u-boot/Kconfig

#
# 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 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 DISTRO_DEFAULTS
	bool "Select defaults suitable for booting general purpose Linux distributions"
	default y if ARCH_SUNXI || TEGRA
	default y if ARCH_LS2080A
	default y if ARCH_MESON
	default y if ARCH_ROCKCHIP
	default n
	select CMD_BOOTZ if ARM && !ARM64
	select CMD_BOOTI if ARM64
	select CMD_DHCP
	select CMD_PXE
	select CMD_EXT2
	select CMD_EXT4
	select CMD_FAT
	select CMD_FS_GENERIC
	select CMD_MII
	select CMD_PING
	select CMD_PART
	select HUSH_PARSER
	help
	  Select this to enable various options and commands which are suitable
	  for building u-boot for booting general purpose Linux distributions.

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 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.

endmenu		# General setup

menu "Boot images"

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
	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_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_FIT_IMAGE_POST_PROCESS
	bool "Enable post-processing of FIT artifacts after loading by the SPL"
	depends on SPL_LOAD_FIT && 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 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 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 ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
		(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
		ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS
	depends on !EFI_APP
	hex "Text Base"
	help
	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture

	default 0x80800000 if ARCH_OMAP2PLUS


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"

source "scripts/Kconfig"