#
-# (C) Copyright 2000 - 2005
+# (C) Copyright 2000 - 2008
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
"working". In fact, many of them are used in production systems.
In case of problems see the CHANGELOG and CREDITS files to find out
-who contributed the specific port.
+who contributed the specific port. The MAINTAINERS file lists board
+maintainers.
Where to get help:
http://lists.sourceforge.net/lists/listinfo/u-boot-users/
+Where to get source code:
+=========================
+
+The U-Boot source code is maintained in the git repository at
+git://www.denx.de/git/u-boot.git ; you can browse it online at
+http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
+
+The "snapshot" links on this page allow you to download tarballs of
+any version you might be interested in. Ofifcial releases are also
+available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
+directory.
+
+Pre-built (and tested) images are available from
+ftp://ftp.denx.de/pub/u-boot/images/
+
+
Where we come from:
===================
- create ARMBoot project (http://sourceforge.net/projects/armboot)
- add other CPU families (starting with ARM)
- create U-Boot project (http://sourceforge.net/projects/u-boot)
+- current project page: see http://www.denx.de/wiki/UBoot
Names and Spelling:
- at32ap Files specific to Atmel AVR32 AP CPUs
- i386 Files specific to i386 CPUs
- ixp Files specific to Intel XScale IXP CPUs
+ - leon2 Files specific to Gaisler LEON2 SPARC CPU
+ - leon3 Files specific to Gaisler LEON3 SPARC CPU
- mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
+ - mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
- mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
- mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
+ - mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
- mips Files specific to MIPS CPUs
- mpc5xx Files specific to Freescale MPC5xx CPUs
- mpc5xxx Files specific to Freescale MPC5xxx CPUs
- lib_mips Files generic to MIPS architecture
- lib_nios Files generic to NIOS architecture
- lib_ppc Files generic to PowerPC architecture
-- libfdt Library files to support flattened device trees
+- lib_sparc Files generic to SPARC architecture
+- libfdt Library files to support flattened device trees
- net Networking code
- post Power On Self Test
- rtc Real Time Clock drivers
converts clock data to MHZ before passing it to the
Linux kernel.
When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
- "clocks_in_mhz=1" is automatically included in the
+ "clocks_in_mhz=1" is automatically included in the
default environment.
CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
boards with QUICC Engines require OF_QE to set UCC mac addresses
- CONFIG_OF_HAS_BD_T
-
- * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command
- * CONFIG_OF_FLAT_TREE - The resulting flat device tree
- will have a copy of the bd_t. Space should be
- pre-allocated in the dts for the bd_t.
-
- CONFIG_OF_HAS_UBOOT_ENV
-
- * CONFIG_OF_LIBFDT - enables the "fdt env" command
- * CONFIG_OF_FLAT_TREE - The resulting flat device tree
- will have a copy of u-boot's environment variables
-
CONFIG_OF_BOARD_SETUP
Board code has addition modification that it wants to make
CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
+ CONFIG_RTC_MC13783 - use MC13783 RTC
CONFIG_RTC_MC146818 - use MC146818 RTC
CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
CONFIG_RTC_DS164x - use Dallas DS164x RTC
+ CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
+ CFG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
Note that if the RTC uses I2C, then the I2C interface
must also be configured. See I2C Support, below.
CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
and/or CONFIG_ISO_PARTITION
- If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
- CONFIG_CMD_SCSI) you must configure support for at least
- one partition type as well.
+ If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
+ CONFIG_CMD_SCSI) you must configure support for at
+ least one partition type as well.
- IDE Reset method:
CONFIG_IDE_RESET_ROUTINE - this is defined in several
CONFIG_E1000
Support for Intel 8254x gigabit chips.
+ CONFIG_E1000_FALLBACK_MAC
+ default MAC for empty eeprom after production.
+
CONFIG_EEPRO100
Support for Intel 82557/82559/82559ER chips.
Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
(i.e. setenv videomode 317; saveenv; reset;)
- "videomode=bootargs" all the video parameters are parsed
- from the bootargs. (See drivers/videomodes.c)
+ from the bootargs. (See drivers/video/videomodes.c)
CONFIG_VIDEO_SED13806
of the "hostname" environment variable is passed as
option 12 to the DHCP server.
+ CONFIG_BOOTP_DHCP_REQUEST_DELAY
+
+ A 32bit value in microseconds for a delay between
+ receiving a "DHCP Offer" and sending the "DHCP Request".
+ This fixes a problem with certain DHCP servers that don't
+ respond 100% of the time to a "DHCP request". E.g. On an
+ AT91RM9200 processor running at 180MHz, this delay needed
+ to be *at least* 15,000 usec before a Windows Server 2003
+ DHCP server would reply 100% of the time. I recommend at
+ least 50,000 usec to be safe. The alternative is to hope
+ that one of the retries will be successful but note that
+ the DHCP timeout and retry process takes a longer than
+ this delay.
+
- CDP Options:
CONFIG_CDP_DEVICE_ID
This option specifies a list of I2C devices that will be skipped
when the 'i2c probe' command is issued (or 'iprobe' using the legacy
command). If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
- pairs. Otherwise, specify a 1D array of device addresses
+ pairs. Otherwise, specify a 1D array of device addresses
e.g.
#undef CONFIG_I2C_MULTI_BUS
CONFIG_FSL_I2C
Define this option if you want to use Freescale's I2C driver in
- drivers/fsl_i2c.c.
+ drivers/i2c/fsl_i2c.c.
- SPI Support: CONFIG_SPI
SPI configuration items (port pins to use, etc). For
an example, see include/configs/sacsng.h.
-- FPGA Support: CONFIG_FPGA_COUNT
+ CONFIG_HARD_SPI
- Specify the number of FPGA devices to support.
+ Enables a hardware SPI driver for general-purpose reads
+ and writes. As with CONFIG_SOFT_SPI, the board configuration
+ must define a list of chip-select function pointers.
+ Currently supported on some MPC8xxx processors. For an
+ example, see include/configs/mpc8349emds.h.
- CONFIG_FPGA
+ CONFIG_MXC_SPI
- Used to specify the types of FPGA devices. For example,
- #define CONFIG_FPGA CFG_XILINX_VIRTEX2
+ Enables the driver for the SPI controllers on i.MX and MXC
+ SoCs. Currently only i.MX31 is supported.
+
+- FPGA Support: CONFIG_FPGA
+
+ Enables FPGA subsystem.
+
+ CONFIG_FPGA_<vendor>
+
+ Enables support for specific chip vendors.
+ (ALTERA, XILINX)
+
+ CONFIG_FPGA_<family>
+
+ Enables support for FPGA family.
+ (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
+
+ CONFIG_FPGA_COUNT
+
+ Specify the number of FPGA devices to support.
CFG_FPGA_PROG_FEEDBACK
before giving up the operation. If not defined, a
default value of 5 is used.
+ CONFIG_ARP_TIMEOUT
+
+ Timeout waiting for an ARP reply in milliseconds.
+
- Command Interpreter:
CONFIG_AUTO_COMPLETE
example, some LED's) on your board. At the moment,
the following checkpoints are implemented:
+Legacy uImage format:
+
Arg Where When
1 common/cmd_bootm.c before attempting to boot an image
-1 common/cmd_bootm.c Image header has bad magic number
4 common/cmd_bootm.c Image data has correct checksum
-4 common/cmd_bootm.c Image is for unsupported architecture
5 common/cmd_bootm.c Architecture check OK
- -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
+ -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
6 common/cmd_bootm.c Image Type check OK
-6 common/cmd_bootm.c gunzip uncompression error
-7 common/cmd_bootm.c Unimplemented compression type
7 common/cmd_bootm.c Uncompression OK
- -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
- 8 common/cmd_bootm.c Image Type check OK
+ 8 common/cmd_bootm.c No uncompress/copy overwrite error
-9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
- 9 common/cmd_bootm.c Start initial ramdisk verification
- -10 common/cmd_bootm.c Ramdisk header has bad magic number
- -11 common/cmd_bootm.c Ramdisk header has bad checksum
- 10 common/cmd_bootm.c Ramdisk header is OK
- -12 common/cmd_bootm.c Ramdisk data has bad checksum
- 11 common/cmd_bootm.c Ramdisk data has correct checksum
- 12 common/cmd_bootm.c Ramdisk verification complete, start loading
- -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk)
- 13 common/cmd_bootm.c Start multifile image verification
- 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue.
- 15 common/cmd_bootm.c All preparation done, transferring control to OS
+
+ 9 common/image.c Start initial ramdisk verification
+ -10 common/image.c Ramdisk header has bad magic number
+ -11 common/image.c Ramdisk header has bad checksum
+ 10 common/image.c Ramdisk header is OK
+ -12 common/image.c Ramdisk data has bad checksum
+ 11 common/image.c Ramdisk data has correct checksum
+ 12 common/image.c Ramdisk verification complete, start loading
+ -13 common/image.c Wrong Image Type (not PPC Linux Ramdisk)
+ 13 common/image.c Start multifile image verification
+ 14 common/image.c No initial ramdisk, no multifile, continue.
+
+ 15 lib_<arch>/bootm.c All preparation done, transferring control to OS
-30 lib_ppc/board.c Fatal error, hang the system
-31 post/post.c POST test failed, detected by post_output_backlog()
-83 common/cmd_net.c some error in automatic boot or autoscript
84 common/cmd_net.c end without errors
+FIT uImage format:
+
+ Arg Where When
+ 100 common/cmd_bootm.c Kernel FIT Image has correct format
+ -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
+ 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
+ -101 common/cmd_bootm.c Can't get configuration for kernel subimage
+ 102 common/cmd_bootm.c Kernel unit name specified
+ -103 common/cmd_bootm.c Can't get kernel subimage node offset
+ 103 common/cmd_bootm.c Found configuration node
+ 104 common/cmd_bootm.c Got kernel subimage node offset
+ -104 common/cmd_bootm.c Kernel subimage hash verification failed
+ 105 common/cmd_bootm.c Kernel subimage hash verification OK
+ -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
+ 106 common/cmd_bootm.c Architecture check OK
+ -106 common/cmd_bootm.c Kernel subimage has wrong typea
+ 107 common/cmd_bootm.c Kernel subimge type OK
+ -107 common/cmd_bootm.c Can't get kernel subimage data/size
+ 108 common/cmd_bootm.c Got kernel subimage data/size
+ -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
+ -109 common/cmd_bootm.c Can't get kernel subimage type
+ -110 common/cmd_bootm.c Can't get kernel subimage comp
+ -111 common/cmd_bootm.c Can't get kernel subimage os
+ -112 common/cmd_bootm.c Can't get kernel subimage load address
+ -113 common/cmd_bootm.c Image uncompress/copy overwrite error
+
+ 120 common/image.c Start initial ramdisk verification
+ -120 common/image.c Ramdisk FIT image has incorrect format
+ 121 common/image.c Ramdisk FIT image has correct format
+ 122 common/image.c No Ramdisk subimage unit name, using configuration
+ -122 common/image.c Can't get configuration for ramdisk subimage
+ 123 common/image.c Ramdisk unit name specified
+ -124 common/image.c Can't get ramdisk subimage node offset
+ 125 common/image.c Got ramdisk subimage node offset
+ -125 common/image.c Ramdisk subimage hash verification failed
+ 126 common/image.c Ramdisk subimage hash verification OK
+ -126 common/image.c Ramdisk subimage for unsupported architecture
+ 127 common/image.c Architecture check OK
+ -127 common/image.c Can't get ramdisk subimage data/size
+ 128 common/image.c Got ramdisk subimage data/size
+ 129 common/image.c Can't get ramdisk load address
+ -129 common/image.c Got ramdisk load address
+
+ -130 common/cmd_doc.c Icorrect FIT image format
+ 131 common/cmd_doc.c FIT image format OK
+
+ -140 common/cmd_ide.c Icorrect FIT image format
+ 141 common/cmd_ide.c FIT image format OK
+
+ -150 common/cmd_nand.c Icorrect FIT image format
+ 151 common/cmd_nand.c FIT image format OK
+
+
Modem Support:
--------------
Scratch address used by the alternate memory test
You only need to set this if address zero isn't writeable
+- CFG_MEM_TOP_HIDE (PPC only):
+ If CFG_MEM_TOP_HIDE is defined in the board config header,
+ this specified memory area will get subtracted from the top
+ (end) of ram and won't get "touched" at all by U-Boot. By
+ fixing up gd->ram_size the Linux kernel should gets passed
+ the now "corrected" memory size and won't touch it either.
+ This should work for arch/ppc and arch/powerpc. Only Linux
+ board ports in arch/powerpc with bootwrapper support that
+ recalculate the memory size from the SDRAM controller setup
+ will have to get fixed in Linux additionally.
+
+ This option can be used as a workaround for the 440EPx/GRx
+ CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
+ be touched.
+
+ WARNING: Please make sure that this value is a multiple of
+ the Linux page size (normally 4k). If this is not the case,
+ then the end address of the Linux memory will be located at a
+ non page size aligned address and this could cause major
+ problems.
+
- CFG_TFTP_LOADADDR:
Default load address for network file downloads
- CFG_BOOTMAPSZ:
Maximum size of memory mapped by the startup code of
the Linux kernel; all data that must be processed by
- the Linux kernel (bd_info, boot arguments, eventually
- initrd image) must be put below this limit.
+ the Linux kernel (bd_info, boot arguments, FDT blob if
+ used) must be put below this limit, unless "bootm_low"
+ enviroment variable is defined and non-zero. In such case
+ all data for the Linux kernel must be between "bootm_low"
+ and "bootm_low" + CFG_BOOTMAPSZ.
- CFG_MAX_FLASH_BANKS:
Max number of Flash memory banks
This option also enables the building of the cfi_flash driver
in the drivers directory
+- CFG_FLASH_USE_BUFFER_WRITE
+ Use buffered writes to flash.
+
+- CONFIG_FLASH_SPANSION_S29WS_N
+ s29ws-n MirrorBit flash has non-standard addresses for buffered
+ write commands.
+
- CFG_FLASH_QUIET_TEST
If this option is defined, the common CFI flash doesn't
print it's warning upon not recognized FLASH banks. This
is useful, if some of the configured banks are only
optionally available.
+- CONFIG_FLASH_SHOW_PROGRESS
+ If defined (must be an integer), print out countdown
+ digits and dots. Recommended value: 45 (9..1) for 80
+ column displays, 15 (3..1) for 40 column displays.
+
- CFG_RX_ETH_BUFFER:
Defines the number of ethernet receive buffers. On some
ethernet controllers it is recommended to set this value
enable I2C microcode relocation patch (MPC8xx);
define relocation offset in DPRAM [DSP2]
+- CFG_SMC_UCODE_PATCH, CFG_SMC_DPMEM_OFFSET [0x1FC0]:
+ enable SMC microcode relocation patch (MPC8xx);
+ define relocation offset in DPRAM [SMC1]
+
- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
enable SPI microcode relocation patch (MPC8xx);
define relocation offset in DPRAM [SCC4]
Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
- CONFIG_SPD_EEPROM
- Get DDR timing information from an I2C EEPROM. Common with pluggable
- memory modules such as SODIMMs
+ Get DDR timing information from an I2C EEPROM. Common
+ with pluggable memory modules such as SODIMMs
+
SPD_EEPROM_ADDRESS
I2C address of the SPD EEPROM
- CFG_SPD_BUS_NUM
- If SPD EEPROM is on an I2C bus other than the first one, specify here.
- Note that the value must resolve to something your driver can deal with.
+ If SPD EEPROM is on an I2C bus other than the first
+ one, specify here. Note that the value must resolve
+ to something your driver can deal with.
- CFG_83XX_DDR_USES_CS0
- Only for 83xx systems. If specified, then DDR should be configured
- using CS0 and CS1 instead of CS2 and CS3.
+ Only for 83xx systems. If specified, then DDR should
+ be configured using CS0 and CS1 instead of CS2 and CS3.
- CFG_83XX_DDR_USES_CS0
- Only for 83xx systems. If specified, then DDR should be configured
- using CS0 and CS1 instead of CS2 and CS3.
+ Only for 83xx systems. If specified, then DDR should
+ be configured using CS0 and CS1 instead of CS2 and CS3.
- CONFIG_ETHER_ON_FEC[12]
Define to enable FEC[12] on a 8xx series processor.
Building the Software:
======================
-Building U-Boot has been tested in native PPC environments (on a
-PowerBook G3 running LinuxPPC 2000) and in cross environments
-(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
-NetBSD 1.5 on x86).
-
-If you are not using a native PPC environment, it is assumed that you
-have the GNU cross compiling tools available in your path and named
-with a prefix of "powerpc-linux-". If this is not the case, (e.g. if
-you are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
-the definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
-change it to:
+Building U-Boot has been tested in several native build environments
+and in many different cross environments. Of course we cannot support
+all possibly existing versions of cross development tools in all
+(potentially obsolete) versions. In case of tool chain problems we
+recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
+which is extensively used to build and test U-Boot.
- CROSS_COMPILE = ppc_4xx-
+If you are not using a native environment, it is assumed that you
+have GNU cross compiling tools available in your path. In this case,
+you must set the environment variable CROSS_COMPILE in your shell.
+Note that no changes to the Makefile or any other source files are
+necessary. For example using the ELDK on a 4xx CPU, please enter:
+ $ CROSS_COMPILE=ppc_4xx-
+ $ export CROSS_COMPILE
-U-Boot is intended to be simple to build. After installing the
-sources you must configure U-Boot for one specific board type. This
+U-Boot is intended to be simple to build. After installing the
+sources you must configure U-Boot for one specific board type. This
is done by typing:
make NAME_config
-where "NAME_config" is the name of one of the existing
-configurations; see the main Makefile for supported names.
+where "NAME_config" is the name of one of the existing configu-
+rations; see the main Makefile for supported names.
Note: for some board special configuration names may exist; check if
additional information is available from the board vendor; for
Testing of U-Boot Modifications, Ports to New Hardware, etc.:
==============================================================
-If you have modified U-Boot sources (for instance added a new board
-or support for new devices, a new CPU, etc.) you are expected to
+If you have modified U-Boot sources (for instance added a new board
+or support for new devices, a new CPU, etc.) you are expected to
provide feedback to the other developers. The feedback normally takes
the form of a "patch", i. e. a context diff against a certain (latest
-official or latest in CVS) version of U-Boot sources.
+official or latest in the git repository) version of U-Boot sources.
-But before you submit such a patch, please verify that your modifi-
-cation did not break existing code. At least make sure that *ALL* of
+But before you submit such a patch, please verify that your modifi-
+cation did not break existing code. At least make sure that *ALL* of
the supported boards compile WITHOUT ANY compiler warnings. To do so,
just run the "MAKEALL" script, which will configure and build U-Boot
-for ALL supported system. Be warned, this will take a while. You can
-select which (cross) compiler to use by passing a `CROSS_COMPILE'
-environment variable to the script, i. e. to use the cross tools from
-MontaVista's Hard Hat Linux you can type
+for ALL supported system. Be warned, this will take a while. You can
+select which (cross) compiler to use by passing a `CROSS_COMPILE'
+environment variable to the script, i. e. to use the ELDK cross tools
+you can type
CROSS_COMPILE=ppc_8xx- MAKEALL
CROSS_COMPILE=' ' MAKEALL
-When using the MAKEALL script, the default behaviour is to build U-Boot
-in the source directory. This location can be changed by setting the
-BUILD_DIR environment variable. Also, for each target built, the MAKEALL
-script saves two log files (<target>.ERR and <target>.MAKEALL) in the
-<source dir>/LOG directory. This default location can be changed by
-setting the MAKEALL_LOGDIR environment variable. For example:
+When using the MAKEALL script, the default behaviour is to build
+U-Boot in the source directory. This location can be changed by
+setting the BUILD_DIR environment variable. Also, for each target
+built, the MAKEALL script saves two log files (<target>.ERR and
+<target>.MAKEALL) in the <source dir>/LOG directory. This default
+location can be changed by setting the MAKEALL_LOGDIR environment
+variable. For example:
export BUILD_DIR=/tmp/build
export MAKEALL_LOGDIR=/tmp/log
CROSS_COMPILE=ppc_8xx- MAKEALL
-With the above settings build objects are saved in the /tmp/build, log
-files are saved in the /tmp/log and the source tree remains clean during
-the whole build process.
+With the above settings build objects are saved in the /tmp/build,
+log files are saved in the /tmp/log and the source tree remains clean
+during the whole build process.
See also "U-Boot Porting Guide" below.
bootfile - Name of the image to load with TFTP
+ bootm_low - Memory range available for image processing in the bootm
+ command can be restricted. This variable is given as
+ a hexadecimal number and defines lowest address allowed
+ for use by the bootm command. See also "bootm_size"
+ environment variable. Address defined by "bootm_low" is
+ also the base of the initial memory mapping for the Linux
+ kernel -- see the descripton of CFG_BOOTMAPSZ.
+
+ bootm_size - Memory range available for image processing in the bootm
+ command can be restricted. This variable is given as
+ a hexadecimal number and defines the size of the region
+ allowed for use by the bootm command. See also "bootm_low"
+ environment variable.
+
autoload - if set to "no" (any string beginning with 'n'),
"bootp" will just load perform a lookup of the
configuration from the BOOTP server, but not try to
load any image using TFTP
+ autoscript - if set to "yes" commands like "loadb", "loady",
+ "bootp", "tftpb", "rarpboot" and "nfs" will attempt
+ to automatically run script images (by internally
+ calling "autoscript").
+
+ autoscript_uname - if script image is in a format (FIT) this
+ variable is used to get script subimage unit name.
+
autostart - if set to "yes", an image loaded using the "bootp",
"rarpboot", "tftpboot" or "diskboot" commands will
be automatically started (by internally calling
=> setenv ethact SCC ETHERNET
=> ping 10.0.0.1 # traffic sent on SCC ETHERNET
+ ethrotate - When set to "no" U-Boot does not go through all
+ available network interfaces.
+ It just stays at the currently selected interface.
+
netretry - When set to "no" each network operation will
either succeed or fail without retrying.
When set to "once" the network operation will
Useful on scripts which control the retry operation
themselves.
+ npe_ucode - see CONFIG_IXP4XX_NPE_EXT_UCOD
+ if set load address for the npe microcode
+
tftpsrcport - If this is set, the value is used for TFTP's
UDP source port.
Image Formats:
==============
-The "boot" commands of this monitor operate on "image" files which
-can be basicly anything, preceeded by a special header; see the
-definitions in include/image.h for details; basicly, the header
-defines the following image properties:
+U-Boot is capable of booting (and performing other auxiliary operations on)
+images in two formats:
+
+New uImage format (FIT)
+-----------------------
+
+Flexible and powerful format based on Flattened Image Tree -- FIT (similar
+to Flattened Device Tree). It allows the use of images with multiple
+components (several kernels, ramdisks, etc.), with contents protected by
+SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
+
+
+Old uImage format
+-----------------
+
+Old image format is based on binary files which can be basically anything,
+preceded by a special header; see the definitions in include/image.h for
+details; basically, the header defines the following image properties:
* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
You can check the success of the download using the 'iminfo' command;
-this includes a checksum verification so you can be sure no data
+this includes a checksum verification so you can be sure no data
corruption happened:
=> imi 40100000
MPC826x processors), on others (parts of) the data cache can be
locked as (mis-) used as memory, etc.
- Chris Hallinan posted a good summary of these issues to the
+ Chris Hallinan posted a good summary of these issues to the
u-boot-users mailing list:
Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
For PowerPC, the following registers have specific use:
R1: stack pointer
- R2: TOC pointer
+ R2: reserved for system use
R3-R4: parameter passing and return values
R5-R10: parameter passing
R13: small data area pointer
(U-Boot also uses R14 as internal GOT pointer.)
- ==> U-Boot will use R29 to hold a pointer to the global data
+ ==> U-Boot will use R2 to hold a pointer to the global data
Note: on PPC, we could use a static initializer (since the
address of the global data structure is known at compile time),
average for all boards 752 bytes for the whole U-Boot image,
624 text + 127 data).
+On Blackfin, the normal C ABI (except for P5) is followed as documented here:
+ http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
+
+ ==> U-Boot will use P5 to hold a pointer to the global data
+
On ARM, the following registers are used:
R0: function argument word/integer result
Patches shall be sent to the u-boot-users mailing list.
+Please see http://www.denx.de/wiki/UBoot/Patches for details.
+
When you send a patch, please include the following information with
it:
* If your patch adds new configuration options, don't forget to
document these in the README file.
-* The patch itself. If you are accessing the CVS repository use "cvs
- update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
- version of diff does not support these options, then get the latest
- version of GNU diff.
+* The patch itself. If you are using git (which is *strongly*
+ recommended) you can easily generate the patch using the
+ "git-format-patch". If you then use "git-send-email" to send it to
+ the U-Boot mailing list, you will avoid most of the common problems
+ with some other mail clients.
+
+ If you cannot use git, use "diff -purN OLD NEW". If your version of
+ diff does not support these options, then get the latest version of
+ GNU diff.
- The current directory when running this command shall be the top
- level directory of the U-Boot source tree, or it's parent directory
- (i. e. please make sure that your patch includes sufficient
- directory information for the affected files).
+ The current directory when running this command shall be the parent
+ directory of the U-Boot source tree (i. e. please make sure that
+ your patch includes sufficient directory information for the
+ affected files).
- We accept patches as plain text, MIME attachments or as uuencoded
- gzipped text.
+ We prefer patches as plain text. MIME attachments are discouraged,
+ and compressed attachments must not be used.
* If one logical set of modifications affects or creates several
files, all these changes shall be submitted in a SINGLE patch file.
modification.
* Remember that there is a size limit of 40 kB per message on the
- u-boot-users mailing list. Compression may help.
+ u-boot-users mailing list. Bigger patches will be moderated. If
+ they are reasonable and not bigger than 100 kB, they will be
+ acknowledged. Even bigger patches should be avoided.
projects / karo-tx-uboot.git / blobdiff