#
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# For a description of the syntax of this configuration file,
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# see the file Documentation/kbuild/kconfig-language.txt in the
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# Linux kernel source tree.
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#
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mainmenu "U-Boot $UBOOTVERSION Configuration"
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config UBOOTVERSION
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string
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option env="UBOOTVERSION"
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# Allow defaults in arch-specific code to override any given here
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source "arch/Kconfig"
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menu "General setup"
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config BROKEN
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bool
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help
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This option cannot be enabled. It is used as dependency
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for broken and incomplete features.
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config LOCALVERSION
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string "Local version - append to U-Boot release"
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help
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Append an extra string to the end of your U-Boot version.
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This will show up in your boot log, for example.
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The string you set here will be appended after the contents of
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any files with a filename matching localversion* in your
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object and source tree, in that order. Your total string can
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be a maximum of 64 characters.
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config LOCALVERSION_AUTO
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bool "Automatically append version information to the version string"
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default y
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help
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This will try to automatically determine if the current tree is a
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release tree by looking for Git tags that belong to the current
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top of tree revision.
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A string of the format -gxxxxxxxx will be added to the localversion
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if a Git-based tree is found. The string generated by this will be
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appended after any matching localversion* files, and after the value
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set in CONFIG_LOCALVERSION.
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(The actual string used here is the first eight characters produced
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by running the command:
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$ git rev-parse --verify HEAD
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which is done within the script "scripts/setlocalversion".)
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config CC_OPTIMIZE_FOR_SIZE
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bool "Optimize for size"
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default y
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help
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Enabling this option will pass "-Os" instead of "-O2" to gcc
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resulting in a smaller U-Boot image.
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This option is enabled by default for U-Boot.
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config DISTRO_DEFAULTS
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bool "Select defaults suitable for booting general purpose Linux distributions"
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default y if ARCH_SUNXI || TEGRA
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default y if ARCH_LS2080A
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default y if ARCH_MESON
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default y if ARCH_ROCKCHIP
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default n
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select CMD_BOOTZ if ARM && !ARM64
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select CMD_BOOTI if ARM64
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select CMD_DHCP
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imply CMD_PXE
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select CMD_EXT2
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select CMD_EXT4
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select CMD_FAT
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select CMD_FS_GENERIC
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imply CMD_MII
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select CMD_PING
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select CMD_PART
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select HUSH_PARSER
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help
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Select this to enable various options and commands which are suitable
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for building u-boot for booting general purpose Linux distributions.
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config SYS_MALLOC_F
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bool "Enable malloc() pool before relocation"
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default y if DM
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help
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Before relocation, memory is very limited on many platforms. Still,
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we can provide a small malloc() pool if needed. Driver model in
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particular needs this to operate, so that it can allocate the
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initial serial device and any others that are needed.
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config SYS_MALLOC_F_LEN
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hex "Size of malloc() pool before relocation"
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depends on SYS_MALLOC_F
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default 0x400
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help
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Before relocation, memory is very limited on many platforms. Still,
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we can provide a small malloc() pool if needed. Driver model in
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particular needs this to operate, so that it can allocate the
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initial serial device and any others that are needed.
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config SPL_SYS_MALLOC_F_LEN
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hex "Size of malloc() pool in SPL before relocation"
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depends on SYS_MALLOC_F
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default SYS_MALLOC_F_LEN
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help
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Before relocation, memory is very limited on many platforms. Still,
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we can provide a small malloc() pool if needed. Driver model in
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particular needs this to operate, so that it can allocate the
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initial serial device and any others that are needed.
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config TPL_SYS_MALLOC_F_LEN
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hex "Size of malloc() pool in TPL before relocation"
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depends on SYS_MALLOC_F
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default SYS_MALLOC_F_LEN
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help
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Before relocation, memory is very limited on many platforms. Still,
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we can provide a small malloc() pool if needed. Driver model in
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particular needs this to operate, so that it can allocate the
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initial serial device and any others that are needed.
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menuconfig EXPERT
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bool "Configure standard U-Boot features (expert users)"
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default y
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help
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This option allows certain base U-Boot options and settings
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to be disabled or tweaked. This is for specialized
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environments which can tolerate a "non-standard" U-Boot.
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Use this only if you really know what you are doing.
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if EXPERT
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config SYS_MALLOC_CLEAR_ON_INIT
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bool "Init with zeros the memory reserved for malloc (slow)"
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default y if !ARCH_ROCKCHIP
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help
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This setting is enabled by default. The reserved malloc
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memory is initialized with zeros, so first malloc calls
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will return the pointer to the zeroed memory. But this
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slows the boot time.
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It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
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value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
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Then the boot time can be significantly reduced.
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Warning:
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When disabling this, please check if malloc calls, maybe
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should be replaced by calloc - if one expects zeroed memory.
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config TOOLS_DEBUG
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bool "Enable debug information for tools"
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help
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Enable generation of debug information for tools such as mkimage.
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This can be used for debugging purposes. With debug information
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it is possible to set breakpoints on particular lines, single-step
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debug through the source code, etc.
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endif # EXPERT
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config PHYS_64BIT
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bool "64bit physical address support"
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help
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Say Y here to support 64bit physical memory address.
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This can be used not only for 64bit SoCs, but also for
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large physical address extention on 32bit SoCs.
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endmenu # General setup
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menu "Boot images"
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config ANDROID_BOOT_IMAGE
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bool "Enable support for Android Boot Images"
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default y if FASTBOOT
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help
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This enables support for booting images which use the Android
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image format header.
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config FIT
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bool "Support Flattened Image Tree"
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help
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This option allows you to boot the new uImage structure,
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Flattened Image Tree. FIT is formally a FDT, which can include
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images of various types (kernel, FDT blob, ramdisk, etc.)
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in a single blob. To boot this new uImage structure,
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pass the address of the blob to the "bootm" command.
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FIT is very flexible, supporting compression, multiple images,
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multiple configurations, verification through hashing and also
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verified boot (secure boot using RSA).
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if FIT
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config FIT_ENABLE_SHA256_SUPPORT
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bool "Support SHA256 checksum of FIT image contents"
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select SHA256 if !DM_CRYPTO
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default y
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help
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Enable this to support SHA256 checksum of FIT image contents. A
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SHA256 checksum is a 256-bit (32-byte) hash value used to check that
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the image contents have not been corrupted. SHA256 is recommended
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for use in secure applications since (as at 2016) there is no known
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feasible attack that could produce a 'collision' with differing
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input data. Use this for the highest security. Note that only the
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SHA256 variant is supported: SHA512 and others are not currently
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supported in U-Boot.
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config FIT_ENABLE_RSA4096_SUPPORT
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bool "Support RSA4096 verification of FIT image contents"
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select RSA_SOFTWARE_EXP if !DM_CRYPTO
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default n
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help
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Enable this to support RSA4096 checksum of FIT image contents. A
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RSA4096 is a 4096-bit (512-byte) key used to check that
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check if the content comes from an encryption party. RSA4096 is one
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of algorithms recommended for use in secure applications since (as at 2016)
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there is no known feasible attack that could produce a 'collision' with differing
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input data. Use this for the higher security than RSA2048 in default.
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config FIT_SIGNATURE
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bool "Enable signature verification of FIT uImages"
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depends on DM
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select RSA
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select CONSOLE_DISABLE_CLI
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help
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This option enables signature verification of FIT uImages,
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using a hash signed and verified using RSA. If
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CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
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hashing is available using hardware, then the RSA library will use
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it. See doc/uImage.FIT/signature.txt for more details.
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WARNING: When relying on signed FIT images with a required signature
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check the legacy image format is disabled by default, so that
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unsigned images cannot be loaded. If a board needs the legacy image
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format support in this case, enable it using
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CONFIG_IMAGE_FORMAT_LEGACY.
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config FIT_ROLLBACK_PROTECT
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bool "Enable rollback-index protection for FIT image"
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depends on FIT_SIGNATURE
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help
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Enable rollback-index protection for FIT image
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config FIT_ENABLE_RSASSA_PSS_SUPPORT
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bool "Support rsassa-pss signature scheme of FIT image contents"
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depends on FIT_SIGNATURE
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default y
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help
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Enable this to support the pss padding algorithm as described
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in the rfc8017 (https://tools.ietf.org/html/rfc8017).
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config FIT_VERBOSE
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bool "Show verbose messages when FIT images fail"
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help
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Generally a system will have valid FIT images so debug messages
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are a waste of code space. If you are debugging your images then
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you can enable this option to get more verbose information about
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failures.
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config FIT_BEST_MATCH
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bool "Select the best match for the kernel device tree"
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help
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When no configuration is explicitly selected, default to the
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one whose fdt's compatibility field best matches that of
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U-Boot itself. A match is considered "best" if it matches the
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most specific compatibility entry of U-Boot's fdt's root node.
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The order of entries in the configuration's fdt is ignored.
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config FIT_IMAGE_POST_PROCESS
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bool "Enable post-processing of FIT artifacts after loading by U-Boot"
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help
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Allows doing any sort of manipulation to blobs after they got extracted
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from FIT images like stripping off headers or modifying the size of the
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blob, verification, authentication, decryption etc. in a platform or
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board specific way. In order to use this feature a platform or board-
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specific implementation of board_fit_image_post_process() must be
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provided. Also, anything done during this post-processing step would
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need to be comprehended in how the images were prepared before being
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injected into the FIT creation (i.e. the blobs would have been pre-
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processed before being added to the FIT image).
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config FIT_HW_CRYPTO
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bool "Enable hardware crypto for FIT image checksum and rsa verify"
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depends on DM_CRYPTO
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help
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Enable hardware crypto for FIT image checksum and rsa verify.
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config FIT_PRINT
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bool "Enable fit image structure and data print"
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default y
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help
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Say y here if you want to enable fit image structure and data
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print.
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config FIT_OMIT_UBOOT
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bool "Omit u-boot-nodtb.bin and u-boot.dtb when output uboot.itb"
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if SPL
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config SPL_FIT
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bool "Support Flattened Image Tree within SPL"
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depends on SPL
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select SPL_OF_LIBFDT
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config SPL_FIT_SIGNATURE
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bool "Enable signature verification of FIT firmware within SPL"
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depends on SPL_DM
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select SPL_FIT
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select SPL_RSA
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config SPL_FIT_ROLLBACK_PROTECT
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bool "Enable SPL rollback-index protection for FIT image"
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depends on SPL_FIT_SIGNATURE
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help
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Enable SPL rollback-index protection for FIT image
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config SPL_LOAD_FIT
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bool "Enable SPL loading U-Boot as a FIT"
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select SPL_FIT
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help
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Normally with the SPL framework a legacy image is generated as part
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of the build. This contains U-Boot along with information as to
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where it should be loaded. This option instead enables generation
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of a FIT (Flat Image Tree) which provides more flexibility. In
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particular it can handle selecting from multiple device tree
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and passing the correct one to U-Boot.
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config SPL_FIT_IMAGE_POST_PROCESS
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bool "Enable post-processing of FIT artifacts after loading by the SPL"
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depends on SPL_LOAD_FIT
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help
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Allows doing any sort of manipulation to blobs after they got extracted
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from the U-Boot FIT image like stripping off headers or modifying the
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size of the blob, verification, authentication, decryption etc. in a
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platform or board specific way. In order to use this feature a platform
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or board-specific implementation of board_fit_image_post_process() must
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be provided. Also, anything done during this post-processing step would
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need to be comprehended in how the images were prepared before being
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injected into the FIT creation (i.e. the blobs would have been pre-
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processed before being added to the FIT image).
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config SPL_FIT_HW_CRYPTO
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bool "Enable SPL hardware crypto for FIT image checksum and rsa verify"
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depends on SPL_DM_CRYPTO
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help
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Enable SPL hardware crypto for FIT image checksum and rsa verify.
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config SPL_SYS_DCACHE_OFF
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bool "Disable SPL dcache"
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default y
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help
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Disable SPL dcache. Please make sure CONFIG_SPL_SYS_MALLOC_F_LEN
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is large enough to malloc TLB and bd_t buffer while enabling dcache.
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config SPL_FIT_PRINT
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bool "Enable fit image structure and data print in SPL"
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default n
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help
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Say y here if you want to enable fit image structure and data
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print in SPL.
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endif # SPL
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config SPL_FIT_SOURCE
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string ".its source file for U-Boot FIT image"
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depends on SPL_FIT || FIT
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help
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Specifies a (platform specific) FIT source file to generate the
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U-Boot FIT image. This could specify further image to load and/or
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execute.
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config SPL_FIT_GENERATOR
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string ".its file generator script for U-Boot FIT image"
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depends on SPL_FIT || FIT
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default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
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help
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Specifies a (platform specific) script file to generate the FIT
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source file used to build the U-Boot FIT image file. This gets
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passed a list of supported device tree file stub names to
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include in the generated image.
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config SPL_FIT_IMAGE_KB
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int "SPL FIT image size in KiB"
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depends on SPL_FIT || FIT
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default 2048
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help
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SPL FIT image size in KiB, default 2048KB = 1024KB(u-boot) + 1024KB(tee/atf + others).
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config SPL_FIT_IMAGE_MULTIPLE
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int "SPL FIT image multiple number"
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depends on SPL_FIT || FIT
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default 2
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help
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SPL FIT image multiple number.
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endif # FIT
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config OF_BOARD_SETUP
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bool "Set up board-specific details in device tree before boot"
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depends on OF_LIBFDT
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help
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This causes U-Boot to call ft_board_setup() before booting into
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the Operating System. This function can set up various
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board-specific information in the device tree for use by the OS.
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The device tree is then passed to the OS.
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config OF_SYSTEM_SETUP
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bool "Set up system-specific details in device tree before boot"
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depends on OF_LIBFDT
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help
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This causes U-Boot to call ft_system_setup() before booting into
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the Operating System. This function can set up various
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system-specific information in the device tree for use by the OS.
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The device tree is then passed to the OS.
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config OF_STDOUT_VIA_ALIAS
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bool "Update the device-tree stdout alias from U-Boot"
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depends on OF_LIBFDT
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help
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This uses U-Boot's serial alias from the aliases node to update
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the device tree passed to the OS. The "linux,stdout-path" property
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in the chosen node is set to point to the correct serial node.
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This option currently references CONFIG_CONS_INDEX, which is
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incorrect when used with device tree as this option does not
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exist / should not be used.
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config SYS_EXTRA_OPTIONS
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string "Extra Options (DEPRECATED)"
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help
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The old configuration infrastructure (= mkconfig + boards.cfg)
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provided the extra options field. If you have something like
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"HAS_BAR,BAZ=64", the optional options
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#define CONFIG_HAS
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#define CONFIG_BAZ 64
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will be defined in include/config.h.
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This option was prepared for the smooth migration from the old
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configuration to Kconfig. Since this option will be removed sometime,
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new boards should not use this option.
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config SYS_TEXT_BASE
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depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
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(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
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ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS
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depends on !EFI_APP
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hex "Text Base"
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help
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TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
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default 0x80800000 if ARCH_OMAP2PLUS
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config SYS_CLK_FREQ
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depends on ARC || ARCH_SUNXI
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int "CPU clock frequency"
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help
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TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
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config ARCH_FIXUP_FDT_MEMORY
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bool "Enable arch_fixup_memory_banks() call"
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default y
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help
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Enable FDT memory map syncup before OS boot. This feature can be
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used for booting OS with different memory setup where the part of
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the memory location should be used for different purpose.
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endmenu # Boot images
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source "api/Kconfig"
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source "common/Kconfig"
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source "cmd/Kconfig"
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source "disk/Kconfig"
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source "dts/Kconfig"
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source "env/Kconfig"
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "lib/Kconfig"
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source "test/Kconfig"
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