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 BROKEN
  18         bool
  19         help
  20           This option cannot be enabled. It is used as dependency
  21           for broken and incomplete features.
  22
  23 config LOCALVERSION
  24         string "Local version - append to U-Boot release"
  25         help
  26           Append an extra string to the end of your U-Boot version.
  27           This will show up in your boot log, for example.
  28           The string you set here will be appended after the contents of
  29           any files with a filename matching localversion* in your
  30           object and source tree, in that order.  Your total string can
  31           be a maximum of 64 characters.
  32
  33 config LOCALVERSION_AUTO
  34         bool "Automatically append version information to the version string"
  35         default y
  36         help
  37           This will try to automatically determine if the current tree is a
  38           release tree by looking for Git tags that belong to the current
  39           top of tree revision.
  40
  41           A string of the format -gxxxxxxxx will be added to the localversion
  42           if a Git-based tree is found.  The string generated by this will be
  43           appended after any matching localversion* files, and after the value
  44           set in CONFIG_LOCALVERSION.
  45
  46           (The actual string used here is the first eight characters produced
  47           by running the command:
  48
  49             $ git rev-parse --verify HEAD
  50
  51           which is done within the script "scripts/setlocalversion".)
  52
  53 config CC_OPTIMIZE_FOR_SIZE
  54         bool "Optimize for size"
  55         default y
  56         help
  57           Enabling this option will pass "-Os" instead of "-O2" to gcc
  58           resulting in a smaller U-Boot image.
  59
  60           This option is enabled by default for U-Boot.
  61
  62 config DISTRO_DEFAULTS
  63         bool "Select defaults suitable for booting general purpose Linux distributions"
  64         default y if ARCH_SUNXI || TEGRA
  65         default y if ARCH_LS2080A
  66         default y if ARCH_MESON
  67         default y if ARCH_ROCKCHIP
  68         default n
  69         imply USE_BOOTCOMMAND
  70         select CMD_BOOTZ if ARM && !ARM64
  71         select CMD_BOOTI if ARM64
  72         select CMD_DHCP
  73         select CMD_PXE
  74         select CMD_EXT2
  75         select CMD_EXT4
  76         select CMD_FAT
  77         select CMD_FS_GENERIC
  78         select CMD_MII
  79         select CMD_PING
  80         select CMD_PART
  81         select HUSH_PARSER
  82         help
  83           Select this to enable various options and commands which are suitable
  84           for building u-boot for booting general purpose Linux distributions.
  85
  86 config SYS_MALLOC_F
  87         bool "Enable malloc() pool before relocation"
  88         default y if DM
  89         help
  90           Before relocation, memory is very limited on many platforms. Still,
  91           we can provide a small malloc() pool if needed. Driver model in
  92           particular needs this to operate, so that it can allocate the
  93           initial serial device and any others that are needed.
  94
  95 config SYS_MALLOC_F_LEN
  96         hex "Size of malloc() pool before relocation"
  97         depends on SYS_MALLOC_F
  98         default 0x400
  99         help
 100           Before relocation, memory is very limited on many platforms. Still,
 101           we can provide a small malloc() pool if needed. Driver model in
 102           particular needs this to operate, so that it can allocate the
 103           initial serial device and any others that are needed.
 104
 105 config SPL_SYS_MALLOC_F_LEN
 106         hex "Size of malloc() pool in SPL before relocation"
 107         depends on SYS_MALLOC_F
 108         default SYS_MALLOC_F_LEN
 109         help
 110           Before relocation, memory is very limited on many platforms. Still,
 111           we can provide a small malloc() pool if needed. Driver model in
 112           particular needs this to operate, so that it can allocate the
 113           initial serial device and any others that are needed.
 114
 115 config TPL_SYS_MALLOC_F_LEN
 116         hex "Size of malloc() pool in TPL before relocation"
 117         depends on SYS_MALLOC_F
 118         default SYS_MALLOC_F_LEN
 119         help
 120           Before relocation, memory is very limited on many platforms. Still,
 121           we can provide a small malloc() pool if needed. Driver model in
 122           particular needs this to operate, so that it can allocate the
 123           initial serial device and any others that are needed.
 124
 125 menuconfig EXPERT
 126         bool "Configure standard U-Boot features (expert users)"
 127         default y
 128         help
 129           This option allows certain base U-Boot options and settings
 130           to be disabled or tweaked. This is for specialized
 131           environments which can tolerate a "non-standard" U-Boot.
 132           Use this only if you really know what you are doing.
 133
 134 if EXPERT
 135         config SYS_MALLOC_CLEAR_ON_INIT
 136         bool "Init with zeros the memory reserved for malloc (slow)"
 137         default y
 138         help
 139           This setting is enabled by default. The reserved malloc
 140           memory is initialized with zeros, so first malloc calls
 141           will return the pointer to the zeroed memory. But this
 142           slows the boot time.
 143
 144           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 145           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 146           Then the boot time can be significantly reduced.
 147           Warning:
 148           When disabling this, please check if malloc calls, maybe
 149           should be replaced by calloc - if one expects zeroed memory.
 150
 151 config TOOLS_DEBUG
 152         bool "Enable debug information for tools"
 153         help
 154           Enable generation of debug information for tools such as mkimage.
 155           This can be used for debugging purposes. With debug information
 156           it is possible to set breakpoints on particular lines, single-step
 157           debug through the source code, etc.
 158
 159 endif # EXPERT
 160
 161 config PHYS_64BIT
 162         bool "64bit physical address support"
 163         help
 164           Say Y here to support 64bit physical memory address.
 165           This can be used not only for 64bit SoCs, but also for
 166           large physical address extention on 32bit SoCs.
 167
 168 config BUILD_ROM
 169         bool "Build U-Boot as BIOS replacement"
 170         depends on X86
 171         help
 172           This option allows to build a ROM version of U-Boot.
 173           The build process generally requires several binary blobs
 174           which are not shipped in the U-Boot source tree.
 175           Please, see doc/README.x86 for details.
 176
 177 endmenu         # General setup
 178
 179 menu "Boot images"
 180
 181 config ANDROID_BOOT_IMAGE
 182         bool "Enable support for Android Boot Images"
 183         default y if FASTBOOT
 184         help
 185           This enables support for booting images which use the Android
 186           image format header.
 187
 188 config FIT
 189         bool "Support Flattened Image Tree"
 190         select MD5
 191         select SHA1
 192         help
 193           This option allows you to boot the new uImage structure,
 194           Flattened Image Tree.  FIT is formally a FDT, which can include
 195           images of various types (kernel, FDT blob, ramdisk, etc.)
 196           in a single blob.  To boot this new uImage structure,
 197           pass the address of the blob to the "bootm" command.
 198           FIT is very flexible, supporting compression, multiple images,
 199           multiple configurations, verification through hashing and also
 200           verified boot (secure boot using RSA).
 201
 202 if FIT
 203
 204 config FIT_ENABLE_SHA256_SUPPORT
 205         bool "Support SHA256 checksum of FIT image contents"
 206         select SHA256
 207         default y
 208         help
 209           Enable this to support SHA256 checksum of FIT image contents. A
 210           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 211           the image contents have not been corrupted. SHA256 is recommended
 212           for use in secure applications since (as at 2016) there is no known
 213           feasible attack that could produce a 'collision' with differing
 214           input data. Use this for the highest security. Note that only the
 215           SHA256 variant is supported: SHA512 and others are not currently
 216           supported in U-Boot.
 217
 218 config FIT_SIGNATURE
 219         bool "Enable signature verification of FIT uImages"
 220         depends on DM
 221         select RSA
 222         help
 223           This option enables signature verification of FIT uImages,
 224           using a hash signed and verified using RSA. If
 225           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 226           hashing is available using hardware, then the RSA library will use
 227           it. See doc/uImage.FIT/signature.txt for more details.
 228
 229           WARNING: When relying on signed FIT images with a required signature
 230           check the legacy image format is disabled by default, so that
 231           unsigned images cannot be loaded. If a board needs the legacy image
 232           format support in this case, enable it using
 233           CONFIG_IMAGE_FORMAT_LEGACY.
 234
 235 config FIT_VERBOSE
 236         bool "Show verbose messages when FIT images fail"
 237         help
 238           Generally a system will have valid FIT images so debug messages
 239           are a waste of code space. If you are debugging your images then
 240           you can enable this option to get more verbose information about
 241           failures.
 242
 243 config FIT_BEST_MATCH
 244         bool "Select the best match for the kernel device tree"
 245         help
 246           When no configuration is explicitly selected, default to the
 247           one whose fdt's compatibility field best matches that of
 248           U-Boot itself. A match is considered "best" if it matches the
 249           most specific compatibility entry of U-Boot's fdt's root node.
 250           The order of entries in the configuration's fdt is ignored.
 251
 252 config FIT_IMAGE_POST_PROCESS
 253         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 254         depends on TI_SECURE_DEVICE
 255         help
 256           Allows doing any sort of manipulation to blobs after they got extracted
 257           from FIT images like stripping off headers or modifying the size of the
 258           blob, verification, authentication, decryption etc. in a platform or
 259           board specific way. In order to use this feature a platform or board-
 260           specific implementation of board_fit_image_post_process() must be
 261           provided. Also, anything done during this post-processing step would
 262           need to be comprehended in how the images were prepared before being
 263           injected into the FIT creation (i.e. the blobs would have been pre-
 264           processed before being added to the FIT image).
 265
 266 if SPL
 267
 268 config SPL_FIT
 269         bool "Support Flattened Image Tree within SPL"
 270         depends on SPL
 271         select SPL_OF_LIBFDT
 272
 273 config SPL_FIT_SIGNATURE
 274         bool "Enable signature verification of FIT firmware within SPL"
 275         depends on SPL_DM
 276         select SPL_FIT
 277         select SPL_RSA
 278
 279 config SPL_LOAD_FIT
 280         bool "Enable SPL loading U-Boot as a FIT"
 281         select SPL_FIT
 282         help
 283           Normally with the SPL framework a legacy image is generated as part
 284           of the build. This contains U-Boot along with information as to
 285           where it should be loaded. This option instead enables generation
 286           of a FIT (Flat Image Tree) which provides more flexibility. In
 287           particular it can handle selecting from multiple device tree
 288           and passing the correct one to U-Boot.
 289
 290 config SPL_FIT_IMAGE_POST_PROCESS
 291         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 292         depends on SPL_LOAD_FIT
 293         help
 294           Allows doing any sort of manipulation to blobs after they got extracted
 295           from the U-Boot FIT image like stripping off headers or modifying the
 296           size of the blob, verification, authentication, decryption etc. in a
 297           platform or board specific way. In order to use this feature a platform
 298           or board-specific implementation of board_fit_image_post_process() must
 299           be provided. Also, anything done during this post-processing step would
 300           need to be comprehended in how the images were prepared before being
 301           injected into the FIT creation (i.e. the blobs would have been pre-
 302           processed before being added to the FIT image).
 303
 304 config SPL_FIT_SOURCE
 305         string ".its source file for U-Boot FIT image"
 306         depends on SPL_FIT
 307         help
 308           Specifies a (platform specific) FIT source file to generate the
 309           U-Boot FIT image. This could specify further image to load and/or
 310           execute.
 311
 312 config SPL_FIT_GENERATOR
 313         string ".its file generator script for U-Boot FIT image"
 314         depends on SPL_FIT
 315         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 316         help
 317           Specifies a (platform specific) script file to generate the FIT
 318           source file used to build the U-Boot FIT image file. This gets
 319           passed a list of supported device tree file stub names to
 320           include in the generated image.
 321
 322 endif # SPL
 323
 324 endif # FIT
 325
 326 config OF_BOARD_SETUP
 327         bool "Set up board-specific details in device tree before boot"
 328         depends on OF_LIBFDT
 329         help
 330           This causes U-Boot to call ft_board_setup() before booting into
 331           the Operating System. This function can set up various
 332           board-specific information in the device tree for use by the OS.
 333           The device tree is then passed to the OS.
 334
 335 config OF_SYSTEM_SETUP
 336         bool "Set up system-specific details in device tree before boot"
 337         depends on OF_LIBFDT
 338         help
 339           This causes U-Boot to call ft_system_setup() before booting into
 340           the Operating System. This function can set up various
 341           system-specific information in the device tree for use by the OS.
 342           The device tree is then passed to the OS.
 343
 344 config OF_STDOUT_VIA_ALIAS
 345         bool "Update the device-tree stdout alias from U-Boot"
 346         depends on OF_LIBFDT
 347         help
 348           This uses U-Boot's serial alias from the aliases node to update
 349           the device tree passed to the OS. The "linux,stdout-path" property
 350           in the chosen node is set to point to the correct serial node.
 351           This option currently references CONFIG_CONS_INDEX, which is
 352           incorrect when used with device tree as this option does not
 353           exist / should not be used.
 354
 355 config SYS_EXTRA_OPTIONS
 356         string "Extra Options (DEPRECATED)"
 357         help
 358           The old configuration infrastructure (= mkconfig + boards.cfg)
 359           provided the extra options field. If you have something like
 360           "HAS_BAR,BAZ=64", the optional options
 361             #define CONFIG_HAS
 362             #define CONFIG_BAZ  64
 363           will be defined in include/config.h.
 364           This option was prepared for the smooth migration from the old
 365           configuration to Kconfig. Since this option will be removed sometime,
 366           new boards should not use this option.
 367
 368 config SYS_TEXT_BASE
 369         depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 370                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
 371                 ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS
 372         depends on !EFI_APP
 373         hex "Text Base"
 374         help
 375           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 376
 377         default 0x80800000 if ARCH_OMAP2PLUS
 378
 379
 380 config SYS_CLK_FREQ
 381         depends on ARC || ARCH_SUNXI
 382         int "CPU clock frequency"
 383         help
 384           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 385
 386 config ARCH_FIXUP_FDT_MEMORY
 387         bool "Enable arch_fixup_memory_banks() call"
 388         default y
 389         help
 390           Enable FDT memory map syncup before OS boot. This feature can be
 391           used for booting OS with different memory setup where the part of
 392           the memory location should be used for different purpose.
 393
 394 endmenu         # Boot images
 395
 396 source "api/Kconfig"
 397
 398 source "common/Kconfig"
 399
 400 source "cmd/Kconfig"
 401
 402 source "disk/Kconfig"
 403
 404 source "dts/Kconfig"
 405
 406 source "env/Kconfig"
 407
 408 source "net/Kconfig"
 409
 410 source "drivers/Kconfig"
 411
 412 source "fs/Kconfig"
 413
 414 source "lib/Kconfig"
 415
 416 source "test/Kconfig"