Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see the file Documentation/kbuild/kconfig-language.txt in the
   4 # Linux kernel source tree.
   5 #
   6 mainmenu "U-Boot $UBOOTVERSION Configuration"
   7
   8 config UBOOTVERSION
   9         string
  10         option env="UBOOTVERSION"
  11
  12 # Allow defaults in arch-specific code to override any given here
  13 source "arch/Kconfig"
  14
  15 menu "General setup"
  16
  17 config LOCALVERSION
  18         string "Local version - append to U-Boot release"
  19         help
  20           Append an extra string to the end of your U-Boot version.
  21           This will show up in your boot log, for example.
  22           The string you set here will be appended after the contents of
  23           any files with a filename matching localversion* in your
  24           object and source tree, in that order.  Your total string can
  25           be a maximum of 64 characters.
  26
  27 config LOCALVERSION_AUTO
  28         bool "Automatically append version information to the version string"
  29         default y
  30         help
  31           This will try to automatically determine if the current tree is a
  32           release tree by looking for Git tags that belong to the current
  33           top of tree revision.
  34
  35           A string of the format -gxxxxxxxx will be added to the localversion
  36           if a Git-based tree is found.  The string generated by this will be
  37           appended after any matching localversion* files, and after the value
  38           set in CONFIG_LOCALVERSION.
  39
  40           (The actual string used here is the first eight characters produced
  41           by running the command:
  42
  43             $ git rev-parse --verify HEAD
  44
  45           which is done within the script "scripts/setlocalversion".)
  46
  47 config CC_OPTIMIZE_FOR_SIZE
  48         bool "Optimize for size"
  49         default y
  50         help
  51           Enabling this option will pass "-Os" instead of "-O2" to gcc
  52           resulting in a smaller U-Boot image.
  53
  54           This option is enabled by default for U-Boot.
  55
  56 config DISTRO_DEFAULTS
  57         bool "Select defaults suitable for booting general purpose Linux distributions"
  58         default y if ARCH_SUNXI || TEGRA
  59         default y if ARCH_LS2080A
  60         default y if ARCH_MESON
  61         default y if ARCH_ROCKCHIP
  62         default n
  63         select CMD_BOOTZ if ARM && !ARM64
  64         select CMD_BOOTI if ARM64
  65         select CMD_DHCP
  66         select CMD_PXE
  67         select CMD_EXT2
  68         select CMD_EXT4
  69         select CMD_FAT
  70         select CMD_FS_GENERIC
  71         select CMD_MII
  72         select CMD_PING
  73         select CMD_PART
  74         select HUSH_PARSER
  75         help
  76           Select this to enable various options and commands which are suitable
  77           for building u-boot for booting general purpose Linux distributions.
  78
  79 config SYS_MALLOC_F
  80         bool "Enable malloc() pool before relocation"
  81         default y if DM
  82         help
  83           Before relocation, memory is very limited on many platforms. Still,
  84           we can provide a small malloc() pool if needed. Driver model in
  85           particular needs this to operate, so that it can allocate the
  86           initial serial device and any others that are needed.
  87
  88 config SYS_MALLOC_F_LEN
  89         hex "Size of malloc() pool before relocation"
  90         depends on SYS_MALLOC_F
  91         default 0x400
  92         help
  93           Before relocation, memory is very limited on many platforms. Still,
  94           we can provide a small malloc() pool if needed. Driver model in
  95           particular needs this to operate, so that it can allocate the
  96           initial serial device and any others that are needed.
  97
  98 menuconfig EXPERT
  99         bool "Configure standard U-Boot features (expert users)"
 100         default y
 101         help
 102           This option allows certain base U-Boot options and settings
 103           to be disabled or tweaked. This is for specialized
 104           environments which can tolerate a "non-standard" U-Boot.
 105           Use this only if you really know what you are doing.
 106
 107 if EXPERT
 108         config SYS_MALLOC_CLEAR_ON_INIT
 109         bool "Init with zeros the memory reserved for malloc (slow)"
 110         default y
 111         help
 112           This setting is enabled by default. The reserved malloc
 113           memory is initialized with zeros, so first malloc calls
 114           will return the pointer to the zeroed memory. But this
 115           slows the boot time.
 116
 117           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 118           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 119           Then the boot time can be significantly reduced.
 120           Warning:
 121           When disabling this, please check if malloc calls, maybe
 122           should be replaced by calloc - if one expects zeroed memory.
 123
 124 config TOOLS_DEBUG
 125         bool "Enable debug information for tools"
 126         help
 127           Enable generation of debug information for tools such as mkimage.
 128           This can be used for debugging purposes. With debug information
 129           it is possible to set breakpoints on particular lines, single-step
 130           debug through the source code, etc.
 131
 132 endif # EXPERT
 133
 134 config PHYS_64BIT
 135         bool "64bit physical address support"
 136         help
 137           Say Y here to support 64bit physical memory address.
 138           This can be used not only for 64bit SoCs, but also for
 139           large physical address extention on 32bit SoCs.
 140
 141 endmenu         # General setup
 142
 143 menu "Boot images"
 144
 145 config FIT
 146         bool "Support Flattened Image Tree"
 147         select MD5
 148         help
 149           This option allows you to boot the new uImage structure,
 150           Flattened Image Tree.  FIT is formally a FDT, which can include
 151           images of various types (kernel, FDT blob, ramdisk, etc.)
 152           in a single blob.  To boot this new uImage structure,
 153           pass the address of the blob to the "bootm" command.
 154           FIT is very flexible, supporting compression, multiple images,
 155           multiple configurations, verification through hashing and also
 156           verified boot (secure boot using RSA).
 157
 158 if FIT
 159
 160 config FIT_ENABLE_SHA256_SUPPORT
 161         bool "Support SHA256 checksum of FIT image contents"
 162         default y
 163         help
 164           Enable this to support SHA256 checksum of FIT image contents. A
 165           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 166           the image contents have not been corrupted. SHA256 is recommended
 167           for use in secure applications since (as at 2016) there is no known
 168           feasible attack that could produce a 'collision' with differing
 169           input data. Use this for the highest security. Note that only the
 170           SHA256 variant is supported: SHA512 and others are not currently
 171           supported in U-Boot.
 172
 173 config FIT_SIGNATURE
 174         bool "Enable signature verification of FIT uImages"
 175         depends on DM
 176         select RSA
 177         help
 178           This option enables signature verification of FIT uImages,
 179           using a hash signed and verified using RSA. If
 180           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 181           hashing is available using hardware, then the RSA library will use
 182           it. See doc/uImage.FIT/signature.txt for more details.
 183
 184           WARNING: When relying on signed FIT images with a required signature
 185           check the legacy image format is disabled by default, so that
 186           unsigned images cannot be loaded. If a board needs the legacy image
 187           format support in this case, enable it using
 188           CONFIG_IMAGE_FORMAT_LEGACY.
 189
 190 config FIT_VERBOSE
 191         bool "Show verbose messages when FIT images fail"
 192         help
 193           Generally a system will have valid FIT images so debug messages
 194           are a waste of code space. If you are debugging your images then
 195           you can enable this option to get more verbose information about
 196           failures.
 197
 198 config FIT_BEST_MATCH
 199         bool "Select the best match for the kernel device tree"
 200         help
 201           When no configuration is explicitly selected, default to the
 202           one whose fdt's compatibility field best matches that of
 203           U-Boot itself. A match is considered "best" if it matches the
 204           most specific compatibility entry of U-Boot's fdt's root node.
 205           The order of entries in the configuration's fdt is ignored.
 206
 207 config FIT_IMAGE_POST_PROCESS
 208         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 209         depends on TI_SECURE_DEVICE
 210         help
 211           Allows doing any sort of manipulation to blobs after they got extracted
 212           from FIT images like stripping off headers or modifying the size of the
 213           blob, verification, authentication, decryption etc. in a platform or
 214           board specific way. In order to use this feature a platform or board-
 215           specific implementation of board_fit_image_post_process() must be
 216           provided. Also, anything done during this post-processing step would
 217           need to be comprehended in how the images were prepared before being
 218           injected into the FIT creation (i.e. the blobs would have been pre-
 219           processed before being added to the FIT image).
 220
 221 config SPL_FIT
 222         bool "Support Flattened Image Tree within SPL"
 223         depends on SPL
 224
 225 config SPL_FIT_SIGNATURE
 226         bool "Enable signature verification of FIT firmware within SPL"
 227         depends on SPL_FIT
 228         depends on SPL_DM
 229         select SPL_RSA
 230
 231 config SPL_LOAD_FIT
 232         bool "Enable SPL loading U-Boot as a FIT"
 233         help
 234           Normally with the SPL framework a legacy image is generated as part
 235           of the build. This contains U-Boot along with information as to
 236           where it should be loaded. This option instead enables generation
 237           of a FIT (Flat Image Tree) which provides more flexibility. In
 238           particular it can handle selecting from multiple device tree
 239           and passing the correct one to U-Boot.
 240
 241 config SPL_FIT_IMAGE_POST_PROCESS
 242         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 243         depends on SPL_LOAD_FIT && TI_SECURE_DEVICE
 244         help
 245           Allows doing any sort of manipulation to blobs after they got extracted
 246           from the U-Boot FIT image like stripping off headers or modifying the
 247           size of the blob, verification, authentication, decryption etc. in a
 248           platform or board specific way. In order to use this feature a platform
 249           or board-specific implementation of board_fit_image_post_process() must
 250           be provided. Also, anything done during this post-processing step would
 251           need to be comprehended in how the images were prepared before being
 252           injected into the FIT creation (i.e. the blobs would have been pre-
 253           processed before being added to the FIT image).
 254
 255 endif # FIT
 256
 257 config OF_BOARD_SETUP
 258         bool "Set up board-specific details in device tree before boot"
 259         depends on OF_LIBFDT
 260         help
 261           This causes U-Boot to call ft_board_setup() before booting into
 262           the Operating System. This function can set up various
 263           board-specific information in the device tree for use by the OS.
 264           The device tree is then passed to the OS.
 265
 266 config OF_SYSTEM_SETUP
 267         bool "Set up system-specific details in device tree before boot"
 268         depends on OF_LIBFDT
 269         help
 270           This causes U-Boot to call ft_system_setup() before booting into
 271           the Operating System. This function can set up various
 272           system-specific information in the device tree for use by the OS.
 273           The device tree is then passed to the OS.
 274
 275 config OF_STDOUT_VIA_ALIAS
 276         bool "Update the device-tree stdout alias from U-Boot"
 277         depends on OF_LIBFDT
 278         help
 279           This uses U-Boot's serial alias from the aliases node to update
 280           the device tree passed to the OS. The "linux,stdout-path" property
 281           in the chosen node is set to point to the correct serial node.
 282           This option currently references CONFIG_CONS_INDEX, which is
 283           incorrect when used with device tree as this option does not
 284           exist / should not be used.
 285
 286 config SYS_EXTRA_OPTIONS
 287         string "Extra Options (DEPRECATED)"
 288         help
 289           The old configuration infrastructure (= mkconfig + boards.cfg)
 290           provided the extra options field. If you have something like
 291           "HAS_BAR,BAZ=64", the optional options
 292             #define CONFIG_HAS
 293             #define CONFIG_BAZ  64
 294           will be defined in include/config.h.
 295           This option was prepared for the smooth migration from the old
 296           configuration to Kconfig. Since this option will be removed sometime,
 297           new boards should not use this option.
 298
 299 config SYS_TEXT_BASE
 300         depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 301                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
 302                 ARCH_ZYNQ || ARCH_KEYSTONE
 303         depends on !EFI_APP
 304         hex "Text Base"
 305         help
 306           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 307
 308
 309 config SYS_CLK_FREQ
 310         depends on ARC || ARCH_SUNXI
 311         int "CPU clock frequency"
 312         help
 313           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 314
 315 config ARCH_FIXUP_FDT_MEMORY
 316         bool "Enable arch_fixup_memory_banks() call"
 317         default y
 318         help
 319           Enable FDT memory map syncup before OS boot. This feature can be
 320           used for booting OS with different memory setup where the part of
 321           the memory location should be used for different purpose.
 322
 323 endmenu         # Boot images
 324
 325 source "api/Kconfig"
 326
 327 source "common/Kconfig"
 328
 329 source "cmd/Kconfig"
 330
 331 source "disk/Kconfig"
 332
 333 source "dts/Kconfig"
 334
 335 source "net/Kconfig"
 336
 337 source "drivers/Kconfig"
 338
 339 source "fs/Kconfig"
 340
 341 source "lib/Kconfig"
 342
 343 source "test/Kconfig"
 344
 345 source "scripts/Kconfig"