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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 1624d1ecd50848e06cc2a5573ef935ab6fbc0f8f / . / boot / Kconfig
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menu "Boot options"
menu "Boot images"
config ANDROID_BOOT_IMAGE
bool "Android Boot Images"
default y if FASTBOOT
help
This enables support for booting images which use the Android
image format header.
config TIMESTAMP
bool "Show image date and time when displaying image information"
default y if CMD_DATE
help
When CONFIG_TIMESTAMP is selected, the timestamp (date and time) of
an image is printed by image commands like bootm or iminfo. This
is shown as 'Timestamp: xxx' and 'Created: xxx'. If this option is
enabled, then U-Boot requires FITs to have a timestamp. If a FIT is
loaded that does not, the message 'Wrong FIT format: no timestamp'
is shown.
config BUTTON_CMD
bool "Support for running a command if a button is held during boot"
depends on CMDLINE
depends on BUTTON
help
For many embedded devices it's useful to enter a special flashing mode
such as fastboot mode when a button is held during boot. This option
allows arbitrary commands to be assigned to specific buttons. These will
be run after "preboot" if the button is held. Configuration is done via
the environment variables "button_cmd_N_name" and "button_cmd_N" where n is
the button number (starting from 0). e.g:
"button_cmd_0_name=vol_down"
"button_cmd_0=fastboot usb 0"
menuconfig FIT
bool "Flattened Image Tree (FIT)"
select HASH
select MD5
select SHA1
imply SHA256
help
This option allows you to boot the new uImage structure,
Flattened Image Tree. FIT is formally a FDT, which can include
images of various types (kernel, FDT blob, ramdisk, etc.)
in a single blob. To boot this new uImage structure,
pass the address of the blob to the "bootm" command.
FIT is very flexible, supporting compression, multiple images,
multiple configurations, verification through hashing and also
verified boot (secure boot using RSA).
if FIT
config FIT_EXTERNAL_OFFSET
hex "FIT external data offset"
default 0x0
help
This specifies a data offset in fit image.
The offset is from data payload offset to the beginning of
fit image header. When specifies a offset, specific data
could be put in the hole between data payload and fit image
header, such as CSF data on i.MX platform.
config FIT_FULL_CHECK
bool "Do a full check of the FIT before using it"
default y
help
Enable this do a full check of the FIT to make sure it is valid. This
helps to protect against carefully crafted FITs which take advantage
of bugs or omissions in the code. This includes a bad structure,
multiple root nodes and the like.
config FIT_SIGNATURE
bool "Enable signature verification of FIT uImages"
depends on DM
select HASH
imply RSA
imply RSA_VERIFY
select IMAGE_SIGN_INFO
select FIT_FULL_CHECK
help
This option enables signature verification of FIT uImages,
using a hash signed and verified using RSA. If
CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
hashing is available using hardware, then the RSA library will use
it. See doc/uImage.FIT/signature.txt for more details.
WARNING: When relying on signed FIT images with a required signature
check the legacy image format is disabled by default, so that
unsigned images cannot be loaded. If a board needs the legacy image
format support in this case, enable it using
CONFIG_LEGACY_IMAGE_FORMAT.
config FIT_SIGNATURE_MAX_SIZE
hex "Max size of signed FIT structures"
depends on FIT_SIGNATURE
default 0x10000000
help
This option sets a max size in bytes for verified FIT uImages.
A sane value of 256MB protects corrupted DTB structures from overlapping
device memory. Assure this size does not extend past expected storage
space.
config FIT_RSASSA_PSS
bool "Support rsassa-pss signature scheme of FIT image contents"
depends on FIT_SIGNATURE
help
Enable this to support the pss padding algorithm as described
in the rfc8017 (https://tools.ietf.org/html/rfc8017).
config FIT_CIPHER
bool "Enable ciphering data in a FIT uImages"
depends on DM
select AES
help
Enable the feature of data ciphering/unciphering in the tool mkimage
and in the u-boot support of the FIT image.
config FIT_VERBOSE
bool "Show verbose messages when FIT images fail"
help
Generally a system will have valid FIT images so debug messages
are a waste of code space. If you are debugging your images then
you can enable this option to get more verbose information about
failures.
config FIT_BEST_MATCH
bool "Select the best match for the kernel device tree"
help
When no configuration is explicitly selected, default to the
one whose fdt's compatibility field best matches that of
U-Boot itself. A match is considered "best" if it matches the
most specific compatibility entry of U-Boot's fdt's root node.
The order of entries in the configuration's fdt is ignored.
config FIT_IMAGE_POST_PROCESS
bool "Enable post-processing of FIT artifacts after loading by U-Boot"
depends on SOCFPGA_SECURE_VAB_AUTH
help
Allows doing any sort of manipulation to blobs after they got extracted
from FIT images like stripping off headers or modifying the size of the
blob, verification, authentication, decryption etc. in a platform or
board specific way. In order to use this feature a platform or board-
specific implementation of board_fit_image_post_process() must be
provided. Also, anything done during this post-processing step would
need to be comprehended in how the images were prepared before being
injected into the FIT creation (i.e. the blobs would have been pre-
processed before being added to the FIT image).
config FIT_PRINT
bool "Support FIT printing"
default y
help
Support printing the content of the fitImage in a verbose manner.
config SPL_FIT
bool "Support Flattened Image Tree within SPL"
depends on SPL
select SPL_HASH
select SPL_OF_LIBFDT
config SPL_FIT_PRINT
bool "Support FIT printing within SPL"
depends on SPL_FIT
help
Support printing the content of the fitImage in a verbose manner in SPL.
config SPL_FIT_FULL_CHECK
bool "Do a full check of the FIT before using it"
depends on SPL_FIT
help
Enable this do a full check of the FIT to make sure it is valid. This
helps to protect against carefully crafted FITs which take advantage
of bugs or omissions in the code. This includes a bad structure,
multiple root nodes and the like.
config SPL_FIT_SIGNATURE
bool "Enable signature verification of FIT firmware within SPL"
depends on SPL_DM
depends on SPL_LOAD_FIT || SPL_LOAD_FIT_FULL
select FIT_SIGNATURE
select SPL_FIT
select SPL_CRYPTO
select SPL_HASH
imply SPL_RSA
imply SPL_RSA_VERIFY
select SPL_IMAGE_SIGN_INFO
select SPL_FIT_FULL_CHECK
config SPL_FIT_SIGNATURE_MAX_SIZE
hex "Max size of signed FIT structures in SPL"
depends on SPL_FIT_SIGNATURE
default 0x10000000
help
This option sets a max size in bytes for verified FIT uImages.
A sane value of 256MB protects corrupted DTB structures from overlapping
device memory. Assure this size does not extend past expected storage
space.
config SPL_FIT_RSASSA_PSS
bool "Support rsassa-pss signature scheme of FIT image contents in SPL"
depends on SPL_FIT_SIGNATURE
help
Enable this to support the pss padding algorithm as described
in the rfc8017 (https://tools.ietf.org/html/rfc8017) in SPL.
config SPL_LOAD_FIT
bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
depends on SPL
select SPL_FIT
help
Normally with the SPL framework a legacy image is generated as part
of the build. This contains U-Boot along with information as to
where it should be loaded. This option instead enables generation
of a FIT (Flat Image Tree) which provides more flexibility. In
particular it can handle selecting from multiple device tree
and passing the correct one to U-Boot.
This path has the following limitations:
1. "loadables" images, other than FDTs, which do not have a "load"
property will not be loaded. This limitation also applies to FPGA
images with the correct "compatible" string.
2. For FPGA images, the supported "compatible" list is in the
doc/uImage.FIT/source_file_format.txt.
3. FDTs are only loaded for images with an "os" property of "u-boot".
"linux" images are also supported with Falcon boot mode.
config SPL_LOAD_FIT_ADDRESS
hex "load address of fit image"
depends on SPL_LOAD_FIT
default 0x0
help
Specify the load address of the fit image that will be loaded
by SPL.
config SPL_LOAD_FIT_APPLY_OVERLAY
bool "Enable SPL applying DT overlays from FIT"
depends on SPL_LOAD_FIT
select OF_LIBFDT_OVERLAY
help
The device tree is loaded from the FIT image. Allow the SPL to
also load device-tree overlays from the FIT image an apply them
over the device tree.
config SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
depends on SPL_LOAD_FIT_APPLY_OVERLAY
default 0x10000
hex "size of temporary buffer used to load the overlays"
help
The size of the area where the overlays will be loaded and
uncompress. Must be at least as large as biggest overlay
(uncompressed)
config SPL_LOAD_FIT_FULL
bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
select SPL_FIT
help
Normally with the SPL framework a legacy image is generated as part
of the build. This contains U-Boot along with information as to
where it should be loaded. This option instead enables generation
of a FIT (Flat Image Tree) which provides more flexibility. In
particular it can handle selecting from multiple device tree
and passing the correct one to U-Boot.
config SPL_FIT_IMAGE_POST_PROCESS
bool "Enable post-processing of FIT artifacts after loading by the SPL"
depends on SPL_LOAD_FIT
default y if TI_SECURE_DEVICE
help
Allows doing any sort of manipulation to blobs after they got extracted
from the U-Boot FIT image like stripping off headers or modifying the
size of the blob, verification, authentication, decryption etc. in a
platform or board specific way. In order to use this feature a platform
or board-specific implementation of board_fit_image_post_process() must
be provided. Also, anything done during this post-processing step would
need to be comprehended in how the images were prepared before being
injected into the FIT creation (i.e. the blobs would have been pre-
processed before being added to the FIT image).
config SPL_FIT_SOURCE
string ".its source file for U-Boot FIT image"
depends on SPL_FIT
help
Specifies a (platform specific) FIT source file to generate the
U-Boot FIT image. This could specify further image to load and/or
execute.
config USE_SPL_FIT_GENERATOR
bool "Use a script to generate the .its script"
depends on SPL_FIT
default y if SPL_FIT && ARCH_ZYNQMP
config SPL_FIT_GENERATOR
string ".its file generator script for U-Boot FIT image"
depends on USE_SPL_FIT_GENERATOR
default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
help
Specifies a (platform specific) script file to generate the FIT
source file used to build the U-Boot FIT image file. This gets
passed a list of supported device tree file stub names to
include in the generated image.
if VPL
config VPL_FIT
bool "Support Flattened Image Tree within VPL"
depends on VPL
default y
select VPL_HASH
select VPL_OF_LIBFDT
config VPL_FIT_PRINT
bool "Support FIT printing within VPL"
depends on VPL_FIT
default y
help
Support printing the content of the fitImage in a verbose manner in VPL.
config VPL_FIT_FULL_CHECK
bool "Do a full check of the FIT before using it"
default y
help
Enable this do a full check of the FIT to make sure it is valid. This
helps to protect against carefully crafted FITs which take advantage
of bugs or omissions in the code. This includes a bad structure,
multiple root nodes and the like.
config VPL_FIT_SIGNATURE
bool "Enable signature verification of FIT firmware within VPL"
depends on VPL_DM
default y
select FIT_SIGNATURE
select VPL_FIT
select VPL_CRYPTO
select VPL_HASH
imply VPL_RSA
imply VPL_RSA_VERIFY
select VPL_IMAGE_SIGN_INFO
select VPL_FIT_FULL_CHECK
config VPL_FIT_SIGNATURE_MAX_SIZE
hex "Max size of signed FIT structures in VPL"
depends on VPL_FIT_SIGNATURE
default 0x10000000
help
This option sets a max size in bytes for verified FIT uImages.
A sane value of 256MB protects corrupted DTB structures from overlapping
device memory. Assure this size does not extend past expected storage
space.
endif # VPL
endif # FIT
config PXE_UTILS
bool
select MENU
help
Utilities for parsing PXE file formats.
config BOOT_DEFAULTS_FEATURES
bool
select SUPPORT_RAW_INITRD
select ENV_VARS_UBOOT_CONFIG
imply USB_STORAGE
imply EFI_PARTITION
imply ISO_PARTITION
config BOOT_DEFAULTS_CMDS
bool
imply USE_BOOTCOMMAND
select CMD_ENV_EXISTS
select CMD_EXT2
select CMD_EXT4
select CMD_FAT
select CMD_FS_GENERIC
select CMD_PART if PARTITIONS
select CMD_DHCP if CMD_NET
select CMD_PING if CMD_NET
select CMD_PXE if CMD_NET
select CMD_BOOTI if ARM64
select CMD_BOOTZ if ARM && !ARM64
imply CMD_MII if NET
config BOOT_DEFAULTS
bool # Common defaults for standard boot and distroboot
select BOOT_DEFAULTS_FEATURES
select BOOT_DEFAULTS_CMDS if CMDLINE
help
These are not required but are commonly needed to support a good
selection of booting methods. Enable this to improve the capability
of U-Boot to boot various images. Currently much functionality is
tied to enabling the command that exercises it.
menuconfig BOOTSTD
bool "Standard boot"
default y
depends on DM && OF_CONTROL && BLK
help
U-Boot supports a standard way of locating something to boot,
typically an Operating System such as Linux, provided by a distro such
as Arch Linux or Debian. Enable this to support iterating through
available bootdevs and using bootmeths to find bootflows suitable for
booting.
Standard boot is not a standard way of booting, just a framework
within U-Boot for supporting all the different ways that exist.
Terminology:
- bootdev - a device which can hold a distro (e.g. MMC)
- bootmeth - a method to scan a bootdev to find bootflows (owned by
U-Boot)
- bootflow - a description of how to boot (owned by the distro)
if BOOTSTD
config SPL_BOOTSTD
bool "Standard boot support in SPL"
depends on SPL && SPL_DM && SPL_OF_CONTROL && SPL_BLK
default y if VPL
help
This enables standard boot in SPL. This is neeeded so that VBE
(Verified Boot for Embedded) can be used, since it depends on standard
boot. It is enabled by default since the main purpose of VPL is to
handle the firmware part of VBE.
config VPL_BOOTSTD
bool "Standard boot support in VPL"
depends on VPL && VPL_DM && VPL_OF_CONTROL && VPL_BLK
default y
help
This enables standard boot in SPL. This is neeeded so that VBE
(Verified Boot for Embedded) can be used, since it depends on standard
boot. It is enabled by default since the main purpose of VPL is to
handle the firmware part of VBE.
config BOOTSTD_FULL
bool "Enhanced features for standard boot"
default y if SANDBOX
imply BOOTSTD_DEFAULTS
help
This enables various useful features for standard boot, which are not
essential for operation:
- bootdev, bootmeth commands
- extra features in the bootflow command
- support for selecting the ordering of bootmeths ("bootmeth order")
- support for selecting the ordering of bootdevs using the devicetree
as well as the "boot_targets" environment variable
config BOOTSTD_DEFAULTS
bool "Select some common defaults for standard boot"
depends on BOOTSTD
select BOOT_DEFAULTS
select BOOTMETH_DISTRO
help
These are not required but are commonly needed to support a good
selection of booting methods. Enable this to improve the capability
of U-Boot to boot various images.
config BOOTSTD_BOOTCOMMAND
bool "Use bootstd to boot"
default y if !DISTRO_DEFAULTS
help
Enable this to select a default boot-command suitable for booting
with standard boot. This can be overridden by the board if needed,
but the default command should be enough for most boards which use
standard boot.
For now this is only selected if distro boot is NOT used, since
standard boot does not support all of the features of distro boot
yet.
config BOOTSTD_PROG
bool "Use programmatic boot"
depends on !CMDLINE
default y
help
Enable this to provide a board_run_command() function which can boot
a systen without using commands. If the boot fails, then U-Boot will
panic.
Note: This currently has many limitations and is not a useful booting
solution. Future work will eventually make this a viable option.
config BOOTMETH_GLOBAL
bool
help
Add support for global bootmeths. This feature is used by VBE and
EFI bootmgr, since they take full control over which bootdevs are
selected to boot.
config BOOTMETH_CROS
bool "Bootdev support for Chromium OS"
depends on X86 || ARM || SANDBOX
default y if !ARM
select EFI_PARTITION
select PARTITION_TYPE_GUID
select PARTITION_UUIDS
help
Enables support for booting Chromium OS using bootdevs. This uses the
kernel A slot and obtains the kernel command line from the parameters
provided there.
Note that only x86 devices are supported at present.
config BOOTMETH_EXTLINUX
bool "Bootdev support for extlinux boot"
select PXE_UTILS
default y
help
Enables support for extlinux boot using bootdevs. This makes the
bootdevs look for a 'extlinux/extlinux.conf' on each filesystem
they scan.
The specification for this filed is here:
https://uapi-group.org/specifications/specs/boot_loader_specification/
This provides a way to try out standard boot on an existing boot flow.
config BOOTMETH_EXTLINUX_PXE
bool "Bootdev support for extlinux boot over network"
depends on CMD_PXE && CMD_NET && DM_ETH
default y
help
Enables support for extlinux boot using bootdevs. This makes the
bootdevs look for a 'extlinux/extlinux.conf' on the tftp server.
The specification for this file is here:
https://uapi-group.org/specifications/specs/boot_loader_specification/
This provides a way to try out standard boot on an existing boot flow.
config BOOTMETH_EFILOADER
bool "Bootdev support for EFI boot"
depends on EFI_BINARY_EXEC
default y
help
Enables support for EFI boot using bootdevs. This makes the
bootdevs look for a 'boot<arch>.efi' on each filesystem
they scan. The resulting file is booted after enabling U-Boot's
EFI loader support.
The <arch> depends on the architecture of the board:
aa64 - aarch64 (ARM 64-bit)
arm - ARM 32-bit
ia32 - x86 32-bit
x64 - x86 64-bit
riscv32 - RISC-V 32-bit
riscv64 - RISC-V 64-bit
This provides a way to try out standard boot on an existing boot flow.
config BOOTMETH_VBE
bool "Bootdev support for Verified Boot for Embedded"
depends on FIT
default y
select BOOTMETH_GLOBAL
select EVENT
help
Enables support for VBE boot. This is a standard boot method which
supports selection of various firmware components, seleciton of an OS to
boot as well as updating these using fwupd.
config BOOTMETH_DISTRO
bool # Options needed to boot any distro
select BOOTMETH_SCRIPT if CMDLINE # E.g. Armbian uses scripts
select BOOTMETH_EXTLINUX # E.g. Debian uses these
select BOOTMETH_EXTLINUX_PXE if CMD_PXE && CMD_NET && DM_ETH
select BOOTMETH_EFILOADER if EFI_BINARY_EXEC # E.g. Ubuntu uses this
config SPL_BOOTMETH_VBE
bool "Bootdev support for Verified Boot for Embedded (SPL)"
depends on SPL && FIT
select EVENT
default y if VPL
help
Enables support for VBE boot. This is a standard boot method which
supports selection of various firmware components, seleciton of an OS to
boot as well as updating these using fwupd.
config VPL_BOOTMETH_VBE
bool "Bootdev support for Verified Boot for Embedded (VPL)"
depends on VPL && FIT
select EVENT
default y
help
Enables support for VBE boot. This is a standard boot method which
supports selection of various firmware components, seleciton of an OS to
boot as well as updating these using fwupd.
if BOOTMETH_VBE
config BOOTMETH_VBE_REQUEST
bool "Support for serving VBE OS requests"
default y
help
Enables support for looking that the requests made by the
Operating System being booted. These requests result in additions to
the device tree /chosen node, added during the device tree fixup
phase.
config SPL_BOOTMETH_VBE_REQUEST
bool "Support for serving VBE OS requests (SPL)"
depends on SPL
help
Enables support for looking that the requests made by the
Operating System being booted. These requests result in additions to
the device tree /chosen node, added during the device tree fixup
phase.
This is only useful if you are booting an OS direct from SPL.
config BOOTMETH_VBE_SIMPLE
bool "Bootdev support for VBE 'simple' method"
default y
help
Enables support for VBE 'simple' boot. This allows updating a single
firmware image in boot media such as MMC. It does not support any sort
of rollback, recovery or A/B boot.
config BOOTMETH_VBE_SIMPLE_OS
bool "Bootdev support for VBE 'simple' method OS phase"
default y
help
Enables support for the OS parts of VBE 'simple' boot. This includes
fixing up the device tree with the required VBE information, ready
for booting into the OS. This option is only enabled for U-Boot
proper, since it is the phase where device tree fixups happen.
config SPL_BOOTMETH_VBE_SIMPLE
bool "Bootdev support for VBE 'simple' method (SPL)"
depends on SPL
default y if VPL
help
Enables support for VBE 'simple' boot. This allows updating a single
firmware image in boot media such as MMC. It does not support any sort
of rollback, recovery or A/B boot.
config VPL_BOOTMETH_VBE_SIMPLE
bool "Bootdev support for VBE 'simple' method (VPL)"
depends on VPL
default y
help
Enables support for VBE 'simple' boot. This allows updating a single
firmware image in boot media such as MMC. It does not support any sort
of rollback, recovery or A/B boot.
config SPL_BOOTMETH_VBE_SIMPLE_FW
bool "Bootdev support for VBE 'simple' method firmware phase (SPL)"
depends on VPL
default y
help
Enables support for the firmware parts of VBE 'simple' boot. This
includes an SPL loader which locates the correct U-Boot to boot into.
This option should really only be enabled for VPL, since it is the
phase where the SPL + U-Boot decision should be made. But for now,
SPL does its own FIT-configuration selection.
config VPL_BOOTMETH_VBE_SIMPLE_FW
bool "Bootdev support for VBE 'simple' method firmware phase (VPL)"
depends on VPL
default y
help
Enables support for the firmware parts of VBE 'simple' boot. This
includes an SPL loader which locates the correct SPL to boot into.
This option enabled for VPL, since it is the phase where the SPL
decision is made.
endif # BOOTMETH_VBE
config EXPO
bool "Support for expos - groups of scenes displaying a UI"
depends on VIDEO
default y if BOOTMETH_VBE
help
An expo is a way of presenting and collecting information from the
user. It consists of a collection of 'scenes' of which only one is
presented at a time. An expo is typically used to show a boot menu
and allow settings to be changed.
The expo can be presented in graphics form using a vidconsole, or in
text form on a serial console.
config BOOTMETH_SANDBOX
def_bool y
depends on SANDBOX
help
This is a sandbox bootmeth driver used for testing. It always returns
-ENOTSUPP when attempting to boot.
config BOOTMETH_SCRIPT
bool "Bootdev support for U-Boot scripts"
default y if BOOTSTD_FULL
depends on CMDLINE
select HUSH_PARSER
help
Enables support for booting a distro via a U-Boot script. This makes
the bootdevs look for a 'boot/boot.scr' file which can be used to
boot the distro.
This provides a way to try out standard boot on an existing boot flow.
It is not enabled by default to save space.
endif # BOOTSTD
config LEGACY_IMAGE_FORMAT
bool "Enable support for the legacy image format"
default y if !FIT_SIGNATURE && !TI_SECURE_DEVICE
help
This option enables the legacy image format. It is enabled by
default for backward compatibility, unless FIT_SIGNATURE is
set where it is disabled so that unsigned images cannot be
loaded. If a board needs the legacy image format support in this
case, enable it here.
config MEASURED_BOOT
bool "Measure boot images and configuration when booting without EFI"
depends on HASH && TPM_V2
help
This option enables measurement of the boot process when booting
without UEFI . Measurement involves creating cryptographic hashes
of the binary images that are booting and storing them in the TPM.
In addition, a log of these hashes is stored in memory for the OS
to verify the booted images and configuration. Enable this if the
OS has configured some memory area for the event log and you intend
to use some attestation tools on your system.
if MEASURED_BOOT
config MEASURE_DEVICETREE
bool "Measure the devicetree image"
default y if MEASURED_BOOT
help
On some platforms, the devicetree is not static as it may contain
random MAC addresses or other such data that changes each boot.
Therefore, it should not be measured into the TPM. In that case,
disable the measurement here.
config MEASURE_IGNORE_LOG
bool "Ignore the existing event log"
default n
help
On platforms that use an event log memory region that persists
through system resets and are the first stage bootloader, then
this option should be enabled to ignore any existing data in the
event log memory region.
endif # MEASURED_BOOT
config SYS_BOOTM_LEN
hex "Maximum size of a decompresed OS image"
depends on CMD_BOOTM || CMD_BOOTI || CMD_BOOTZ || \
LEGACY_IMAGE_FORMAT || SPL_LEGACY_IMAGE_FORMAT
default 0x4000000 if PPC || ARM64
default 0x1000000 if X86 || ARCH_MX6 || ARCH_MX7
default 0x800000
help
This is the maximum size of the buffer that is used to decompress the OS
image in to if attempting to boot a compressed image.
config SUPPORT_RAW_INITRD
bool "Enable raw initrd images"
help
Note, defining the SUPPORT_RAW_INITRD allows user to supply
kernel with raw initrd images. The syntax is slightly different, the
address of the initrd must be augmented by it's size, in the following
format: "<initrd address>:<initrd size>".
config CHROMEOS
bool "Support booting Chrome OS"
help
Chrome OS requires U-Boot to set up a table indicating the boot mode
(e.g. Developer mode) and a few other things. Enable this if you are
booting on a Chromebook to avoid getting an error about an invalid
firmware ID.
config CHROMEOS_VBOOT
bool "Support Chrome OS verified boot"
help
This is intended to enable the full Chrome OS verified boot support
in U-Boot. It is not actually implemented in the U-Boot source code
at present, so this option is always set to 'n'. It allows
distinguishing between booting Chrome OS in a basic way (developer
mode) and a full boot.
config SYS_RAMBOOT
bool
config RAMBOOT_PBL
bool "Freescale PBL(pre-boot loader) image format support"
select SYS_RAMBOOT if PPC
help
Some SoCs use PBL to load RCW and/or pre-initialization instructions.
For more details refer to doc/README.pblimage
choice
prompt "Freescale PBL (or predecessor) load location"
depends on RAMBOOT_PBL || ((TARGET_P1010RDB_PA || TARGET_P1010RDB_PB \
|| TARGET_P1020RDB_PC || TARGET_P1020RDB_PD || TARGET_P2020RDB) \
&& !CMD_NAND)
config SDCARD
bool "Freescale PBL (or similar) is found on SD card"
config SPIFLASH
bool "Freescale PBL (or similar) is found on SPI flash"
config NO_PBL
bool "Freescale PBL (or similar) is not used in this case"
endchoice
config FSL_FIXED_MMC_LOCATION
bool "PBL MMC is at a fixed location"
depends on SDCARD && !RAMBOOT_PBL
config ESDHC_HC_BLK_ADDR
def_bool y
depends on FSL_FIXED_MMC_LOCATION && (ARCH_BSC9131 || ARCH_BSC9132 || ARCH_P1010)
help
In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and
code length of these soc specify the memory address in block address
format. Block length is fixed to 512 bytes as per the SD High
Capacity specification.
config SYS_FSL_PBL_PBI
string "PBI(pre-boot instructions) commands for the PBL image"
depends on RAMBOOT_PBL
help
PBI commands can be used to configure SoC before it starts the execution.
Please refer doc/README.pblimage for more details.
config SYS_FSL_PBL_RCW
string "Aadditional RCW (Power on reset configuration) for the PBL image"
depends on RAMBOOT_PBL
help
Enables addition of RCW (Power on reset configuration) in built image.
Please refer doc/README.pblimage for more details.
config SYS_BOOT_RAMDISK_HIGH
depends on CMD_BOOTM || CMD_BOOTI || CMD_BOOTZ
depends on !(NIOS2 || SANDBOX || SH || XTENSA)
def_bool y
select LMB
help
Enable initrd_high functionality. If defined then the initrd_high
feature is enabled and the boot* ramdisk subcommand is enabled.
endmenu # Boot images
config DISTRO_DEFAULTS
bool "(deprecated) Script-based booting of Linux distributions"
select CMDLINE
select BOOT_DEFAULTS
select AUTO_COMPLETE
select CMDLINE_EDITING
select CMD_SYSBOOT
select HUSH_PARSER
select SYS_LONGHELP
help
Note: These scripts have been replaced by Standard Boot. Do not use
them on new boards. See 'Migrating from distro_boot' at
doc/develop/bootstd.rst
Select this to enable various options and commands which are suitable
for building u-boot for booting general purpose Linux distributions.
menu "Boot timing"
config BOOTSTAGE
bool "Boot timing and reporting"
help
Enable recording of boot time while booting. To use it, insert
calls to bootstage_mark() with a suitable BOOTSTAGE_ID from
bootstage.h. Only a single entry is recorded for each ID. You can
give the entry a name with bootstage_mark_name(). You can also
record elapsed time in a particular stage using bootstage_start()
before starting and bootstage_accum() when finished. Bootstage will
add up all the accumulated time and report it.
Normally, IDs are defined in bootstage.h but a small number of
additional 'user' IDs can be used by passing BOOTSTAGE_ID_ALLOC
as the ID.
Calls to show_boot_progress() will also result in log entries but
these will not have names.
config SPL_BOOTSTAGE
bool "Boot timing and reported in SPL"
depends on BOOTSTAGE && SPL
help
Enable recording of boot time in SPL. To make this visible to U-Boot
proper, enable BOOTSTAGE_STASH as well. This will stash the timing
information when SPL finishes and load it when U-Boot proper starts
up.
config TPL_BOOTSTAGE
bool "Boot timing and reported in TPL"
depends on BOOTSTAGE && TPL
help
Enable recording of boot time in SPL. To make this visible to U-Boot
proper, enable BOOTSTAGE_STASH as well. This will stash the timing
information when TPL finishes and load it when U-Boot proper starts
up.
config BOOTSTAGE_REPORT
bool "Display a detailed boot timing report before booting the OS"
depends on BOOTSTAGE
help
Enable output of a boot time report just before the OS is booted.
This shows how long it took U-Boot to go through each stage of the
boot process. The report looks something like this:
Timer summary in microseconds:
Mark Elapsed Stage
0 0 reset
3,575,678 3,575,678 board_init_f start
3,575,695 17 arch_cpu_init A9
3,575,777 82 arch_cpu_init done
3,659,598 83,821 board_init_r start
3,910,375 250,777 main_loop
29,916,167 26,005,792 bootm_start
30,361,327 445,160 start_kernel
config BOOTSTAGE_RECORD_COUNT
int "Number of boot stage records to store"
depends on BOOTSTAGE
default 30
help
This is the size of the bootstage record list and is the maximum
number of bootstage records that can be recorded.
config SPL_BOOTSTAGE_RECORD_COUNT
int "Number of boot stage records to store for SPL"
depends on SPL_BOOTSTAGE
default 5
help
This is the size of the bootstage record list and is the maximum
number of bootstage records that can be recorded.
config TPL_BOOTSTAGE_RECORD_COUNT
int "Number of boot stage records to store for TPL"
depends on TPL_BOOTSTAGE
default 5
help
This is the size of the bootstage record list and is the maximum
number of bootstage records that can be recorded.
config BOOTSTAGE_FDT
bool "Store boot timing information in the OS device tree"
depends on BOOTSTAGE
help
Stash the bootstage information in the FDT. A root 'bootstage'
node is created with each bootstage id as a child. Each child
has a 'name' property and either 'mark' containing the
mark time in microseconds, or 'accum' containing the
accumulated time for that bootstage id in microseconds.
For example:
bootstage {
154 {
name = "board_init_f";
mark = <3575678>;
};
170 {
name = "lcd";
accum = <33482>;
};
};
Code in the Linux kernel can find this in /proc/devicetree.
config BOOTSTAGE_STASH
bool "Stash the boot timing information in memory before booting OS"
depends on BOOTSTAGE
help
Some OSes do not support device tree. Bootstage can instead write
the boot timing information in a binary format at a given address.
This happens through a call to bootstage_stash(), typically in
the CPU's cleanup_before_linux() function. You can use the
'bootstage stash' and 'bootstage unstash' commands to do this on
the command line.
config BOOTSTAGE_STASH_ADDR
hex "Address to stash boot timing information"
default 0x0
help
Provide an address which will not be overwritten by the OS when it
starts, so that it can read this information when ready.
config BOOTSTAGE_STASH_SIZE
hex "Size of boot timing stash region"
default 0x1000
help
This should be large enough to hold the bootstage stash. A value of
4096 (4KiB) is normally plenty.
config SHOW_BOOT_PROGRESS
bool "Show boot progress in a board-specific manner"
help
Defining this option allows to add some board-specific code (calling
a user-provided function show_boot_progress(int) that enables you to
show the system's boot progress on some display (for example, some
LEDs) on your board. At the moment, the following checkpoints are
implemented:
Legacy uImage format:
Arg Where When
1 common/cmd_bootm.c before attempting to boot an image
-1 common/cmd_bootm.c Image header has bad magic number
2 common/cmd_bootm.c Image header has correct magic number
-2 common/cmd_bootm.c Image header has bad checksum
3 common/cmd_bootm.c Image header has correct checksum
-3 common/cmd_bootm.c Image data has bad checksum
4 common/cmd_bootm.c Image data has correct checksum
-4 common/cmd_bootm.c Image is for unsupported architecture
5 common/cmd_bootm.c Architecture check OK
-5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
6 common/cmd_bootm.c Image Type check OK
-6 common/cmd_bootm.c gunzip uncompression error
-7 common/cmd_bootm.c Unimplemented compression type
7 common/cmd_bootm.c Uncompression OK
8 common/cmd_bootm.c No uncompress/copy overwrite error
-9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
9 common/image.c Start initial ramdisk verification
-10 common/image.c Ramdisk header has bad magic number
-11 common/image.c Ramdisk header has bad checksum
10 common/image.c Ramdisk header is OK
-12 common/image.c Ramdisk data has bad checksum
11 common/image.c Ramdisk data has correct checksum
12 common/image.c Ramdisk verification complete, start loading
-13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
13 common/image.c Start multifile image verification
14 common/image.c No initial ramdisk, no multifile, continue.
15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
-30 arch/powerpc/lib/board.c Fatal error, hang the system
-31 post/post.c POST test failed, detected by post_output_backlog()
-32 post/post.c POST test failed, detected by post_run_single()
34 common/cmd_doc.c before loading a Image from a DOC device
-35 common/cmd_doc.c Bad usage of "doc" command
35 common/cmd_doc.c correct usage of "doc" command
-36 common/cmd_doc.c No boot device
36 common/cmd_doc.c correct boot device
-37 common/cmd_doc.c Unknown Chip ID on boot device
37 common/cmd_doc.c correct chip ID found, device available
-38 common/cmd_doc.c Read Error on boot device
38 common/cmd_doc.c reading Image header from DOC device OK
-39 common/cmd_doc.c Image header has bad magic number
39 common/cmd_doc.c Image header has correct magic number
-40 common/cmd_doc.c Error reading Image from DOC device
40 common/cmd_doc.c Image header has correct magic number
41 common/cmd_ide.c before loading a Image from a IDE device
-42 common/cmd_ide.c Bad usage of "ide" command
42 common/cmd_ide.c correct usage of "ide" command
-43 common/cmd_ide.c No boot device
43 common/cmd_ide.c boot device found
-44 common/cmd_ide.c Device not available
44 common/cmd_ide.c Device available
-45 common/cmd_ide.c wrong partition selected
45 common/cmd_ide.c partition selected
-46 common/cmd_ide.c Unknown partition table
46 common/cmd_ide.c valid partition table found
-47 common/cmd_ide.c Invalid partition type
47 common/cmd_ide.c correct partition type
-48 common/cmd_ide.c Error reading Image Header on boot device
48 common/cmd_ide.c reading Image Header from IDE device OK
-49 common/cmd_ide.c Image header has bad magic number
49 common/cmd_ide.c Image header has correct magic number
-50 common/cmd_ide.c Image header has bad checksum
50 common/cmd_ide.c Image header has correct checksum
-51 common/cmd_ide.c Error reading Image from IDE device
51 common/cmd_ide.c reading Image from IDE device OK
52 common/cmd_nand.c before loading a Image from a NAND device
-53 common/cmd_nand.c Bad usage of "nand" command
53 common/cmd_nand.c correct usage of "nand" command
-54 common/cmd_nand.c No boot device
54 common/cmd_nand.c boot device found
-55 common/cmd_nand.c Unknown Chip ID on boot device
55 common/cmd_nand.c correct chip ID found, device available
-56 common/cmd_nand.c Error reading Image Header on boot device
56 common/cmd_nand.c reading Image Header from NAND device OK
-57 common/cmd_nand.c Image header has bad magic number
57 common/cmd_nand.c Image header has correct magic number
-58 common/cmd_nand.c Error reading Image from NAND device
58 common/cmd_nand.c reading Image from NAND device OK
-60 common/env_common.c Environment has a bad CRC, using default
64 net/eth.c starting with Ethernet configuration.
-64 net/eth.c no Ethernet found.
65 net/eth.c Ethernet found.
-80 common/cmd_net.c usage wrong
80 common/cmd_net.c before calling net_loop()
-81 common/cmd_net.c some error in net_loop() occurred
81 common/cmd_net.c net_loop() back without error
-82 common/cmd_net.c size == 0 (File with size 0 loaded)
82 common/cmd_net.c trying automatic boot
83 common/cmd_net.c running "source" command
-83 common/cmd_net.c some error in automatic boot or "source" command
84 common/cmd_net.c end without errors
FIT uImage format:
Arg Where When
100 common/cmd_bootm.c Kernel FIT Image has correct format
-100 common/cmd_bootm.c Kernel FIT Image has incorrect format
101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
-101 common/cmd_bootm.c Can't get configuration for kernel subimage
102 common/cmd_bootm.c Kernel unit name specified
-103 common/cmd_bootm.c Can't get kernel subimage node offset
103 common/cmd_bootm.c Found configuration node
104 common/cmd_bootm.c Got kernel subimage node offset
-104 common/cmd_bootm.c Kernel subimage hash verification failed
105 common/cmd_bootm.c Kernel subimage hash verification OK
-105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
106 common/cmd_bootm.c Architecture check OK
-106 common/cmd_bootm.c Kernel subimage has wrong type
107 common/cmd_bootm.c Kernel subimage type OK
-107 common/cmd_bootm.c Can't get kernel subimage data/size
108 common/cmd_bootm.c Got kernel subimage data/size
-108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
-109 common/cmd_bootm.c Can't get kernel subimage type
-110 common/cmd_bootm.c Can't get kernel subimage comp
-111 common/cmd_bootm.c Can't get kernel subimage os
-112 common/cmd_bootm.c Can't get kernel subimage load address
-113 common/cmd_bootm.c Image uncompress/copy overwrite error
120 common/image.c Start initial ramdisk verification
-120 common/image.c Ramdisk FIT image has incorrect format
121 common/image.c Ramdisk FIT image has correct format
122 common/image.c No ramdisk subimage unit name, using configuration
-122 common/image.c Can't get configuration for ramdisk subimage
123 common/image.c Ramdisk unit name specified
-124 common/image.c Can't get ramdisk subimage node offset
125 common/image.c Got ramdisk subimage node offset
-125 common/image.c Ramdisk subimage hash verification failed
126 common/image.c Ramdisk subimage hash verification OK
-126 common/image.c Ramdisk subimage for unsupported architecture
127 common/image.c Architecture check OK
-127 common/image.c Can't get ramdisk subimage data/size
128 common/image.c Got ramdisk subimage data/size
129 common/image.c Can't get ramdisk load address
-129 common/image.c Got ramdisk load address
-130 common/cmd_doc.c Incorrect FIT image format
131 common/cmd_doc.c FIT image format OK
-140 common/cmd_ide.c Incorrect FIT image format
141 common/cmd_ide.c FIT image format OK
-150 common/cmd_nand.c Incorrect FIT image format
151 common/cmd_nand.c FIT image format OK
config SPL_SHOW_BOOT_PROGRESS
bool "Show boot progress in a board-specific manner in SPL"
depends on SPL
help
Defining this option allows to add some board-specific code (calling
a user-provided function show_boot_progress(int) that enables you to
show the system's boot progress on some display (for example, some
LEDs) on your board. For details see SHOW_BOOT_PROGRESS.
endmenu
menu "Boot media"
config NOR_BOOT
bool "Support for booting from NOR flash"
depends on NOR
help
Enabling this will make a U-Boot binary that is capable of being
booted via NOR. In this case we will enable certain pinmux early
as the ROM only partially sets up pinmux. We also default to using
NOR for environment.
config NAND_BOOT
bool "Support for booting from NAND flash"
imply MTD_RAW_NAND
help
Enabling this will make a U-Boot binary that is capable of being
booted via NAND flash. This is not a must, some SoCs need this,
some not.
config ONENAND_BOOT
bool "Support for booting from ONENAND"
imply MTD_RAW_NAND
help
Enabling this will make a U-Boot binary that is capable of being
booted via ONENAND. This is not a must, some SoCs need this,
some not.
config QSPI_BOOT
bool "Support for booting from QSPI flash"
help
Enabling this will make a U-Boot binary that is capable of being
booted via QSPI flash. This is not a must, some SoCs need this,
some not.
config SATA_BOOT
bool "Support for booting from SATA"
help
Enabling this will make a U-Boot binary that is capable of being
booted via SATA. This is not a must, some SoCs need this,
some not.
config SD_BOOT
bool "Support for booting from SD/EMMC"
help
Enabling this will make a U-Boot binary that is capable of being
booted via SD/EMMC. This is not a must, some SoCs need this,
some not.
config SD_BOOT_QSPI
bool "Support for booting from SD/EMMC and enable QSPI"
help
Enabling this will make a U-Boot binary that is capable of being
booted via SD/EMMC while enabling QSPI on the platform as well. This
is not a must, some SoCs need this, some not.
config SPI_BOOT
bool "Support for booting from SPI flash"
help
Enabling this will make a U-Boot binary that is capable of being
booted via SPI flash. This is not a must, some SoCs need this,
some not.
endmenu
menu "Autoboot options"
config AUTOBOOT
bool "Autoboot"
depends on CMDLINE
default y
help
This enables the autoboot. See doc/README.autoboot for detail.
if AUTOBOOT
config BOOTDELAY
int "delay in seconds before automatically booting"
default 2
help
Delay before automatically running bootcmd;
set to 0 to autoboot with no delay, but you can stop it by key input.
set to -1 to disable autoboot.
set to -2 to autoboot with no delay and not check for abort
If this value is >= 0 then it is also used for the default delay
before starting the default entry in bootmenu. If it is < 0 then
a default value of 10s is used.
See doc/README.autoboot for details.
config AUTOBOOT_KEYED
bool "Stop autobooting via specific input key / string"
help
This option enables stopping (aborting) of the automatic
boot feature only by issuing a specific input key or
string. If not enabled, any input key will abort the
U-Boot automatic booting process and bring the device
to the U-Boot prompt for user input.
if AUTOBOOT_KEYED
config AUTOBOOT_FLUSH_STDIN
bool "Enable flushing stdin before starting to read the password"
depends on !SANDBOX
help
When this option is enabled stdin buffer will be flushed before
starting to read the password.
This can't be enabled for the sandbox as flushing stdin would
break the autoboot unit tests.
config AUTOBOOT_PROMPT
string "Autoboot stop prompt"
default "Autoboot in %d seconds\\n"
help
This string is displayed before the boot delay selected by
CONFIG_BOOTDELAY starts. If it is not defined there is no
output indicating that autoboot is in progress.
Note that this define is used as the (only) argument to a
printf() call, so it may contain '%' format specifications,
provided that it also includes, sepearated by commas exactly
like in a printf statement, the required arguments. It is
the responsibility of the user to select only such arguments
that are valid in the given context.
config AUTOBOOT_ENCRYPTION
bool "Enable encryption in autoboot stopping"
help
This option allows a string to be entered into U-Boot to stop the
autoboot.
The behavior depends whether CONFIG_CRYPT_PW from lib is enabled
or not.
In case CONFIG_CRYPT_PW is enabled, the string will be forwarded
to the crypt-based functionality and be compared against the
string in the environment variable 'bootstopkeycrypt'.
In case CONFIG_CRYPT_PW is disabled the string itself is hashed
and compared against the hash in the environment variable
'bootstopkeysha256'.
If it matches in either case then boot stops and
a command-line prompt is presented.
This provides a way to ship a secure production device which can also
be accessed at the U-Boot command line.
config AUTOBOOT_SHA256_FALLBACK
bool "Allow fallback from crypt-hashed password to sha256"
depends on AUTOBOOT_ENCRYPTION && CRYPT_PW
help
This option adds support to fall back from crypt-hashed
passwords to checking a SHA256 hashed password in case the
'bootstopusesha256' environment variable is set to 'true'.
config AUTOBOOT_DELAY_STR
string "Delay autobooting via specific input key / string"
depends on !AUTOBOOT_ENCRYPTION
help
This option delays the automatic boot feature by issuing
a specific input key or string. If CONFIG_AUTOBOOT_DELAY_STR
or the environment variable "bootdelaykey" is specified
and this string is received from console input before
autoboot starts booting, U-Boot gives a command prompt. The
U-Boot prompt will time out if CONFIG_BOOT_RETRY_TIME is
used, otherwise it never times out.
config AUTOBOOT_STOP_STR
string "Stop autobooting via specific input key / string"
depends on !AUTOBOOT_ENCRYPTION
help
This option enables stopping (aborting) of the automatic
boot feature only by issuing a specific input key or
string. If CONFIG_AUTOBOOT_STOP_STR or the environment
variable "bootstopkey" is specified and this string is
received from console input before autoboot starts booting,
U-Boot gives a command prompt. The U-Boot prompt never
times out, even if CONFIG_BOOT_RETRY_TIME is used.
config AUTOBOOT_KEYED_CTRLC
bool "Enable Ctrl-C autoboot interruption"
depends on !AUTOBOOT_ENCRYPTION
help
This option allows for the boot sequence to be interrupted
by ctrl-c, in addition to the "bootdelaykey" and "bootstopkey".
Setting this variable provides an escape sequence from the
limited "password" strings.
config AUTOBOOT_NEVER_TIMEOUT
bool "Make the password entry never time-out"
depends on AUTOBOOT_ENCRYPTION && CRYPT_PW
help
This option removes the timeout from the password entry
when the user first presses the <Enter> key before entering
any other character.
config AUTOBOOT_STOP_STR_ENABLE
bool "Enable fixed string to stop autobooting"
depends on AUTOBOOT_ENCRYPTION
help
This option enables the feature to add a fixed stop
string that is defined at compile time.
In every case it will be tried to load the stop
string from the environment.
In case this is enabled and there is no stop string
in the environment, this will be used as default value.
config AUTOBOOT_STOP_STR_CRYPT
string "Stop autobooting via crypt-hashed password"
depends on AUTOBOOT_STOP_STR_ENABLE && CRYPT_PW
help
This option adds the feature to only stop the autobooting,
and therefore boot into the U-Boot prompt, when the input
string / password matches a values that is hashed via
one of the supported crypt-style password hashing options
and saved in the environment variable "bootstopkeycrypt".
config AUTOBOOT_STOP_STR_SHA256
string "Stop autobooting via SHA256 hashed password"
depends on AUTOBOOT_STOP_STR_ENABLE
help
This option adds the feature to only stop the autobooting,
and therefore boot into the U-Boot prompt, when the input
string / password matches a values that is encypted via
a SHA256 hash and saved in the environment variable
"bootstopkeysha256". If the value in that variable
includes a ":", the portion prior to the ":" will be treated
as a salt value.
endif # AUTOBOOT_KEYED
if !AUTOBOOT_KEYED
config AUTOBOOT_USE_MENUKEY
bool "Allow a specify key to run a menu from the environment"
help
If a specific key is pressed to stop autoboot, then the commands in
the environment variable 'menucmd' are executed before boot starts.
config AUTOBOOT_MENUKEY
int "ASCII value of boot key to show a menu"
default 0
depends on AUTOBOOT_USE_MENUKEY
help
If this key is pressed to stop autoboot, then the commands in the
environment variable 'menucmd' will be executed before boot starts.
For example, 33 means "!" in ASCII, so pressing ! at boot would take
this action.
endif
endif # AUTOBOOT
config AUTOBOOT_MENU_SHOW
bool "Show a menu on boot"
depends on CMD_BOOTMENU
help
This enables the boot menu, controlled by environment variables
defined by the board. The menu starts after running the 'preboot'
environmnent variable (if enabled) and before handling the boot delay.
See doc/usage/cmd/bootmenu.rst for more details.
config BOOTMENU_DISABLE_UBOOT_CONSOLE
bool "Disallow bootmenu to enter the U-Boot console"
depends on AUTOBOOT_MENU_SHOW
help
If this option is enabled, user can not enter the U-Boot console from
bootmenu. It increases the system security.
config BOOT_RETRY
bool "Boot retry feature"
help
Allow for having the U-Boot command prompt time out and attempt
to boot again. If the environment variable "bootretry" is found then
its value is used, otherwise the retry timeout is
CONFIG_BOOT_RETRY_TIME. CONFIG_BOOT_RETRY_MIN is optional and
defaults to CONFIG_BOOT_RETRY_TIME. All times are in seconds.
config BOOT_RETRY_TIME
int "Timeout in seconds before attempting to boot again"
depends on BOOT_RETRY
help
Time in seconds before the U-Boot prompt will timeout and boot will
be attempted again.
config BOOT_RETRY_MIN
int "Minimum timeout in seconds for 'bootretry'"
depends on BOOT_RETRY
default BOOT_RETRY_TIME
help
The minimum time in seconds that "bootretry" can be set to.
config RESET_TO_RETRY
bool "Reset the board to retry autoboot"
depends on BOOT_RETRY
help
After the countdown timed out, the board will be reset to restart
again.
endmenu
menu "Image support"
config IMAGE_PRE_LOAD
bool "Image pre-load support"
help
Enable an image pre-load stage in the SPL.
This pre-load stage allows to do some manipulation
or check (for example signature check) on an image
before launching it.
config SPL_IMAGE_PRE_LOAD
bool "Image pre-load support within SPL"
depends on SPL && IMAGE_PRE_LOAD
help
Enable an image pre-load stage in the SPL.
This pre-load stage allows to do some manipulation
or check (for example signature check) on an image
before launching it.
config IMAGE_PRE_LOAD_SIG
bool "Image pre-load signature support"
depends on IMAGE_PRE_LOAD
select FIT_SIGNATURE
select RSA
select RSA_VERIFY_WITH_PKEY
help
Enable signature check support in the pre-load stage.
For this feature a very simple header is added before
the image with few fields:
- a magic
- the image size
- the signature
All other information (header size, type of signature,
...) are provided in the node /image/pre-load/sig of
u-boot.
config SPL_IMAGE_PRE_LOAD_SIG
bool "Image pre-load signature support witin SPL"
depends on SPL_IMAGE_PRE_LOAD && IMAGE_PRE_LOAD_SIG
select SPL_FIT_SIGNATURE
select SPL_RSA
select SPL_RSA_VERIFY_WITH_PKEY
help
Enable signature check support in the pre-load stage in the SPL.
For this feature a very simple header is added before
the image with few fields:
- a magic
- the image size
- the signature
All other information (header size, type of signature,
...) are provided in the node /image/pre-load/sig of
u-boot.
endmenu
if OF_LIBFDT
menu "Devicetree fixup"
config OF_ENV_SETUP
bool "Run a command from environment to set up device tree before boot"
depends on CMD_FDT
help
This causes U-Boot to run a command from the environment variable
fdt_fixup before booting into the operating system, which can use the
fdt command to modify the device tree. The device tree is then passed
to the OS.
config OF_BOARD_SETUP
bool "Set up board-specific details in device tree before boot"
help
This causes U-Boot to call ft_board_setup() before booting into
the Operating System. This function can set up various
board-specific information in the device tree for use by the OS.
The device tree is then passed to the OS.
config OF_SYSTEM_SETUP
bool "Set up system-specific details in device tree before boot"
help
This causes U-Boot to call ft_system_setup() before booting into
the Operating System. This function can set up various
system-specific information in the device tree for use by the OS.
The device tree is then passed to the OS.
config OF_STDOUT_VIA_ALIAS
bool "Update the device-tree stdout alias from U-Boot"
help
This uses U-Boot's serial alias from the aliases node to update
the device tree passed to the OS. The "linux,stdout-path" property
in the chosen node is set to point to the correct serial node.
This option currently references CONFIG_CONS_INDEX, which is
incorrect when used with device tree as this option does not
exist / should not be used.
config FDT_FIXUP_PARTITIONS
bool "Overwrite MTD partitions in DTS through defined in 'mtdparts'"
help
Allow overwriting defined partitions in the device tree blob
using partition info defined in the 'mtdparts' environment
variable.
config FDT_SIMPLEFB
bool "FDT tools for simplefb support"
help
Enable the fdt tools to manage the simple fb nodes in device tree.
These functions can be used by board to indicate to the OS
the presence of the simple frame buffer with associated reserved
memory
config ARCH_FIXUP_FDT_MEMORY
bool "Enable arch_fixup_memory_banks() call"
default y
help
Enable FDT memory map syncup before OS boot. This feature can be
used for booting OS with different memory setup where the part of
the memory location should be used for different purpose.
endmenu
endif # OF_LIBFDT
config USE_BOOTARGS
bool "Enable boot arguments"
help
Provide boot arguments to bootm command. Boot arguments are specified
in CONFIG_BOOTARGS option. Enable this option to be able to specify
CONFIG_BOOTARGS string. If this option is disabled, CONFIG_BOOTARGS
will be undefined and won't take any space in U-Boot image.
config BOOTARGS
string "Boot arguments"
depends on USE_BOOTARGS && !USE_DEFAULT_ENV_FILE
help
This can be used to pass arguments to the bootm command. The value of
CONFIG_BOOTARGS goes into the environment value "bootargs". Note that
this value will also override the "chosen" node in FDT blob.
config BOOTARGS_SUBST
bool "Support substituting strings in boot arguments"
help
This allows substituting string values in the boot arguments. These
are applied after the commandline has been built.
One use for this is to insert the root-disk UUID into the command
line where bootargs contains "root=${uuid}"
setenv bootargs "console= root=${uuid}"
# Set the 'uuid' environment variable
part uuid mmc 2:2 uuid
# Command-line substitution will put the real uuid into the
# kernel command line
bootm
config USE_BOOTCOMMAND
bool "Enable a default value for bootcmd"
depends on CMDLINE
help
Provide a default value for the bootcmd entry in the environment. If
autoboot is enabled this is what will be run automatically. Enable
this option to be able to specify CONFIG_BOOTCOMMAND as a string. If
this option is disabled, CONFIG_BOOTCOMMAND will be undefined and
won't take any space in U-Boot image.
config BOOTCOMMAND
string "bootcmd value"
depends on USE_BOOTCOMMAND && !USE_DEFAULT_ENV_FILE
default "bootflow scan -lb" if BOOTSTD_DEFAULTS && CMD_BOOTFLOW_FULL
default "bootflow scan" if BOOTSTD_DEFAULTS && !CMD_BOOTFLOW_FULL
default "run distro_bootcmd" if !BOOTSTD_BOOTCOMMAND && DISTRO_DEFAULTS
help
This is the string of commands that will be used as bootcmd and if
AUTOBOOT is set, automatically run.
config USE_PREBOOT
bool "Enable preboot"
depends on CMDLINE
help
When this option is enabled, 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 example, the boot code can modify the
"preboot" when a user holds down a certain combination of keys.
config PREBOOT
string "preboot default value"
depends on USE_PREBOOT && !USE_DEFAULT_ENV_FILE
default "usb start" if USB_KEYBOARD
default ""
help
This is the default of "preboot" environment variable.
config PREBOOT_DEFINED
bool
default y if PREBOOT != ""
config DEFAULT_FDT_FILE
string "Default fdt file"
help
This option is used to set the default fdt file to boot OS.
config SAVE_PREV_BL_FDT_ADDR
depends on ARM
bool "Saves fdt address, passed by the previous bootloader, to env var"
help
When u-boot is used as a chain-loaded bootloader (replacing OS kernel),
enable this option to save fdt address, passed by the
previous bootloader for future use.
Address is saved to `prevbl_fdt_addr` environment variable.
If no fdt was provided by previous bootloader, no env variables
will be created.
config SAVE_PREV_BL_INITRAMFS_START_ADDR
depends on ARM
bool "Saves initramfs address, passed by the previous bootloader, to env var"
help
When u-boot is used as a chain-loaded bootloader(replacing OS kernel),
enable this option to save initramfs address, passed by the
previous bootloader for future use.
Address is saved to `prevbl_initrd_start_addr` environment variable.
If no initramfs was provided by previous bootloader, no env variables
will be created.
menu "Configuration editor"
config CEDIT
bool "Configuration editor"
depends on EXPO
help
Provides a way to deal with board configuration and present it to
the user for adjustment.
This is intended to provide both graphical and text-based user
interfaces, but only graphical is support at present.
endmenu # Configuration editor
endmenu # Booting