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u-boot/env/Kconfig
Simon Glass 86b9c3e4e4 env: Allow U-Boot scripts to be placed in a .env file 
At present U-Boot environment variables, and thus scripts, are defined
by CONFIG_EXTRA_ENV_SETTINGS. It is painful to add large amounts of text
to this file and dealing with quoting and newlines is harder than it
should be. It would be better if we could just type the script into a
text file and have it included by U-Boot.

Add a feature that brings in a .env file associated with the board
config, if present. To use it, create a file in a board/<vendor>
directory, typically called <board>.env and controlled by the
CONFIG_ENV_SOURCE_FILE option.

The environment variables should be of the form "var=value". Values can
extend to multiple lines. See the README under 'Environment Variables:'
for more information and an example.

In many cases environment variables need access to the U-Boot CONFIG
variables to select different options. Enable this so that the environment
scripts can be as useful as the ones currently in the board config files.
This uses the C preprocessor, means that comments can be included in the
environment using /* ... */

Also support += to allow variables to be appended to. This is needed when
using the preprocessor.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Tested-by: Marek Behún <marek.behun@nic.cz>
2021-11-16 14:35:08 -05:00

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menu "Environment"
config ENV_SUPPORT
def_bool y
config ENV_SOURCE_FILE
string "Environment file to use"
default ""
help
This sets the basename to use to generate the default environment.
This a text file as described in doc/usage/environment.rst
The file must be in the board directory and have a .env extension, so
the resulting filename is typically
board/<vendor>/<board>/<CONFIG_ENV_SOURCE_FILE>.env
If the file is not present, an error is produced.
If this CONFIG is empty, U-Boot uses CONFIG SYS_BOARD as a default, if
the file board/<vendor>/<board>/<SYS_BOARD>.env exists. Otherwise the
environment is assumed to come from the ad-hoc
CONFIG_EXTRA_ENV_SETTINGS #define
config SAVEENV
def_bool y if CMD_SAVEENV
config ENV_OVERWRITE
bool "Enable overwriting environment"
help
Use this to permit overriding of certain environmental variables
like Ethernet and Serial
config ENV_IS_NOWHERE
bool "Environment is not stored"
default y if !ENV_IS_IN_EEPROM && !ENV_IS_IN_EXT4 && \
!ENV_IS_IN_FAT && !ENV_IS_IN_FLASH && \
!ENV_IS_IN_MMC && !ENV_IS_IN_NAND && \
!ENV_IS_IN_NVRAM && !ENV_IS_IN_ONENAND && \
!ENV_IS_IN_REMOTE && !ENV_IS_IN_SPI_FLASH && \
!ENV_IS_IN_UBI
help
Define this if you don't want to or can't have an environment stored
on a storage medium. In this case the environment will still exist
while U-Boot is running, but once U-Boot exits it will not be
stored. U-Boot will therefore always start up with a default
environment.
config ENV_IS_IN_EEPROM
bool "Environment in EEPROM"
depends on !CHAIN_OF_TRUST
help
Use this if you have an EEPROM or similar serial access
device and a driver for it.
- CONFIG_ENV_OFFSET:
- CONFIG_ENV_SIZE:
These two #defines specify the offset and size of the
environment area within the total memory of your EEPROM.
Note that we consider the length of the address field to
still be one byte because the extra address bits are hidden
in the chip address.
- CONFIG_I2C_ENV_EEPROM_BUS
if you have an Environment on an EEPROM reached over
I2C muxes, you can define here, how to reach this
EEPROM. For example:
#define CONFIG_I2C_ENV_EEPROM_BUS 1
EEPROM which holds the environment, is reached over
a pca9547 i2c mux with address 0x70, channel 3.
config ENV_IS_IN_FAT
bool "Environment is in a FAT filesystem"
depends on !CHAIN_OF_TRUST
default y if ARCH_BCM283X
default y if ARCH_SUNXI && MMC
default y if MMC_OMAP_HS && TI_COMMON_CMD_OPTIONS
select FS_FAT
select FAT_WRITE
help
Define this if you want to use the FAT file system for the environment.
config ENV_IS_IN_EXT4
bool "Environment is in a EXT4 filesystem"
depends on !CHAIN_OF_TRUST
select FS_EXT4
select EXT4_WRITE
help
Define this if you want to use the EXT4 file system for the environment.
config ENV_IS_IN_FLASH
bool "Environment in flash memory"
depends on !CHAIN_OF_TRUST
default y if ARCH_CINTEGRATOR
default y if ARCH_INTEGRATOR_CP
default y if M548x || M547x || M5282
default y if MCF532x || MCF52x2
default y if MPC86xx || MPC83xx
default y if ARCH_MPC8548
default y if SH && !CPU_SH4
help
Define this if you have a flash device which you want to use for the
environment.
a) The environment occupies one whole flash sector, which is
"embedded" in the text segment with the U-Boot code. This
happens usually with "bottom boot sector" or "top boot
sector" type flash chips, which have several smaller
sectors at the start or the end. For instance, such a
layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
such a case you would place the environment in one of the
4 kB sectors - with U-Boot code before and after it. With
"top boot sector" type flash chips, you would put the
environment in one of the last sectors, leaving a gap
between U-Boot and the environment.
CONFIG_ENV_OFFSET:
Offset of environment data (variable area) to the
beginning of flash memory; for instance, with bottom boot
type flash chips the second sector can be used: the offset
for this sector is given here.
CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
CONFIG_ENV_ADDR:
This is just another way to specify the start address of
the flash sector containing the environment (instead of
CONFIG_ENV_OFFSET).
CONFIG_ENV_SECT_SIZE:
Size of the sector containing the environment.
b) Sometimes flash chips have few, equal sized, BIG sectors.
In such a case you don't want to spend a whole sector for
the environment.
CONFIG_ENV_SIZE:
If you use this in combination with CONFIG_ENV_IS_IN_FLASH
and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
of this flash sector for the environment. This saves
memory for the RAM copy of the environment.
It may also save flash memory if you decide to use this
when your environment is "embedded" within U-Boot code,
since then the remainder of the flash sector could be used
for U-Boot code. It should be pointed out that this is
STRONGLY DISCOURAGED from a robustness point of view:
updating the environment in flash makes it always
necessary to erase the WHOLE sector. If something goes
wrong before the contents has been restored from a copy in
RAM, your target system will be dead.
CONFIG_ENV_ADDR_REDUND
These settings describe a second storage area used to hold
a redundant copy of the environment data, so that there is
a valid backup copy in case there is a power failure during
a "saveenv" operation.
BE CAREFUL! Any changes to the flash layout, and some changes to the
source code will make it necessary to adapt <board>/u-boot.lds*
accordingly!
config ENV_IS_IN_MMC
bool "Environment in an MMC device"
depends on !CHAIN_OF_TRUST
depends on MMC
default y if ARCH_EXYNOS4
default y if MX6SX || MX7D
default y if TEGRA30 || TEGRA124
default y if TEGRA_ARMV8_COMMON
help
Define this if you have an MMC device which you want to use for the
environment.
CONFIG_SYS_MMC_ENV_DEV:
Specifies which MMC device the environment is stored in.
CONFIG_SYS_MMC_ENV_PART (optional):
Specifies which MMC partition the environment is stored in. If not
set, defaults to partition 0, the user area. Common values might be
1 (first MMC boot partition), 2 (second MMC boot partition).
CONFIG_ENV_OFFSET:
CONFIG_ENV_SIZE:
These two #defines specify the offset and size of the environment
area within the specified MMC device.
If offset is positive (the usual case), it is treated as relative to
the start of the MMC partition. If offset is negative, it is treated
as relative to the end of the MMC partition. This can be useful if
your board may be fitted with different MMC devices, which have
different sizes for the MMC partitions, and you always want the
environment placed at the very end of the partition, to leave the
maximum possible space before it, to store other data.
These two values are in units of bytes, but must be aligned to an
MMC sector boundary.
CONFIG_ENV_OFFSET_REDUND (optional):
Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
hold a redundant copy of the environment data. This provides a
valid backup copy in case the other copy is corrupted, e.g. due
to a power failure during a "saveenv" operation.
This value may also be positive or negative; this is handled in the
same way as CONFIG_ENV_OFFSET.
In case CONFIG_SYS_MMC_ENV_PART is 1 (i.e. environment in eMMC boot
partition) then setting CONFIG_ENV_OFFSET_REDUND to the same value
as CONFIG_ENV_OFFSET makes use of the second eMMC boot partition for
the redundant environment copy.
This value is also in units of bytes, but must also be aligned to
an MMC sector boundary.
config ENV_IS_IN_NAND
bool "Environment in a NAND device"
depends on !CHAIN_OF_TRUST
help
Define this if you have a NAND device which you want to use for the
environment.
- CONFIG_ENV_OFFSET:
- CONFIG_ENV_SIZE:
These two #defines specify the offset and size of the environment
area within the first NAND device. CONFIG_ENV_OFFSET must be
aligned to an erase block boundary.
- CONFIG_ENV_OFFSET_REDUND (optional):
This setting describes a second storage area of CONFIG_ENV_SIZE
size used to hold a redundant copy of the environment data, so
that there is a valid backup copy in case there is a power failure
during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be
aligned to an erase block boundary.
- CONFIG_ENV_RANGE (optional):
Specifies the length of the region in which the environment
can be written. This should be a multiple of the NAND device's
block size. Specifying a range with more erase blocks than
are needed to hold CONFIG_ENV_SIZE allows bad blocks within
the range to be avoided.
- CONFIG_ENV_OFFSET_OOB (optional):
Enables support for dynamically retrieving the offset of the
environment from block zero's out-of-band data. The
"nand env.oob" command can be used to record this offset.
Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
using CONFIG_ENV_OFFSET_OOB.
config ENV_IS_IN_NVRAM
bool "Environment in a non-volatile RAM"
depends on !CHAIN_OF_TRUST
help
Define this if you have some non-volatile memory device
(NVRAM, battery buffered SRAM) which you want to use for the
environment.
- CONFIG_ENV_ADDR:
- CONFIG_ENV_SIZE:
These two #defines are used to determine the memory area you
want to use for environment. It is assumed that this memory
can just be read and written to, without any special
provision.
config ENV_IS_IN_ONENAND
bool "Environment is in OneNAND"
depends on !CHAIN_OF_TRUST
help
Define this if you want to put your local device's environment in
OneNAND.
- CONFIG_ENV_ADDR:
- CONFIG_ENV_SIZE:
These two #defines are used to determine the device range you
want to use for environment. It is assumed that this memory
can just be read and written to, without any special
provision.
config ENV_IS_IN_REMOTE
bool "Environment is in remote memory space"
depends on !CHAIN_OF_TRUST
help
Define this if you have a remote memory space which you
want to use for the local device's environment.
- CONFIG_ENV_ADDR:
- CONFIG_ENV_SIZE:
These two #defines specify the address and size of the
environment area within the remote memory space. The
local device can get the environment from remote memory
space by SRIO or PCIE links.
config ENV_IS_IN_SPI_FLASH
bool "Environment is in SPI flash"
depends on !CHAIN_OF_TRUST && SPI
default y if ARMADA_XP
default y if INTEL_BAYTRAIL
default y if INTEL_BRASWELL
default y if INTEL_BROADWELL
default y if NORTHBRIDGE_INTEL_IVYBRIDGE
default y if INTEL_QUARK
default y if INTEL_QUEENSBAY
help
Define this if you have a SPI Flash memory device which you
want to use for the environment.
- CONFIG_ENV_OFFSET:
- CONFIG_ENV_SIZE:
These two #defines specify the offset and size of the
environment area within the SPI Flash. CONFIG_ENV_OFFSET must be
aligned to an erase sector boundary.
- CONFIG_ENV_SECT_SIZE:
Define the SPI flash's sector size.
- CONFIG_ENV_OFFSET_REDUND (optional):
This setting describes a second storage area of CONFIG_ENV_SIZE
size used to hold a redundant copy of the environment data, so
that there is a valid backup copy in case there is a power failure
during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be
aligned to an erase sector boundary.
config ENV_SECT_SIZE_AUTO
bool "Use automatically detected sector size"
depends on ENV_IS_IN_SPI_FLASH
help
Some boards exist in multiple variants, with different
flashes having different sector sizes. In such cases, you
can select this option to make U-Boot use the actual sector
size when figuring out how much to erase, which can thus be
more efficient on the flashes with smaller erase size. Since
the environment must always be aligned on a sector boundary,
CONFIG_ENV_OFFSET must be aligned to the largest of the
different sector sizes, and CONFIG_ENV_SECT_SIZE should be
set to that value.
config USE_ENV_SPI_BUS
bool "SPI flash bus for environment"
depends on ENV_IS_IN_SPI_FLASH
help
Force the SPI bus for environment.
If not defined, use CONFIG_SF_DEFAULT_BUS.
config ENV_SPI_BUS
int "Value of SPI flash bus for environment"
depends on USE_ENV_SPI_BUS
help
Value the SPI bus and chip select for environment.
config USE_ENV_SPI_CS
bool "SPI flash chip select for environment"
depends on ENV_IS_IN_SPI_FLASH
help
Force the SPI chip select for environment.
If not defined, use CONFIG_SF_DEFAULT_CS.
config ENV_SPI_CS
int "Value of SPI flash chip select for environment"
depends on USE_ENV_SPI_CS
help
Value of the SPI chip select for environment.
config USE_ENV_SPI_MAX_HZ
bool "SPI flash max frequency for environment"
depends on ENV_IS_IN_SPI_FLASH
help
Force the SPI max work clock for environment.
If not defined, use CONFIG_SF_DEFAULT_SPEED.
config ENV_SPI_MAX_HZ
int "Value of SPI flash max frequency for environment"
depends on USE_ENV_SPI_MAX_HZ
help
Value of the SPI max work clock for environment.
config USE_ENV_SPI_MODE
bool "SPI flash mode for environment"
depends on ENV_IS_IN_SPI_FLASH
help
Force the SPI work mode for environment.
config ENV_SPI_MODE
hex "Value of SPI flash work mode for environment"
depends on USE_ENV_SPI_MODE
help
Value of the SPI work mode for environment.
See include/spi.h for value.
config ENV_SPI_EARLY
bool "Access Environment in SPI flashes before relocation"
depends on ENV_IS_IN_SPI_FLASH
help
Enable this if you want to use Environment in SPI flash
before relocation. Call env_init() and than you can use
env_get_f() for accessing Environment variables.
config ENV_IS_IN_UBI
bool "Environment in a UBI volume"
depends on !CHAIN_OF_TRUST
depends on MTD_UBI
depends on CMD_UBI
help
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 SYS_REDUNDAND_ENVIRONMENT
bool "Enable redundant environment support"
help
Normally, the environemt is stored in a single location. By
selecting this option, you can then define where to hold a redundant
copy of the environment data, so that there is a valid backup copy in
case there is a power failure during a "saveenv" operation.
Also this config changes the binary environment structure handling
which is used by env import/export commands which are independent of
storing variables to redundant location on a non volatile device.
config ENV_FAT_INTERFACE
string "Name of the block device for the environment"
depends on ENV_IS_IN_FAT
default "mmc"
help
Define this to a string that is the name of the block device.
config ENV_FAT_DEVICE_AND_PART
string "Device and partition for where to store the environemt in FAT"
depends on ENV_IS_IN_FAT
default "0:1" if TI_COMMON_CMD_OPTIONS
default "0:auto" if ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_VERSAL
default ":auto" if ARCH_SUNXI
default "0" if ARCH_AT91
help
Define this to a string to specify the partition of the device. It can
be as following:
"D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
- "D:P": device D partition P. Error occurs if device D has no
partition table.
- "D:0": device D.
- "D" or "D:": device D partition 1 if device D has partition
table, or the whole device D if has no partition
table.
- "D:auto": first partition in device D with bootable flag set.
If none, first valid partition in device D. If no
partition table then means device D.
If ENV_FAT_INTERFACE is set to "mmc" then device 'D' can be omitted,
leaving the string starting with a colon, and the boot device will
be used.
config ENV_FAT_FILE
string "Name of the FAT file to use for the environment"
depends on ENV_IS_IN_FAT
default "uboot.env"
help
It's a string of the FAT file name. This file use to store the
environment.
config ENV_FAT_FILE_REDUND
string "Name of the FAT file to use for the environment"
depends on ENV_IS_IN_FAT && SYS_REDUNDAND_ENVIRONMENT
default "uboot-redund.env"
help
It's a string of the FAT file name. This file use to store the
redundant environment.
config ENV_EXT4_INTERFACE
string "Name of the block device for the environment"
depends on ENV_IS_IN_EXT4
help
Define this to a string that is the name of the block device.
config ENV_EXT4_DEVICE_AND_PART
string "Device and partition for where to store the environemt in EXT4"
depends on ENV_IS_IN_EXT4
help
Define this to a string to specify the partition of the device. It can
be as following:
"D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
- "D:P": device D partition P. Error occurs if device D has no
partition table.
- "D:0": device D.
- "D" or "D:": device D partition 1 if device D has partition
table, or the whole device D if has no partition
table.
- "D:auto": first partition in device D with bootable flag set.
If none, first valid partition in device D. If no
partition table then means device D.
If ENV_EXT4_INTERFACE is set to "mmc" then device 'D' can be omitted,
leaving the string starting with a colon, and the boot device will
be used.
config ENV_EXT4_FILE
string "Name of the EXT4 file to use for the environment"
depends on ENV_IS_IN_EXT4
default "/uboot.env"
help
It's a string of the EXT4 file name. This file use to store the
environment (explicit path to the file)
config ENV_ADDR
hex "Environment address"
depends on ENV_IS_IN_FLASH || ENV_IS_IN_NVRAM || ENV_IS_IN_ONENAND || \
ENV_IS_IN_REMOTE || ENV_IS_IN_SPI_FLASH
default 0x0 if ENV_IS_IN_SPI_FLASH
help
Offset from the start of the device (or partition)
config ENV_ADDR_REDUND
hex "Redundant environment address"
depends on ENV_IS_IN_FLASH && SYS_REDUNDAND_ENVIRONMENT
help
Offset from the start of the device (or partition) of the redundant
environment location.
config ENV_OFFSET
hex "Environment offset"
depends on ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \
ENV_IS_IN_SPI_FLASH
default 0x3f8000 if ARCH_ROCKCHIP && ENV_IS_IN_MMC
default 0x140000 if ARCH_ROCKCHIP && ENV_IS_IN_SPI_FLASH
default 0x88000 if ARCH_SUNXI
default 0xE0000 if ARCH_ZYNQ
default 0x1E00000 if ARCH_ZYNQMP
default 0x7F40000 if ARCH_VERSAL
default 0 if ARC
default 0x140000 if ARCH_AT91
default 0x260000 if ARCH_OMAP2PLUS
default 0x1080000 if MICROBLAZE && ENV_IS_IN_SPI_FLASH
help
Offset from the start of the device (or partition)
config ENV_OFFSET_REDUND
hex "Redundant environment offset"
depends on (ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \
ENV_IS_IN_SPI_FLASH) && SYS_REDUNDAND_ENVIRONMENT
default 0
help
Offset from the start of the device (or partition) of the redundant
environment location.
config ENV_SIZE
hex "Environment Size"
default 0x40000 if ENV_IS_IN_SPI_FLASH && ARCH_ZYNQMP
default 0x20000 if ARCH_SUNXI || ARCH_ZYNQ || ARCH_OMAP2PLUS || ARCH_AT91
default 0x8000 if ARCH_ROCKCHIP && ENV_IS_IN_MMC
default 0x2000 if ARCH_ROCKCHIP && ENV_IS_IN_SPI_FLASH
default 0x8000 if ARCH_ZYNQMP || ARCH_VERSAL
default 0x4000 if ARC
default 0x1f000
help
Size of the environment storage area
config ENV_SECT_SIZE
hex "Environment Sector-Size"
depends on ENV_IS_IN_FLASH || ENV_IS_IN_SPI_FLASH
default 0x2000 if ARCH_ROCKCHIP
default 0x40000 if ARCH_ZYNQMP || ARCH_VERSAL
default 0x20000 if ARCH_ZYNQ || ARCH_OMAP2PLUS || ARCH_AT91
default 0x20000 if MICROBLAZE && ENV_IS_IN_SPI_FLASH
help
Size of the sector containing the environment.
config ENV_UBI_PART
string "UBI partition name"
depends on ENV_IS_IN_UBI
help
MTD partition containing the UBI device
config ENV_UBI_VOLUME
string "UBI volume name"
depends on ENV_IS_IN_UBI
help
Name of the volume that you want to store the environment in.
config ENV_UBI_VOLUME_REDUND
string "UBI redundant volume name"
depends on ENV_IS_IN_UBI && SYS_REDUNDAND_ENVIRONMENT
help
Name of the redundant volume that you want to store the environment in.
config ENV_UBI_VID_OFFSET
int "ubi environment VID offset"
depends on ENV_IS_IN_UBI
default 0
help
UBI VID offset for environment. If 0, no custom VID offset is used.
config SYS_RELOC_GD_ENV_ADDR
bool "Relocate gd->env_addr"
help
Relocate the early env_addr pointer so we know it is not inside
the binary. Some systems need this and for the rest, it doesn't hurt.
config SYS_MMC_ENV_DEV
int "mmc device number"
depends on ENV_IS_IN_MMC || ENV_IS_IN_FAT || SYS_LS_PPA_FW_IN_MMC || \
CMD_MVEBU_BUBT || FMAN_ENET || QE || PHY_CORTINA
default 0
help
MMC device number on the platform where the environment is stored.
config SYS_MMC_ENV_PART
int "mmc partition number"
depends on ENV_IS_IN_MMC || ENV_IS_IN_FAT
default 0
help
MMC hardware partition device number on the platform where the
environment is stored. Note that this is not related to any software
defined partition table but instead if we are in the user area, which is
partition 0 or the first boot partition, which is 1 or some other defined
partition.
config USE_DEFAULT_ENV_FILE
bool "Create default environment from file"
help
Normally, the default environment is automatically generated
based on the settings of various CONFIG_* options, as well
as the CONFIG_EXTRA_ENV_SETTINGS. By selecting this option,
you can instead define the entire default environment in an
external file.
config DEFAULT_ENV_FILE
string "Path to default environment file"
depends on USE_DEFAULT_ENV_FILE
help
The path containing the default environment. The format is
the same as accepted by the mkenvimage tool: lines
containing key=value pairs, blank lines and lines beginning
with # are ignored.
config ENV_VARS_UBOOT_RUNTIME_CONFIG
bool "Add run-time information to the environment"
help
Enable this in order to add variables describing certain
run-time determined information about the hardware to the
environment. These will be named board_name, board_rev.
config DELAY_ENVIRONMENT
bool "Delay environment loading"
depends on !OF_CONTROL
help
Enable this to inhibit loading the environment during board
initialization. This can address the security risk of untrusted data
being used during boot. Normally the environment is loaded when the
board is initialised so that it is available to U-Boot. This inhibits
that so that the environment is not available until explicitly loaded
later by U-Boot code. With CONFIG_OF_CONTROL this is instead
controlled by the value of /config/load-environment.
config ENV_IMPORT_FDT
bool "Amend environment by FDT properties"
depends on OF_CONTROL
help
If selected, after the environment has been loaded from its
persistent location, the "env_fdt_path" variable is looked
up and used as a path to a node in the control DTB. The
property/value pairs in that node is then used to update the
run-time environment. This can be useful to use the same
U-Boot binary with different board variants.
config ENV_FDT_PATH
string "Default value for env_fdt_path variable"
depends on ENV_IMPORT_FDT
default "/config/environment"
help
The initial value of the env_fdt_path variable.
config ENV_APPEND
bool "Always append the environment with new data"
help
If defined, the environment hash table is only ever appended with new
data, but the existing hash table can never be dropped and reloaded
with newly imported data. This may be used in combination with static
flags to e.g. to protect variables which must not be modified.
config ENV_WRITEABLE_LIST
bool "Permit write access only to listed variables"
help
If defined, only environment variables which explicitly set the 'w'
writeable flag can be written and modified at runtime. No variables
can be otherwise created, written or imported into the environment.
config ENV_ACCESS_IGNORE_FORCE
bool "Block forced environment operations"
help
If defined, don't allow the -f switch to env set override variable
access flags.
if SPL_ENV_SUPPORT
config SPL_ENV_IS_NOWHERE
bool "SPL Environment is not stored"
default y if ENV_IS_NOWHERE
help
Similar to ENV_IS_NOWHERE, used for SPL environment.
config SPL_ENV_IS_IN_MMC
bool "SPL Environment in an MMC device"
depends on !SPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_MMC
default y
help
Similar to ENV_IS_IN_MMC, used for SPL environment.
config SPL_ENV_IS_IN_FAT
bool "SPL Environment is in a FAT filesystem"
depends on !SPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_FAT
default y
help
Similar to ENV_IS_IN_FAT, used for SPL environment.
config SPL_ENV_IS_IN_EXT4
bool "SPL Environment is in a EXT4 filesystem"
depends on !SPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_EXT4
default y
help
Similar to ENV_IS_IN_EXT4, used for SPL environment.
config SPL_ENV_IS_IN_NAND
bool "SPL Environment in a NAND device"
depends on !SPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_NAND
default y
help
Similar to ENV_IS_IN_NAND, used for SPL environment.
config SPL_ENV_IS_IN_SPI_FLASH
bool "SPL Environment is in SPI flash"
depends on !SPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_SPI_FLASH
default y
help
Similar to ENV_IS_IN_SPI_FLASH, used for SPL environment.
config SPL_ENV_IS_IN_FLASH
bool "SPL Environment in flash memory"
depends on !SPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_FLASH
default y
help
Similar to ENV_IS_IN_FLASH, used for SPL environment.
endif
if TPL_ENV_SUPPORT
config TPL_ENV_IS_NOWHERE
bool "TPL Environment is not stored"
default y if ENV_IS_NOWHERE
help
Similar to ENV_IS_NOWHERE, used for TPL environment.
config TPL_ENV_IS_IN_MMC
bool "TPL Environment in an MMC device"
depends on !TPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_MMC
default y
help
Similar to ENV_IS_IN_MMC, used for TPL environment.
config TPL_ENV_IS_IN_FAT
bool "TPL Environment is in a FAT filesystem"
depends on !TPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_FAT
default y
help
Similar to ENV_IS_IN_FAT, used for TPL environment.
config TPL_ENV_IS_IN_EXT4
bool "TPL Environment is in a EXT4 filesystem"
depends on !TPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_EXT4
default y
help
Similar to ENV_IS_IN_EXT4, used for TPL environment.
config TPL_ENV_IS_IN_NAND
bool "TPL Environment in a NAND device"
depends on !TPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_NAND
default y
help
Similar to ENV_IS_IN_NAND, used for TPL environment.
config TPL_ENV_IS_IN_SPI_FLASH
bool "TPL Environment is in SPI flash"
depends on !TPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_SPI_FLASH
default y
help
Similar to ENV_IS_IN_SPI_FLASH, used for TPL environment.
config TPL_ENV_IS_IN_FLASH
bool "TPL Environment in flash memory"
depends on !TPL_ENV_IS_NOWHERE
depends on ENV_IS_IN_FLASH
default y
help
Similar to ENV_IS_IN_FLASH, used for TPL environment.
endif
config VERSION_VARIABLE
bool "Add a 'ver' environment variable with the U-Boot version"
help
If this variable is defined, an environment variable
named "ver" is created by U-Boot showing the U-Boot
version as printed by the "version" command.
Any change to this variable will be reverted at the
next reset.
endmenu
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