X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=README;h=bab1a95d200a10c39c542682ac6e58cfbfb46940;hp=398d70d67c2ff6b24e7d927b84b80202a7e13743;hb=ec7023db8dc95966919589541f1ca09355a3f7a5;hpb=c08804853361bb7c6e2f9e0cdcdc0b327f71fe35

diff --git a/README b/README
index 398d70d67c..bab1a95d20 100644
--- a/README
+++ b/README
@@ -485,6 +485,24 @@ The following options need to be configured:
 		Thumb2 this flag will result in Thumb2 code generated by
 		GCC.
 
+		CONFIG_ARM_ERRATA_716044
+		CONFIG_ARM_ERRATA_742230
+		CONFIG_ARM_ERRATA_743622
+		CONFIG_ARM_ERRATA_751472
+
+		If set, the workarounds for these ARM errata are applied early
+		during U-Boot startup. Note that these options force the
+		workarounds to be applied; no CPU-type/version detection
+		exists, unlike the similar options in the Linux kernel. Do not
+		set these options unless they apply!
+
+- CPU timer options:
+		CONFIG_SYS_HZ
+
+		The frequency of the timer returned by get_timer().
+		get_timer() must operate in milliseconds and this CONFIG
+		option must be set to 1000.
+
 - Linux Kernel Interface:
 		CONFIG_CLOCKS_IN_MHZ
 
@@ -616,14 +634,6 @@ The following options need to be configured:
 		boot loader that has already initialized the UART.  Define this
 		variable to flush the UART at init time.
 
-		CONFIG_SYS_NS16550_BROKEN_TEMT
-
-		16550 UART set the Transmitter Empty (TEMT) Bit when all output
-		has finished and the transmitter is totally empty. U-Boot waits
-		for this bit to be set to initialize the serial console. On some
-		broken platforms this bit is not set in SPL making U-Boot to
-		hang while waiting for TEMT. Define this option to avoid it.
-
 
 - Console Interface:
 		Depending on board, define exactly one serial port
@@ -834,6 +844,7 @@ The following options need to be configured:
 		CONFIG_CMD_FDOS		* Dos diskette Support
 		CONFIG_CMD_FLASH	  flinfo, erase, protect
 		CONFIG_CMD_FPGA		  FPGA device initialization support
+		CONFIG_CMD_FUSE		  Device fuse support
 		CONFIG_CMD_GETTIME	* Get time since boot
 		CONFIG_CMD_GO		* the 'go' command (exec code)
 		CONFIG_CMD_GREPENV	* search environment
@@ -842,7 +853,8 @@ The following options need to be configured:
 		CONFIG_CMD_I2C		* I2C serial bus support
 		CONFIG_CMD_IDE		* IDE harddisk support
 		CONFIG_CMD_IMI		  iminfo
-		CONFIG_CMD_IMLS		  List all found images
+		CONFIG_CMD_IMLS		  List all images found in NOR flash
+		CONFIG_CMD_IMLS_NAND	  List all images found in NAND flash
 		CONFIG_CMD_IMMAP	* IMMR dump support
 		CONFIG_CMD_IMPORTENV	* import an environment
 		CONFIG_CMD_INI		* import data from an ini file into the env
@@ -859,7 +871,8 @@ The following options need to be configured:
 					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
 		CONFIG_CMD_MEMINFO	* Display detailed memory information
 		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
-					  loop, loopw, mtest
+					  loop, loopw
+		CONFIG_CMD_MEMTEST	  mtest
 		CONFIG_CMD_MISC		  Misc functions like sleep etc
 		CONFIG_CMD_MMC		* MMC memory mapped support
 		CONFIG_CMD_MII		* MII utility commands
@@ -876,6 +889,7 @@ The following options need to be configured:
 		CONFIG_CMD_READ		* Read raw data from partition
 		CONFIG_CMD_REGINFO	* Register dump
 		CONFIG_CMD_RUN		  run command in env variable
+		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
 		CONFIG_CMD_SAVES	* save S record dump
 		CONFIG_CMD_SCSI		* SCSI Support
 		CONFIG_CMD_SDRAM	* print SDRAM configuration information
@@ -917,6 +931,13 @@ The following options need to be configured:
 
 		XXX - this list needs to get updated!
 
+- Regular expression support:
+		CONFIG_REGEX
+                If this variable is defined, U-Boot is linked against
+                the SLRE (Super Light Regular Expression) library,
+                which adds regex support to some commands, as for
+                example "env grep" and "setexpr".
+
 - Device tree:
 		CONFIG_OF_CONTROL
 		If this variable is defined, U-Boot will use a device tree
@@ -1323,6 +1344,29 @@ The following options need to be configured:
 			CONFIG_SH_MMCIF_CLK
 			Define the clock frequency for MMCIF
 
+- USB Device Firmware Update (DFU) class support:
+		CONFIG_DFU_FUNCTION
+		This enables the USB portion of the DFU USB class
+
+		CONFIG_CMD_DFU
+		This enables the command "dfu" which is used to have
+		U-Boot create a DFU class device via USB.  This command
+		requires that the "dfu_alt_info" environment variable be
+		set and define the alt settings to expose to the host.
+
+		CONFIG_DFU_MMC
+		This enables support for exposing (e)MMC devices via DFU.
+
+		CONFIG_DFU_NAND
+		This enables support for exposing NAND devices via DFU.
+
+		CONFIG_SYS_DFU_MAX_FILE_SIZE
+		When updating files rather than the raw storage device,
+		we use a static buffer to copy the file into and then write
+		the buffer once we've been given the whole file.  Define
+		this to the maximum filesize (in bytes) for the buffer.
+		Default is 4 MiB if undefined.
+
 - Journaling Flash filesystem support:
 		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
 		CONFIG_JFFS2_NAND_DEV
@@ -1924,15 +1968,15 @@ CBFS (Coreboot Filesystem) support
 
 		I2C_READ
 
-		Code that returns TRUE if the I2C data line is high,
-		FALSE if it is low.
+		Code that returns true if the I2C data line is high,
+		false if it is low.
 
 		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
 
 		I2C_SDA(bit)
 
-		If <bit> is TRUE, sets the I2C data line high. If it
-		is FALSE, it clears it (low).
+		If <bit> is true, sets the I2C data line high. If it
+		is false, it clears it (low).
 
 		eg: #define I2C_SDA(bit) \
 			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
@@ -1940,8 +1984,8 @@ CBFS (Coreboot Filesystem) support
 
 		I2C_SCL(bit)
 
-		If <bit> is TRUE, sets the I2C clock line high. If it
-		is FALSE, it clears it (low).
+		If <bit> is true, sets the I2C clock line high. If it
+		is false, it clears it (low).
 
 		eg: #define I2C_SCL(bit) \
 			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
@@ -2762,6 +2806,32 @@ FIT uImage format:
 		Adds the MTD partitioning infrastructure from the Linux
 		kernel. Needed for UBI support.
 
+- UBI support
+		CONFIG_CMD_UBI
+
+		Adds commands for interacting with MTD partitions formatted
+		with the UBI flash translation layer
+
+		Requires also defining CONFIG_RBTREE
+
+		CONFIG_UBI_SILENCE_MSG
+
+		Make the verbose messages from UBI stop printing.  This leaves
+		warnings and errors enabled.
+
+- UBIFS support
+		CONFIG_CMD_UBIFS
+
+		Adds commands for interacting with UBI volumes formatted as
+		UBIFS.  UBIFS is read-only in u-boot.
+
+		Requires UBI support as well as CONFIG_LZO
+
+		CONFIG_UBIFS_SILENCE_MSG
+
+		Make the verbose messages from UBIFS stop printing.  This leaves
+		warnings and errors enabled.
+
 - SPL framework
 		CONFIG_SPL
 		Enable building of SPL globally.
@@ -2769,8 +2839,18 @@ FIT uImage format:
 		CONFIG_SPL_LDSCRIPT
 		LDSCRIPT for linking the SPL binary.
 
+		CONFIG_SPL_MAX_FOOTPRINT
+		Maximum size in memory allocated to the SPL, BSS included.
+		When defined, the linker checks that the actual memory
+		used by SPL from _start to __bss_end does not exceed it.
+		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
+		must not be both defined at the same time.
+
 		CONFIG_SPL_MAX_SIZE
-		Maximum binary size (text, data and rodata) of the SPL binary.
+		Maximum size of the SPL image (text, data, rodata, and
+		linker lists sections), BSS excluded.
+		When defined, the linker checks that the actual size does
+		not exceed it.
 
 		CONFIG_SPL_TEXT_BASE
 		TEXT_BASE for linking the SPL binary.
@@ -2783,7 +2863,11 @@ FIT uImage format:
 		Link address for the BSS within the SPL binary.
 
 		CONFIG_SPL_BSS_MAX_SIZE
-		Maximum binary size of the BSS section of the SPL binary.
+		Maximum size in memory allocated to the SPL BSS.
+		When defined, the linker checks that the actual memory used
+		by SPL from __bss_start to __bss_end does not exceed it.
+		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
+		must not be both defined at the same time.
 
 		CONFIG_SPL_STACK
 		Adress of the start of the stack SPL will use
@@ -2902,8 +2986,11 @@ FIT uImage format:
 		Support for lib/libgeneric.o in SPL binary
 
 		CONFIG_SPL_PAD_TO
-		Linker address to which the SPL should be padded before
-		appending the SPL payload.
+		Image offset to which the SPL should be padded before appending
+		the SPL payload. By default, this is defined as
+		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
+		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
+		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
 
 		CONFIG_SPL_TARGET
 		Final target image containing SPL and payload.  Some SPLs
@@ -3169,6 +3256,15 @@ Configuration Settings:
 		digits and dots.  Recommended value: 45 (9..1) for 80
 		column displays, 15 (3..1) for 40 column displays.
 
+- CONFIG_FLASH_VERIFY
+		If defined, the content of the flash (destination) is compared
+		against the source after the write operation. An error message
+		will be printed when the contents are not identical.
+		Please note that this option is useless in nearly all cases,
+		since such flash programming errors usually are detected earlier
+		while unprotecting/erasing/programming. Please only enable
+		this option if you really know what you are doing.
+
 - CONFIG_SYS_RX_ETH_BUFFER:
 		Defines the number of Ethernet receive buffers. On some
 		Ethernet controllers it is recommended to set this value
@@ -3228,6 +3324,23 @@ Configuration Settings:
 	If defined, don't allow the -f switch to env set override variable
 	access flags.
 
+- CONFIG_SYS_GENERIC_BOARD
+	This selects the architecture-generic board system instead of the
+	architecture-specific board files. It is intended to move boards
+	to this new framework over time. Defining this will disable the
+	arch/foo/lib/board.c file and use common/board_f.c and
+	common/board_r.c instead. To use this option your architecture
+	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
+	its config.mk file). If you find problems enabling this option on
+	your board please report the problem and send patches!
+
+- CONFIG_SYS_SYM_OFFSETS
+	This is set by architectures that use offsets for link symbols
+	instead of absolute values. So bss_start is obtained using an
+	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
+	directly. You should not need to touch this setting.
+
+
 The following definitions that deal with the placement and management
 of environment data (variable area); in general, we support the
 following configurations:
@@ -3461,6 +3574,33 @@ but it can not erase, write this NOR flash by SRIO or PCIE interface.
 	environment. If redundant environment is used, it will be copied to
 	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
 
+- CONFIG_ENV_IS_IN_UBI:
+
+	Define this if you have an UBI volume that you want to use for the
+	environment.  This has the benefit of wear-leveling the environment
+	accesses, which is important on NAND.
+
+	- CONFIG_ENV_UBI_PART:
+
+	  Define this to a string that is the mtd partition containing the UBI.
+
+	- CONFIG_ENV_UBI_VOLUME:
+
+	  Define this to the name of the volume that you want to store the
+	  environment in.
+
+	- CONFIG_ENV_UBI_VOLUME_REDUND:
+
+	  Define this to the name of another volume to store a second copy of
+	  the environment in.  This will enable redundant environments in UBI.
+	  It is assumed that both volumes are in the same MTD partition.
+
+	- CONFIG_UBI_SILENCE_MSG
+	- CONFIG_UBIFS_SILENCE_MSG
+
+	  You will probably want to define these to avoid a really noisy system
+	  when storing the env in UBI.
+
 - CONFIG_SYS_SPI_INIT_OFFSET
 
 	Defines offset to the initial SPI buffer area in DPRAM. The
@@ -3732,9 +3872,13 @@ Low Level (hardware related) configuration options:
 - CONFIG_SYS_SRIOn_MEM_SIZE:
 		Size of SRIO port 'n' memory region
 
-- CONFIG_SYS_NDFC_16
-		Defined to tell the NDFC that the NAND chip is using a
-		16 bit bus.
+- CONFIG_SYS_NAND_BUSWIDTH_16BIT
+		Defined to tell the NAND controller that the NAND chip is using
+		a 16 bit bus.
+		Not all NAND drivers use this symbol.
+		Example of drivers that use it:
+		- drivers/mtd/nand/ndfc.c
+		- drivers/mtd/nand/mxc_nand.c
 
 - CONFIG_SYS_NDFC_EBC0_CFG
 		Sets the EBC0_CFG register for the NDFC. If not defined
@@ -3829,6 +3973,15 @@ Low Level (hardware related) configuration options:
 		that is executed before the actual U-Boot. E.g. when
 		compiling a NAND SPL.
 
+- CONFIG_ARCH_MAP_SYSMEM
+		Generally U-Boot (and in particular the md command) uses
+		effective address. It is therefore not necessary to regard
+		U-Boot address as virtual addresses that need to be translated
+		to physical addresses. However, sandbox requires this, since
+		it maintains its own little RAM buffer which contains all
+		addressable memory. This option causes some memory accesses
+		to be mapped through map_sysmem() / unmap_sysmem().
+
 - CONFIG_USE_ARCH_MEMCPY
   CONFIG_USE_ARCH_MEMSET
 		If these options are used a optimized version of memcpy/memset will
@@ -3839,6 +3992,10 @@ Low Level (hardware related) configuration options:
 		If defined, the x86 reset vector code is included. This is not
 		needed when U-Boot is running from Coreboot.
 
+- CONFIG_SYS_MPUCLK
+		Defines the MPU clock speed (in MHz).
+
+		NOTE : currently only supported on AM335x platforms.
 
 Freescale QE/FMAN Firmware Support:
 -----------------------------------