+# 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:
========
- 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
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_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
-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
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
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:
-----------------------------------
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:
=====================
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