X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=README;h=fd1e17c51375ccaf58d9c8331b4095794cc1e0b8;hb=d85c385332b7f9bf0491c7fc201ef6abf0b66938;hp=6f98e09e680d539246c279a18059c2f38ad7ce10;hpb=ebca902aeb3af3eaedd2787928184ad84a86b98f;p=oweals%2Fu-boot.git diff --git a/README b/README index 6f98e09e68..fd1e17c513 100644 --- a/README +++ b/README @@ -1,9 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0+ # # (C) Copyright 2000 - 2013 # Wolfgang Denk, DENX Software Engineering, wd@denx.de. -# -# SPDX-License-Identifier: GPL-2.0+ -# Summary: ======== @@ -333,11 +331,6 @@ The following options need to be configured: - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. -- Marvell Family Member - CONFIG_SYS_MVFS - define it if you want to enable - multiple fs option at one time - for marvell soc family - - 85xx CPU Options: CONFIG_SYS_PPC64 @@ -535,25 +528,6 @@ The following options need to be configured: pointer. This is needed for the temporary stack before relocation. - CONFIG_SYS_MIPS_CACHE_MODE - - Cache operation mode for the MIPS CPU. - See also arch/mips/include/asm/mipsregs.h. - Possible values are: - CONF_CM_CACHABLE_NO_WA - CONF_CM_CACHABLE_WA - CONF_CM_UNCACHED - CONF_CM_CACHABLE_NONCOHERENT - CONF_CM_CACHABLE_CE - CONF_CM_CACHABLE_COW - CONF_CM_CACHABLE_CUW - CONF_CM_CACHABLE_ACCELERATED - - CONFIG_SYS_XWAY_EBU_BOOTCFG - - Special option for Lantiq XWAY SoCs for booting from NOR flash. - See also arch/mips/cpu/mips32/start.S. - CONFIG_XWAY_SWAP_BYTES Enable compilation of tools/xway-swap-bytes needed for Lantiq @@ -660,8 +634,6 @@ The following options need to be configured: the defaults discussed just above. - Cache Configuration: - CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot - CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot - Cache Configuration for ARM: @@ -713,22 +685,6 @@ The following options need to be configured: as a convenience, when switching between booting from RAM and NFS. -- Pre-Boot Commands: - CONFIG_PREBOOT - - When this option is #defined, the existence of the - environment variable "preboot" will be checked - immediately before starting the CONFIG_BOOTDELAY - countdown and/or running the auto-boot command resp. - entering interactive mode. - - This feature is especially useful when "preboot" is - automatically generated or modified. For an example - see the LWMON board specific code: here "preboot" is - modified when the user holds down a certain - combination of keys on the (special) keyboard when - booting the systems - - Serial Download Echo Mode: CONFIG_LOADS_ECHO If defined to 1, all characters received during a @@ -809,9 +765,6 @@ The following options need to be configured: SoC, then define this variable and provide board specific code for the "hw_watchdog_reset" function. - CONFIG_AT91_HW_WDT_TIMEOUT - specify the timeout in seconds. default 2 seconds. - - Real-Time Clock: When CONFIG_CMD_DATE is selected, the type of the RTC @@ -881,9 +834,6 @@ The following options need to be configured: CONFIG_EFI_PARTITION GPT partition table, common when EFI is the bootloader. Note 2TB partition limit; see disk/part_efi.c - CONFIG_MTD_PARTITIONS Memory Technology Device partition table. - - If IDE or SCSI support is enabled (CONFIG_IDE or CONFIG_SCSI) you must configure support for at least one non-MTD partition type as well. @@ -987,9 +937,6 @@ The following options need to be configured: Define this to use i/o functions instead of macros (some hardware wont work with macros) - CONFIG_DRIVER_TI_EMAC - Support for davinci emac - CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT Define this if you have more then 3 PHYs. @@ -1171,20 +1118,10 @@ The following options need to be configured: CONFIG_SH_MMCIF_CLK Define the clock frequency for MMCIF - CONFIG_SUPPORT_EMMC_BOOT - Enable some additional features of the eMMC boot partitions. - - CONFIG_SUPPORT_EMMC_RPMB - Enable the commands for reading, writing and programming the - key for the Replay Protection Memory Block partition in eMMC. - - USB Device Firmware Update (DFU) class support: CONFIG_DFU_OVER_USB This enables the USB portion of the DFU USB class - 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. @@ -1465,15 +1402,6 @@ The following options need to be configured: forwarded through a router. (Environment variable "netmask") -- Multicast TFTP Mode: - CONFIG_MCAST_TFTP - - Defines whether you want to support multicast TFTP as per - rfc-2090; for example to work with atftp. Lets lots of targets - tftp down the same boot image concurrently. Note: the Ethernet - driver in use must provide a function: mcast() to join/leave a - multicast group. - - BOOTP Recovery Mode: CONFIG_BOOTP_RANDOM_DELAY @@ -1744,11 +1672,6 @@ The following options need to be configured: - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4 - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4 - - drivers/i2c/zynq_i2c.c - - activate this driver with CONFIG_SYS_I2C_ZYNQ - - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting - - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr - - drivers/i2c/s3c24x0_i2c.c: - activate this driver with CONFIG_SYS_I2C_S3C24X0 - This driver adds i2c buses (11 for Exynos5250, Exynos5420 @@ -1968,14 +1891,6 @@ The following options need to be configured: SPI configuration items (port pins to use, etc). For an example, see include/configs/sacsng.h. - CONFIG_HARD_SPI - - 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_SYS_SPI_MXC_WAIT Timeout for waiting until spi transfer completed. default: (CONFIG_SYS_HZ/100) /* 10 ms */ @@ -2042,13 +1957,6 @@ The following options need to be configured: 200 ms. - Configuration Management: - CONFIG_BUILD_TARGET - - Some SoCs need special image types (e.g. U-Boot binary - with a special header) as build targets. By defining - CONFIG_BUILD_TARGET in the SoC / board header, this - special image will be automatically built upon calling - make / buildman. CONFIG_IDENT_STRING @@ -2214,21 +2122,6 @@ The following options need to be configured: this is instead controlled by the value of /config/load-environment. -- Serial Flash support - Usage requires an initial 'sf probe' to define the serial - flash parameters, followed by read/write/erase/update - commands. - - The following defaults may be provided by the platform - to handle the common case when only a single serial - flash is present on the system. - - CONFIG_SF_DEFAULT_BUS Bus identifier - CONFIG_SF_DEFAULT_CS Chip-select - CONFIG_SF_DEFAULT_MODE (see include/spi.h) - CONFIG_SF_DEFAULT_SPEED in Hz - - - TFTP Fixed UDP Port: CONFIG_TFTP_PORT @@ -2413,19 +2306,6 @@ FIT uImage format: -150 common/cmd_nand.c Incorrect FIT image format 151 common/cmd_nand.c FIT image format OK -- legacy image format: - CONFIG_IMAGE_FORMAT_LEGACY - enables the legacy image format support in U-Boot. - - Default: - enabled if CONFIG_FIT_SIGNATURE is not defined. - - CONFIG_DISABLE_IMAGE_LEGACY - disable the legacy image format - - This define is introduced, as the legacy image format is - enabled per default for backward compatibility. - - Standalone program support: CONFIG_STANDALONE_LOAD_ADDR @@ -2457,17 +2337,6 @@ FIT uImage format: for a more detailed description refer to doc/README.update. - MTD Support (mtdparts command, UBI support) - CONFIG_MTD_DEVICE - - Adds the MTD device infrastructure from the Linux kernel. - Needed for mtdparts command support. - - CONFIG_MTD_PARTITIONS - - Adds the MTD partitioning infrastructure from the Linux - kernel. Needed for UBI support. - -- UBI support CONFIG_MTD_UBI_WL_THRESHOLD This parameter defines the maximum difference between the highest erase counter value and the lowest erase counter value of eraseblocks @@ -2549,9 +2418,6 @@ FIT uImage format: When defined, the linker checks that the actual size does not exceed it. - CONFIG_SPL_TEXT_BASE - TEXT_BASE for linking the SPL binary. - CONFIG_SPL_RELOC_TEXT_BASE Address to relocate to. If unspecified, this is equal to CONFIG_SPL_TEXT_BASE (i.e. no relocation is done). @@ -2649,6 +2515,10 @@ FIT uImage format: CONFIG_SPL_NAND_DRIVERS SPL uses normal NAND drivers, not minimal drivers. + CONFIG_SPL_NAND_IDENT + SPL uses the chip ID list to identify the NAND flash. + Requires CONFIG_SPL_NAND_BASE. + CONFIG_SPL_NAND_ECC Include standard software ECC in the SPL @@ -2710,7 +2580,7 @@ FIT uImage format: use an arch-specific makefile fragment instead, for example if more than one image needs to be produced. - CONFIG_FIT_SPL_PRINT + CONFIG_SPL_FIT_PRINT Printing information about a FIT image adds quite a bit of code to SPL. So this is normally disabled in SPL. Use this option to re-enable it. This will affect the output of the @@ -3052,11 +2922,6 @@ Configuration Settings: If defined, don't allow the -f switch to env set override variable access flags. -- CONFIG_USE_STDINT - If stdint.h is available with your toolchain you can define this - option to enable it. You can provide option 'USE_STDINT=1' when - building U-Boot to enable this. - The following definitions that deal with the placement and management of environment data (variable area); in general, we support the following configurations: @@ -3298,8 +3163,8 @@ Low Level (hardware related) configuration options: 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 + - drivers/mtd/nand/raw/ndfc.c + - drivers/mtd/nand/raw/mxc_nand.c - CONFIG_SYS_NDFC_EBC0_CFG Sets the EBC0_CFG register for the NDFC. If not defined @@ -3416,7 +3281,7 @@ Low Level (hardware related) configuration options: - CONFIG_SYS_NAND_NO_SUBPAGE_WRITE Option to disable subpage write in NAND driver driver that uses this: - drivers/mtd/nand/davinci_nand.c + drivers/mtd/nand/raw/davinci_nand.c Freescale QE/FMAN Firmware Support: ----------------------------------- @@ -3977,6 +3842,17 @@ If CONFIG_REGEX is defined, the variable_name above is evaluated as a regular expression. This allows multiple variables to be connected to the same callback without explicitly listing them all out. +The signature of the callback functions is: + + int callback(const char *name, const char *value, enum env_op op, int flags) + +* name - changed environment variable +* value - new value of the environment variable +* op - operation (create, overwrite, or delete) +* flags - attributes of the environment variable change, see flags H_* in + include/search.h + +The return value is 0 if the variable change is accepted and 1 otherwise. Command Line Parsing: =====================