#
# For a description of the syntax of this configuration file,
# see the file Documentation/kbuild/kconfig-language.txt in the
# Linux kernel source tree.
#
mainmenu "U-Boot $UBOOTVERSION Configuration"
config UBOOTVERSION
string
option env="UBOOTVERSION"
# Allow defaults in arch-specific code to override any given here
source "arch/Kconfig"
menu "General setup"
config BROKEN
bool
help
This option cannot be enabled. It is used as dependency
for broken and incomplete features.
config LOCALVERSION
string "Local version - append to U-Boot release"
help
Append an extra string to the end of your U-Boot version.
This will show up in your boot log, for example.
The string you set here will be appended after the contents of
any files with a filename matching localversion* in your
object and source tree, in that order. Your total string can
be a maximum of 64 characters.
config LOCALVERSION_AUTO
bool "Automatically append version information to the version string"
default y
help
This will try to automatically determine if the current tree is a
release tree by looking for Git tags that belong to the current
top of tree revision.
A string of the format -gxxxxxxxx will be added to the localversion
if a Git-based tree is found. The string generated by this will be
appended after any matching localversion* files, and after the value
set in CONFIG_LOCALVERSION.
(The actual string used here is the first eight characters produced
by running the command:
$ git rev-parse --verify HEAD
which is done within the script "scripts/setlocalversion".)
config CC_OPTIMIZE_FOR_SIZE
bool "Optimize for size"
default y
help
Enabling this option will pass "-Os" instead of "-O2" to gcc
resulting in a smaller U-Boot image.
This option is enabled by default for U-Boot.
config CC_COVERAGE
bool "Enable code coverage analysis"
depends on SANDBOX
help
Enabling this option will pass "--coverage" to gcc to compile
and link code instrumented for coverage analysis.
config DISTRO_DEFAULTS
bool "Select defaults suitable for booting general purpose Linux distributions"
imply USE_BOOTCOMMAND
select CMD_BOOTZ if ARM && !ARM64
select CMD_BOOTI if ARM64
select CMD_DHCP if CMD_NET
select CMD_PING if CMD_NET
select CMD_PXE if NET
select CMD_ENV_EXISTS
select CMD_EXT2
select CMD_EXT4
select CMD_FAT
select CMD_FS_GENERIC
imply CMD_MII if NET
select CMD_PART if PARTITIONS
select HUSH_PARSER
select CMDLINE_EDITING
select AUTO_COMPLETE
select SYS_LONGHELP
select SUPPORT_RAW_INITRD
select ENV_VARS_UBOOT_CONFIG
help
Select this to enable various options and commands which are suitable
for building u-boot for booting general purpose Linux distributions.
config ENV_VARS_UBOOT_CONFIG
bool "Add arch, board, vendor and soc variables to default environment"
help
Define this in order to add variables describing the
U-Boot build configuration to the default environment.
These will be named arch, cpu, board, vendor, and soc.
Enabling this option will cause the following to be defined:
- CONFIG_SYS_ARCH
- CONFIG_SYS_CPU
- CONFIG_SYS_BOARD
- CONFIG_SYS_VENDOR
- CONFIG_SYS_SOC
config SYS_BOOT_GET_CMDLINE
bool "Enable kernel command line setup"
help
Enables allocating and saving kernel cmdline in space between
"bootm_low" and "bootm_low" + BOOTMAPSZ.
config SYS_BOOT_GET_KBD
bool "Enable kernel board information setup"
help
Enables allocating and saving a kernel copy of the bd_info in
space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
config SYS_MALLOC_F
bool "Enable malloc() pool before relocation"
default y if DM
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
config SYS_MALLOC_F_LEN
hex "Size of malloc() pool before relocation"
depends on SYS_MALLOC_F
default 0x1000 if AM33XX
default 0x400
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
config SPL_SYS_MALLOC_F_LEN
hex "Size of malloc() pool in SPL before relocation"
depends on SYS_MALLOC_F
default SYS_MALLOC_F_LEN
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
config TPL_SYS_MALLOC_F_LEN
hex "Size of malloc() pool in TPL before relocation"
depends on SYS_MALLOC_F
default SYS_MALLOC_F_LEN
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
menuconfig EXPERT
bool "Configure standard U-Boot features (expert users)"
default y
help
This option allows certain base U-Boot options and settings
to be disabled or tweaked. This is for specialized
environments which can tolerate a "non-standard" U-Boot.
Use this only if you really know what you are doing.
if EXPERT
config SYS_MALLOC_CLEAR_ON_INIT
bool "Init with zeros the memory reserved for malloc (slow)"
default y
help
This setting is enabled by default. The reserved malloc
memory is initialized with zeros, so first malloc calls
will return the pointer to the zeroed memory. But this
slows the boot time.
It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
Then the boot time can be significantly reduced.
Warning:
When disabling this, please check if malloc calls, maybe
should be replaced by calloc - if one expects zeroed memory.
config TOOLS_DEBUG
bool "Enable debug information for tools"
help
Enable generation of debug information for tools such as mkimage.
This can be used for debugging purposes. With debug information
it is possible to set breakpoints on particular lines, single-step
debug through the source code, etc.
endif # EXPERT
config PHYS_64BIT
bool "64bit physical address support"
help
Say Y here to support 64bit physical memory address.
This can be used not only for 64bit SoCs, but also for
large physical address extention on 32bit SoCs.
config BUILD_ROM
bool "Build U-Boot as BIOS replacement"
depends on X86
help
This option allows to build a ROM version of U-Boot.
The build process generally requires several binary blobs
which are not shipped in the U-Boot source tree.
Please, see doc/README.x86 for details.
endmenu # General setup
menu "Boot images"
config ANDROID_BOOT_IMAGE
bool "Enable support for Android Boot Images"
default y if FASTBOOT
help
This enables support for booting images which use the Android
image format header.
config FIT
bool "Support Flattened Image Tree"
select MD5
select SHA1
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_ENABLE_SHA256_SUPPORT
bool "Support SHA256 checksum of FIT image contents"
select SHA256
default y
help
Enable this to support SHA256 checksum of FIT image contents. A
SHA256 checksum is a 256-bit (32-byte) hash value used to check that
the image contents have not been corrupted. SHA256 is recommended
for use in secure applications since (as at 2016) there is no known
feasible attack that could produce a 'collision' with differing
input data. Use this for the highest security. Note that only the
SHA256 variant is supported: SHA512 and others are not currently
supported in U-Boot.
config FIT_SIGNATURE
bool "Enable signature verification of FIT uImages"
depends on DM
select RSA
select HASH
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_IMAGE_FORMAT_LEGACY.
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 TI_SECURE_DEVICE
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).
if SPL
config SPL_FIT
bool "Support Flattened Image Tree within SPL"
depends on SPL
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_SIGNATURE
bool "Enable signature verification of FIT firmware within SPL"
depends on SPL_DM
select SPL_FIT
select SPL_RSA
config SPL_LOAD_FIT
bool "Enable SPL loading U-Boot as a FIT"
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_LOAD_FIT_FULL
bool "Enable SPL loading U-Boot as a FIT"
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
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 SPL_FIT_GENERATOR
string ".its file generator script for U-Boot FIT image"
depends on SPL_FIT
default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
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.
endif # SPL
endif # FIT
config IMAGE_FORMAT_LEGACY
bool "Enable support for the legacy image format"
default y if !FIT_SIGNATURE
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 OF_BOARD_SETUP
bool "Set up board-specific details in device tree before boot"
depends on OF_LIBFDT
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"
depends on OF_LIBFDT
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"
depends on OF_LIBFDT
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 SYS_EXTRA_OPTIONS
string "Extra Options (DEPRECATED)"
help
The old configuration infrastructure (= mkconfig + boards.cfg)
provided the extra options field. If you have something like
"HAS_BAR,BAZ=64", the optional options
#define CONFIG_HAS
#define CONFIG_BAZ 64
will be defined in include/config.h.
This option was prepared for the smooth migration from the old
configuration to Kconfig. Since this option will be removed sometime,
new boards should not use this option.
config SYS_TEXT_BASE
depends on !NIOS2 && !XTENSA
depends on !EFI_APP
default 0x80800000 if ARCH_OMAP2PLUS
default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
hex "Text Base"
help
The address in memory that U-Boot will be running from, initially.
config SYS_CLK_FREQ
depends on ARC || ARCH_SUNXI
int "CPU clock frequency"
help
TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
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 # Boot images
source "api/Kconfig"
source "common/Kconfig"
source "cmd/Kconfig"
source "disk/Kconfig"
source "dts/Kconfig"
source "env/Kconfig"
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "lib/Kconfig"
source "test/Kconfig"