- 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
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
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:
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
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
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.
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.
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.
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
- 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
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 */
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
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
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
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).
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
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
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:
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
- 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:
-----------------------------------
- CONFIG_SYS_FMAN_FW_ADDR
The address in the storage device where the FMAN microcode is located. The
- meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
+ meaning of this address depends on which CONFIG_SYS_QE_FMAN_FW_IN_xxx macro
is also specified.
- CONFIG_SYS_QE_FW_ADDR
The address in the storage device where the QE microcode is located. The
- meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
+ meaning of this address depends on which CONFIG_SYS_QE_FMAN_FW_IN_xxx macro
is also specified.
- CONFIG_SYS_QE_FMAN_FW_LENGTH
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:
=====================
projects / oweals / u-boot.git / blobdiff