625 mkimage -A ppc -O linux -T kernel -C gzip \
3626 -a 0 -e 0 -n "Linux Kernel Image" \
3627 -d linux.bin.gz uImage
3630 The "mkimage" tool can also be used to create ramdisk images for use
3631 with U-Boot, either separated from the Linux kernel image, or
3632 combined into one file. "mkimage" encapsulates the images with a 64
3633 byte header containing information about target architecture,
3634 operating system, image type, compression method, entry points, time
3635 stamp, CRC32 checksums, etc.
3637 "mkimage" can be called in two ways: to verify existing images and
3638 print the header information, or to build new images.
3640 In the first form (with "-l" option) mkimage lists the information
3641 contained in the header of an existing U-Boot image; this includes
3642 checksum verification:
3644 tools/mkimage -l image
3645 -l ==> list image header information
3647 The second form (with "-d" option) is used to build a U-Boot image
3648 from a "data file" which is used as image payload:
3650 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3651 -n name -d data_file image
3652 -A ==> set architecture to 'arch'
3653 -O ==> set operating system to 'os'
3654 -T ==> set image type to 'type'
3655 -C ==> set compression type 'comp'
3656 -a ==> set load address to 'addr' (hex)
3657 -e ==> set entry point to 'ep' (hex)
3658 -n ==> set image name to 'name'
3659 -d ==> use image data from 'datafile'
3661 Right now, all Linux kernels for PowerPC systems use the same load
3662 address (0x00000000), but the entry point address depends on the
3665 - 2.2.x kernels have the entry point at 0x0000000C,
3666 - 2.3.x and later kernels have the entry point at 0x00000000.
3668 So a typical call to build a U-Boot image would read:
3670 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3671 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3672 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
3673 > examples/uImage.TQM850L
3674 Image Name: 2.4.4 kernel for TQM850L
3675 Created: Wed Jul 19 02:34:59 2000
3676 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3677 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3678 Load Address: 0x00000000
3679 Entry Point: 0x00000000
3681 To verify the contents of the image (or check for corruption):
3683 -> tools/mkimage -l examples/uImage.TQM850L
3684 Image Name: 2.4.4 kernel for TQM850L
3685 Created: Wed Jul 19 02:34:59 2000
3686 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3687 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3688 Load Address: 0x00000000
3689 Entry Point: 0x00000000
3691 NOTE: for embedded systems where boot time is critical you can trade
3692 speed for memory and install an UNCOMPRESSED image instead: this
3693 needs more space in Flash, but boots much faster since it does not
3694 need to be uncompressed:
3696 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
3697 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3698 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3699 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
3700 > examples/uImage.TQM850L-uncompressed
3701 Image Name: 2.4.4 kernel for TQM850L
3702 Created: Wed Jul 19 02:34:59 2000
3703 Image Type: PowerPC Linux Kernel Image (uncompressed)
3704 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3705 Load Address: 0x00000000
3706 Entry Point: 0x00000000
3709 Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3710 when your kernel is intended to use an initial ramdisk:
3712 -> tools/mkimage -n 'Simple Ramdisk Image' \
3713 > -A ppc -O linux -T ramdisk -C gzip \
3714 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3715 Image Name: Simple Ramdisk Image
3716 Created: Wed Jan 12 14:01:50 2000
3717 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3718 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3719 Load Address: 0x00000000
3720 Entry Point: 0x00000000
3723 Installing a Linux Image:
3724 -------------------------
3726 To downloading a U-Boot image over the serial (console) interface,
3727 you must convert the image to S-Record format:
3729 objcopy -I binary -O srec examples/image examples/image.srec
3731 The 'objcopy' does not understand the information in the U-Boot
3732 image header, so the resulting S-Record file will be relative to
3733 address 0x00000000. To load it to a given address, you need to
3734 specify the target address as 'offset' parameter with the 'loads'
3737 Example: install the image to address 0x40100000 (which on the
3738 TQM8xxL is in the first Flash bank):
3740 => erase 40100000 401FFFFF
3746 ## Ready for S-Record download ...
3747 ~>examples/image.srec
3748 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3750 15989 15990 15991 15992
3751 [file transfer complete]
3753 ## Start Addr = 0x00000000
3756 You can check the success of the download using the 'iminfo' command;
3757 this includes a checksum verification so you can be sure no data
3758 corruption happened:
3762 ## Checking Image at 40100000 ...
3763 Image Name: 2.2.13 for initrd on TQM850L
3764 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3765 Data Size: 335725 Bytes = 327 kB = 0 MB
3766 Load Address: 00000000
3767 Entry Point: 0000000c
3768 Verifying Checksum ... OK
3774 The "bootm" command is used to boot an application that is stored in
3775 memory (RAM or Flash). In case of a Linux kernel image, the contents
3776 of the "bootargs" environment variable is passed to the kernel as
3777 parameters. You can check and modify this variable using the
3778 "printenv" and "setenv" commands:
3781 => printenv bootargs
3782 bootargs=root=/dev/ram
3784 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3786 => printenv bootargs
3787 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3790 ## Booting Linux kernel at 40020000 ...
3791 Image Name: 2.2.13 for NFS on TQM850L
3792 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3793 Data Size: 381681 Bytes = 372 kB = 0 MB
3794 Load Address: 00000000
3795 Entry Point: 0000000c
3796 Verifying Checksum ... OK
3797 Uncompressing Kernel Image ... OK
3798 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
3799 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3800 time_init: decrementer frequency = 187500000/60
3801 Calibrating delay loop... 49.77 BogoMIPS
3802 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3805 If you want to boot a Linux kernel with initial RAM disk, you pass
3806 the memory addresses of both the kernel and the initrd image (PPBCOOT
3807 format!) to the "bootm" command:
3809 => imi 40100000 40200000
3811 ## Checking Image at 40100000 ...
3812 Image Name: 2.2.13 for initrd on TQM850L
3813 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3814 Data Size: 335725 Bytes = 327 kB = 0 MB
3815 Load Address: 00000000
3816 Entry Point: 0000000c
3817 Verifying Checksum ... OK
3819 ## Checking Image at 40200000 ...
3820 Image Name: Simple Ramdisk Image
3821 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3822 Data Size: 566530 Bytes = 553 kB = 0 MB
3823 Load Address: 00000000
3824 Entry Point: 00000000
3825 Verifying Checksum ... OK
3827 => bootm 40100000 40200000
3828 ## Booting Linux kernel at 40100000 ...
3829 Image Name: 2.2.13 for initrd on TQM850L
3830 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3831 Data Size: 335725 Bytes = 327 kB = 0 MB
3832 Load Address: 00000000
3833 Entry Point: 0000000c
3834 Verifying Checksum ... OK
3835 Uncompressing Kernel Image ... OK
3836 ## Loading RAMDisk Image at 40200000 ...
3837 Image Name: Simple Ramdisk Image
3838 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3839 Data Size: 566530 Bytes = 553 kB = 0 MB
3840 Load Address: 00000000
3841 Entry Point: 00000000
3842 Verifying Checksum ... OK
3843 Loading Ramdisk ... OK
3844 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
3845 Boot arguments: root=/dev/ram
3846 time_init: decrementer frequency = 187500000/60
3847 Calibrating delay loop... 49.77 BogoMIPS
3849 RAMDISK: Compressed image found at block 0
3850 VFS: Mounted root (ext2 filesystem).
3854 Boot Linux and pass a flat device tree:
3857 First, U-Boot must be compiled with the appropriate defines. See the section
3858 titled "Linux Kernel Interface" above for a more in depth explanation. The
3859 following is an example of how to start a kernel and pass an updated
3865 oft=oftrees/mpc8540ads.dtb
3866 => tftp $oftaddr $oft
3867 Speed: 1000, full duplex
3869 TFTP from server 192.168.1.1; our IP address is 192.168.1.101
3870 Filename 'oftrees/mpc8540ads.dtb'.
3871 Load address: 0x300000
3874 Bytes transferred = 4106 (100a hex)
3875 => tftp $loadaddr $bootfile
3876 Speed: 1000, full duplex
3878 TFTP from server 192.168.1.1; our IP address is 192.168.1.2
3880 Load address: 0x200000
3881 Loading:############
3883 Bytes transferred = 1029407 (fb51f hex)
3888 => bootm $loadaddr - $oftaddr
3889 ## Booting image at 00200000 ...
3890 Image Name: Linux-2.6.17-dirty
3891 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3892 Data Size: 1029343 Bytes = 1005.2 kB
3893 Load Address: 00000000
3894 Entry Point: 00000000
3895 Verifying Checksum ... OK
3896 Uncompressing Kernel Image ... OK
3897 Booting using flat device tree at 0x300000
3898 Using MPC85xx ADS machine description
3899 Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
3903 More About U-Boot Image Types:
3904 ------------------------------
3906 U-Boot supports the following image types:
3908 "Standalone Programs" are directly runnable in the environment
3909 provided by U-Boot; it is expected that (if they behave
3910 well) you can continue to work in U-Boot after return from
3911 the Standalone Program.
3912 "OS Kernel Images" are usually images of some Embedded OS which
3913 will take over control completely. Usually these programs
3914 will install their own set of exception handlers, device
3915 drivers, set up the MMU, etc. - this means, that you cannot
3916 expect to re-enter U-Boot except by resetting the CPU.
3917 "RAMDisk Images" are more or less just data blocks, and their
3918 parameters (address, size) are passed to an OS kernel that is
3920 "Multi-File Images" contain several images, typically an OS
3921 (Linux) kernel image and one or more data images like
3922 RAMDisks. This construct is useful for instance when you want
3923 to boot over the network using BOOTP etc., where the boot
3924 server provides just a single image file, but you want to get
3925 for instance an OS kernel and a RAMDisk image.
3927 "Multi-File Images" start with a list of image sizes, each
3928 image size (in bytes) specified by an "uint32_t" in network
3929 byte order. This list is terminated by an "(uint32_t)0".
3930 Immediately after the terminating 0 follow the images, one by
3931 one, all aligned on "uint32_t" boundaries (size rounded up to
3932 a multiple of 4 bytes).
3934 "Firmware Images" are binary images containing firmware (like
3935 U-Boot or FPGA images) which usually will be programmed to
3938 "Script files" are command sequences that will be executed by
3939 U-Boot's command interpreter; this feature is especially
3940 useful when you configure U-Boot to use a real shell (hush)
3941 as command interpreter.
3947 One of the features of U-Boot is that you can dynamically load and
3948 run "standalone" applications, which can use some resources of
3949 U-Boot like console I/O functions or interrupt services.
3951 Two simple examples are included with the sources:
3956 'examples/hello_world.c' contains a small "Hello World" Demo
3957 application; it is automatically compiled when you build U-Boot.
3958 It's configured to run at address 0x00040004, so you can play with it
3962 ## Ready for S-Record download ...
3963 ~>examples/hello_world.srec
3964 1 2 3 4 5 6 7 8 9 10 11 ...
3965 [file transfer complete]
3967 ## Start Addr = 0x00040004
3969 => go 40004 Hello World! This is a test.
3970 ## Starting application at 0x00040004 ...
3981 Hit any key to exit ...
3983 ## Application terminated, rc = 0x0
3985 Another example, which demonstrates how to register a CPM interrupt
3986 handler with the U-Boot code, can be found in 'examples/timer.c'.
3987 Here, a CPM timer is set up to generate an interrupt every second.
3988 The interrupt service routine is trivial, just printing a '.'
3989 character, but this is just a demo program. The application can be
3990 controlled by the following keys:
3992 ? - print current values og the CPM Timer registers
3993 b - enable interrupts and start timer
3994 e - stop timer and disable interrupts
3995 q - quit application
3998 ## Ready for S-Record download ...
3999 ~>examples/timer.srec
4000 1 2 3 4 5 6 7 8 9 10 11 ...
4001 [file transfer complete]
4003 ## Start Addr = 0x00040004
4006 ## Starting application at 0x00040004 ...
4009 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4012 [q, b, e, ?] Set interval 1000000 us
4015 [q, b, e, ?] ........
4016 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4019 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4022 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4025 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4027 [q, b, e, ?] ...Stopping timer
4029 [q, b, e, ?] ## Application terminated, rc = 0x0
4035 Over time, many people have reported problems when trying to use the
4036 "minicom" terminal emulation program for serial download. I (wd)
4037 consider minicom to be broken, and recommend not to use it. Under
4038 Unix, I recommend to use C-Kermit for general purpose use (and
4039 especially for kermit binary protocol download ("loadb" command), and
4040 use "cu" for S-Record download ("loads" command).
4042 Nevertheless, if you absolutely want to use it try adding this
4043 configuration to your "File transfer protocols" section:
4045 Name Program Name U/D FullScr IO-Red. Multi
4046 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
4047 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
4053 Starting at version 0.9.2, U-Boot supports NetBSD both as host
4054 (build U-Boot) and target system (boots NetBSD/mpc8xx).
4056 Building requires a cross environment; it is known to work on
4057 NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4058 need gmake since the Makefiles are not compatible with BSD make).
4059 Note that the cross-powerpc package does not install include files;
4060 attempting to build U-Boot will fail because <machine/ansi.h> is
4061 missing. This file has to be installed and patched manually:
4063 # cd /usr/pkg/cross/powerpc-netbsd/include
4065 # ln -s powerpc machine
4066 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4067 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
4069 Native builds *don't* work due to incompatibilities between native
4070 and U-Boot include files.
4072 Booting assumes that (the first part of) the image booted is a
4073 stage-2 loader which in turn loads and then invokes the kernel
4074 proper. Loader sources will eventually appear in the NetBSD source
4075 tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
4076 meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4079 Implementation Internals:
4080 =========================
4082 The following is not intended to be a complete description of every
4083 implementation detail. However, it should help to understand the
4084 inner workings of U-Boot and make it easier to port it to custom
4088 Initial Stack, Global Data:
4089 ---------------------------
4091 The implementation of U-Boot is complicated by the fact that U-Boot
4092 starts running out of ROM (flash memory), usually without access to
4093 system RAM (because the memory controller is not initialized yet).
4094 This means that we don't have writable Data or BSS segments, and BSS
4095 is not initialized as zero. To be able to get a C environment working
4096 at all, we have to allocate at least a minimal stack. Implementation
4097 options for this are defined and restricted by the CPU used: Some CPU
4098 models provide on-chip memory (like the IMMR area on MPC8xx and
4099 MPC826x processors), on others (parts of) the data cache can be
4100 locked as (mis-) used as memory, etc.
4102 Chris Hallinan posted a good summary of these issues to the
4103 U-Boot mailing list:
4105 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
4106 From: "Chris Hallinan" <clh@net1plus.com>
4107 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
4110 Correct me if I'm wrong, folks, but the way I understand it
4111 is this: Using DCACHE as initial RAM for Stack, etc, does not
4112 require any physical RAM backing up the cache. The cleverness
4113 is that the cache is being used as a temporary supply of
4114 necessary storage before the SDRAM controller is setup. It's
4115 beyond the scope of this list to explain the details, but you
4116 can see how this works by studying the cache architecture and
4117 operation in the architecture and processor-specific manuals.
4119 OCM is On Chip Memory, which I believe the 405GP has 4K. It
4120 is another option for the system designer to use as an
4121 initial stack/RAM area prior to SDRAM being available. Either
4122 option should work for you. Using CS 4 should be fine if your
4123 board designers haven't used it for something that would
4124 cause you grief during the initial boot! It is frequently not
4127 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
4128 with your processor/board/system design. The default value
4129 you will find in any recent u-boot distribution in
4130 walnut.h should work for you. I'd set it to a value larger
4131 than your SDRAM module. If you have a 64MB SDRAM module, set
4132 it above 400_0000. Just make sure your board has no resources
4133 that are supposed to respond to that address! That code in
4134 start.S has been around a while and should work as is when
4135 you get the config right.
4140 It is essential to remember this, since it has some impact on the C
4141 code for the initialization procedures:
4143 * Initialized global data (data segment) is read-only. Do not attempt
4146 * Do not use any uninitialized global data (or implicitely initialized
4147 as zero data - BSS segment) at all - this is undefined, initiali-
4148 zation is performed later (when relocating to RAM).
4150 * Stack space is very limited. Avoid big data buffers or things like
4153 Having only the stack as writable memory limits means we cannot use
4154 normal global data to share information beween the code. But it
4155 turned out that the implementation of U-Boot can be greatly
4156 simplified by making a global data structure (gd_t) available to all
4157 functions. We could pass a pointer to this data as argument to _all_
4158 functions, but this would bloat the code. Instead we use a feature of
4159 the GCC compiler (Global Register Variables) to share the data: we
4160 place a pointer (gd) to the global data into a register which we
4161 reserve for this purpose.
4163 When choosing a register for such a purpose we are restricted by the
4164 relevant (E)ABI specifications for the current architecture, and by
4165 GCC's implementation.
4167 For PowerPC, the following registers have specific use:
4169 R2: reserved for system use
4170 R3-R4: parameter passing and return values
4171 R5-R10: parameter passing
4172 R13: small data area pointer
4176 (U-Boot also uses R12 as internal GOT pointer. r12
4177 is a volatile register so r12 needs to be reset when
4178 going back and forth between asm and C)
4180 ==> U-Boot will use R2 to hold a pointer to the global data
4182 Note: on PPC, we could use a static initializer (since the
4183 address of the global data structure is known at compile time),
4184 but it turned out that reserving a register results in somewhat
4185 smaller code - although the code savings are not that big (on
4186 average for all boards 752 bytes for the whole U-Boot image,
4187 624 text + 127 data).
4189 On Blackfin, the normal C ABI (except for P3) is followed as documented here:
4190 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
4192 ==> U-Boot will use P3 to hold a pointer to the global data
4194 On ARM, the following registers are used:
4196 R0: function argument word/integer result
4197 R1-R3: function argument word
4199 R10: stack limit (used only if stack checking if enabled)
4200 R11: argument (frame) pointer
4201 R12: temporary workspace
4204 R15: program counter
4206 ==> U-Boot will use R8 to hold a pointer to the global data
4208 On Nios II, the ABI is documented here:
4209 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
4211 ==> U-Boot will use gp to hold a pointer to the global data
4213 Note: on Nios II, we give "-G0" option to gcc and don't use gp
4214 to access small data sections, so gp is free.
4216 NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4217 or current versions of GCC may "optimize" the code too much.
4222 U-Boot runs in system state and uses physical addresses, i.e. the
4223 MMU is not used either for address mapping nor for memory protection.
4225 The available memory is mapped to fixed addresses using the memory
4226 controller. In this process, a contiguous block is formed for each
4227 memory type (Flash, SDRAM, SRAM), even when it consists of several
4228 physical memory banks.
4230 U-Boot is installed in the first 128 kB of the first Flash bank (on
4231 TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4232 booting and sizing and initializing DRAM, the code relocates itself
4233 to the upper end of DRAM. Immediately below the U-Boot code some
4234 memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4235 configuration setting]. Below that, a structure with global Board
4236 Info data is placed, followed by the stack (growing downward).
4238 Additionally, some exception handler code is copied to the low 8 kB
4239 of DRAM (0x00000000 ... 0x00001FFF).
4241 So a typical memory configuration with 16 MB of DRAM could look like
4244 0x0000 0000 Exception Vector code
4247 0x0000 2000 Free for Application Use
4253 0x00FB FF20 Monitor Stack (Growing downward)
4254 0x00FB FFAC Board Info Data and permanent copy of global data
4255 0x00FC 0000 Malloc Arena
4258 0x00FE 0000 RAM Copy of Monitor Code
4259 ... eventually: LCD or video framebuffer
4260 ... eventually: pRAM (Protected RAM - unchanged by reset)
4261 0x00FF FFFF [End of RAM]
4264 System Initialization:
4265 ----------------------
4267 In the reset configuration, U-Boot starts at the reset entry point
4268 (on most PowerPC systems at address 0x00000100). Because of the reset
4269 configuration for CS0# this is a mirror of the onboard Flash memory.
4270 To be able to re-map memory U-Boot then jumps to its link address.
4271 To be able to implement the initialization code in C, a (small!)
4272 initial stack is set up in the internal Dual Ported RAM (in case CPUs
4273 which provide such a feature like MPC8xx or MPC8260), or in a locked
4274 part of the data cache. After that, U-Boot initializes the CPU core,
4275 the caches and the SIU.
4277 Next, all (potentially) available memory banks are mapped using a
4278 preliminary mapping. For example, we put them on 512 MB boundaries
4279 (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4280 on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4281 programmed for SDRAM access. Using the temporary configuration, a
4282 simple memory test is run that determines the size of the SDRAM
4285 When there is more than one SDRAM bank, and the banks are of
4286 different size, the largest is mapped first. For equal size, the first
4287 bank (CS2#) is mapped first. The first mapping is always for address
4288 0x00000000, with any additional banks following immediately to create
4289 contiguous memory starting from 0.
4291 Then, the monitor installs itself at the upper end of the SDRAM area
4292 and allocates memory for use by malloc() and for the global Board
4293 Info data; also, the exception vector code is copied to the low RAM
4294 pages, and the final stack is set up.
4296 Only after this relocation will you have a "normal" C environment;
4297 until that you are restricted in several ways, mostly because you are
4298 running from ROM, and because the code will have to be relocated to a
4302 U-Boot Porting Guide:
4303 ----------------------
4305 [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
4309 int main(int argc, char *argv[])
4311 sighandler_t no_more_time;
4313 signal(SIGALRM, no_more_time);
4314 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4316 if (available_money > available_manpower) {
4317 Pay consultant to port U-Boot;
4321 Download latest U-Boot source;
4323 Subscribe to u-boot mailing list;
4326 email("Hi, I am new to U-Boot, how do I get started?");
4329 Read the README file in the top level directory;
4330 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
4331 Read applicable doc/*.README;
4332 Read the source, Luke;
4333 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
4336 if (available_money > toLocalCurrency ($2500))
4339 Add a lot of aggravation and time;
4341 if (a similar board exists) { /* hopefully... */
4342 cp -a board/<similar> board/<myboard>
4343 cp include/configs/<similar>.h include/configs/<myboard>.h
4345 Create your own board support subdirectory;
4346 Create your own board include/configs/<myboard>.h file;
4348 Edit new board/<myboard> files
4349 Edit new include/configs/<myboard>.h
4354 Add / modify source code;
4358 email("Hi, I am having problems...");
4360 Send patch file to the U-Boot email list;
4361 if (reasonable critiques)
4362 Incorporate improvements from email list code review;
4364 Defend code as written;
4370 void no_more_time (int sig)
4379 All contributions to U-Boot should conform to the Linux kernel
4380 coding style; see the file "Documentation/CodingStyle" and the script
4381 "scripts/Lindent" in your Linux kernel source directory. In sources
4382 originating from U-Boot a style corresponding to "Lindent -pcs" (adding
4383 spaces before parameters to function calls) is actually used.
4385 Source files originating from a different project (for example the
4386 MTD subsystem) are generally exempt from these guidelines and are not
4387 reformated to ease subsequent migration to newer versions of those
4390 Please note that U-Boot is implemented in C (and to some small parts in
4391 Assembler); no C++ is used, so please do not use C++ style comments (//)
4394 Please also stick to the following formatting rules:
4395 - remove any trailing white space
4396 - use TAB characters for indentation, not spaces
4397 - make sure NOT to use DOS '\r\n' line feeds
4398 - do not add more than 2 empty lines to source files
4399 - do not add trailing empty lines to source files
4401 Submissions which do not conform to the standards may be returned
4402 with a request to reformat the changes.
4408 Since the number of patches for U-Boot is growing, we need to
4409 establish some rules. Submissions which do not conform to these rules
4410 may be rejected, even when they contain important and valuable stuff.
4412 Please see http://www.denx.de/wiki/U-Boot/Patches for details.
4414 Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
4415 see http://lists.denx.de/mailman/listinfo/u-boot
4417 When you send a patch, please include the following information with
4420 * For bug fixes: a description of the bug and how your patch fixes
4421 this bug. Please try to include a way of demonstrating that the
4422 patch actually fixes something.
4424 * For new features: a description of the feature and your
4427 * A CHANGELOG entry as plaintext (separate from the patch)
4429 * For major contributions, your entry to the CREDITS file
4431 * When you add support for a new board, don't forget to add this
4432 board to the MAKEALL script, too.
4434 * If your patch adds new configuration options, don't forget to
4435 document these in the README file.
4437 * The patch itself. If you are using git (which is *strongly*
4438 recommended) you can easily generate the patch using the
4439 "git-format-patch". If you then use "git-send-email" to send it to
4440 the U-Boot mailing list, you will avoid most of the common problems
4441 with some other mail clients.
4443 If you cannot use git, use "diff -purN OLD NEW". If your version of
4444 diff does not support these options, then get the latest version of
4447 The current directory when running this command shall be the parent
4448 directory of the U-Boot source tree (i. e. please make sure that
4449 your patch includes sufficient directory information for the
4452 We prefer patches as plain text. MIME attachments are discouraged,
4453 and compressed attachments must not be used.
4455 * If one logical set of modifications affects or creates several
4456 files, all these changes shall be submitted in a SINGLE patch file.
4458 * Changesets that contain different, unrelated modifications shall be
4459 submitted as SEPARATE patches, one patch per changeset.
4464 * Before sending the patch, run the MAKEALL script on your patched
4465 source tree and make sure that no errors or warnings are reported
4466 for any of the boards.
4468 * Keep your modifications to the necessary minimum: A patch
4469 containing several unrelated changes or arbitrary reformats will be
4470 returned with a request to re-formatting / split it.
4472 * If you modify existing code, make sure that your new code does not
4473 add to the memory footprint of the code ;-) Small is beautiful!
4474 When adding new features, these should compile conditionally only
4475 (using #ifdef), and the resulting code with the new feature
4476 disabled must not need more memory than the old code without your
4479 * Remember that there is a size limit of 100 kB per message on the
4480 u-boot mailing list. Bigger patches will be moderated. If they are
4481 reasonable and not too big, they will be acknowledged. But patches
4482 bigger than the size limit should be avoided.
projects / karo-tx-uboot.git / blob