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"

# 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 DEPRECATED
	bool
	help
	  This option cannot be enabled.  It it used as a dependency for
	  code that relies on deprecated features that will be removed and
	  the conversion deadline has passed.

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"
	select AUTO_COMPLETE
	select CMDLINE_EDITING
	select CMD_BOOTI if ARM64
	select CMD_BOOTZ if ARM && !ARM64
	select CMD_DHCP if CMD_NET
	select CMD_ENV_EXISTS
	select CMD_EXT2
	select CMD_EXT4
	select CMD_FAT
	select CMD_FS_GENERIC
	select CMD_PART if PARTITIONS
	select CMD_PING if CMD_NET
	select CMD_PXE if NET
	select CMD_SYSBOOT
	select ENV_VARS_UBOOT_CONFIG
	select HUSH_PARSER
	select SUPPORT_RAW_INITRD
	select SYS_LONGHELP
	imply CMD_MII if NET
	imply USB_STORAGE
	imply USE_BOOTCOMMAND
	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 NR_DRAM_BANKS
	int "Number of DRAM banks"
	default 1 if ARCH_SUNXI
	default 4
	help
	  This defines the number of DRAM banks.

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 0x2800 if SANDBOX
	default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
			   ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
			   ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
			   ARCH_LS1046A)
	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 SYS_MALLOC_LEN
	hex "Define memory for Dynamic allocation"
	depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
	default 0x2000000 if ARCH_ROCKCHIP
	help
	  This defines memory to be allocated for Dynamic allocation
	  TODO: Use for other architectures

config SPL_SYS_MALLOC_F_LEN
	hex "Size of malloc() pool in SPL before relocation"
	depends on SYS_MALLOC_F && SPL
	default 0x2800 if RCAR_GEN3
	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 && TPL
	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 extension 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/arch/x86.rst for details.

config SPL_IMAGE
	string "SPL image used in the combined SPL+U-Boot image"
	default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
	default "spl/u-boot-spl.bin"
	depends on SPL
	help
	  Select the SPL build target that shall be generated by the SPL
	  build process (default spl/u-boot-spl.bin). This image will be
	  used to generate a combined image with SPL and main U-Boot
	  proper as one single image.

config BUILD_TARGET
	string "Build target special images"
	default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
	default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
	default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
	default "u-boot-elf.srec" if RCAR_GEN3
	default "u-boot.itb" if SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
				ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
	default "u-boot.kwb" if KIRKWOOD
	default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
	default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
	help
	  Some SoCs need special image types (e.g. U-Boot binary
	  with a special header) as build targets. By defining
	  CONFIG_BUILD_TARGET in the SoC / board header, this
	  special image will be automatically built upon calling
	  make / buildman.

config SYS_CUSTOM_LDSCRIPT
	bool "Use a custom location for the U-Boot linker script"
	help
	  Normally when linking U-Boot we will look in the board directory,
	  the CPU directory and finally the "cpu" directory of the architecture
	  for the ile "u-boot.lds" and use that as our linker.  However, in
	  some cases we need to provide a different linker script.  To do so,
	  enable this option and then provide the location under
	  CONFIG_SYS_LDSCRIPT.

config SYS_LDSCRIPT
	depends on SYS_CUSTOM_LDSCRIPT
	string "Custom ldscript location"
	help
	  Path within the source tree to the linker script to use for the
	  main U-Boot binary.

config ERR_PTR_OFFSET
	hex
	default 0x0
	help
	  Some U-Boot pointers have redundant information, so we can use a
	  scheme where we can return either an error code or a pointer with the
	  same return value. The default implementation just casts the pointer
	  to a number, however, this may fail on platforms where the end of the
	  address range is used for valid pointers (e.g. 0xffffff00 is a valid
	  heap pointer in socfpga SPL).
	  For such platforms, this value provides an upper range of those error
	  pointer values - up to 'MAX_ERRNO' bytes below this value must be
	  unused/invalid addresses.

config PLATFORM_ELFENTRY
	string
	default "__start" if MIPS
	default "_start"

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_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_ENABLE_SHA256_SUPPORT
	bool "Support SHA256 checksum of FIT image contents"
	default y
	select SHA256
	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 HASH
	select RSA
	select RSA_VERIFY
	select IMAGE_SIGN_INFO
	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_ENABLE_RSASSA_PSS_SUPPORT
	bool "Support rsassa-pss signature scheme of FIT image contents"
	depends on FIT_SIGNATURE
	default n
	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 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
	select SPL_RSA_VERIFY
	select IMAGE_SIGN_INFO

config SPL_LOAD_FIT
	bool "Enable SPL loading U-Boot as a FIT (basic 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_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 is 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
	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
	default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
	default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
	default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
	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 LEGACY_IMAGE_FORMAT
	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 HAVE_SYS_TEXT_BASE
	bool
	depends on !NIOS2 && !XTENSA
	depends on !EFI_APP
	default y

config SYS_TEXT_BASE
	depends on HAVE_SYS_TEXT_BASE
	default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
	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 || MPC83xx
	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"