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 if NET
  73         select CMD_PXE if NET
  74         select CMD_EXT2
  75         select CMD_EXT4
  76         select CMD_FAT
  77         select CMD_FS_GENERIC
  78         select CMD_MII if NET
  79         select CMD_PING if NET
  80         select CMD_PART if PARTITIONS
  81         select HUSH_PARSER
  82         select BOOTP_BOOTPATH if NET
  83         select BOOTP_DNS if NET
  84         select BOOTP_GATEWAY if NET
  85         select BOOTP_HOSTNAME if NET
  86         select BOOTP_PXE if NET
  87         select BOOTP_SUBNETMASK if NET
  88         select CMDLINE_EDITING
  89         select AUTO_COMPLETE
  90         select SYS_LONGHELP
  91         select SUPPORT_RAW_INITRD
  92         select ENV_VARS_UBOOT_CONFIG
  93         help
  94           Select this to enable various options and commands which are suitable
  95           for building u-boot for booting general purpose Linux distributions.
  96
  97 config ENV_VARS_UBOOT_CONFIG
  98         bool "Add arch, board, vendor and soc variables to default environment"
  99         help
 100           Define this in order to add variables describing the
 101           U-Boot build configuration to the default environment.
 102           These will be named arch, cpu, board, vendor, and soc.
 103           Enabling this option will cause the following to be defined:
 104           - CONFIG_SYS_ARCH
 105           - CONFIG_SYS_CPU
 106           - CONFIG_SYS_BOARD
 107           - CONFIG_SYS_VENDOR
 108           - CONFIG_SYS_SOC
 109
 110 config SYS_BOOT_GET_CMDLINE
 111         bool "Enable kernel command line setup"
 112         help
 113           Enables allocating and saving kernel cmdline in space between
 114           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 115
 116 config SYS_BOOT_GET_KBD
 117         bool "Enable kernel board information setup"
 118         help
 119           Enables allocating and saving a kernel copy of the bd_info in
 120           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 121
 122 config SYS_MALLOC_F
 123         bool "Enable malloc() pool before relocation"
 124         default y if DM
 125         help
 126           Before relocation, memory is very limited on many platforms. Still,
 127           we can provide a small malloc() pool if needed. Driver model in
 128           particular needs this to operate, so that it can allocate the
 129           initial serial device and any others that are needed.
 130
 131 config SYS_MALLOC_F_LEN
 132         hex "Size of malloc() pool before relocation"
 133         depends on SYS_MALLOC_F
 134         default 0x400
 135         help
 136           Before relocation, memory is very limited on many platforms. Still,
 137           we can provide a small malloc() pool if needed. Driver model in
 138           particular needs this to operate, so that it can allocate the
 139           initial serial device and any others that are needed.
 140
 141 config SPL_SYS_MALLOC_F_LEN
 142         hex "Size of malloc() pool in SPL before relocation"
 143         depends on SYS_MALLOC_F
 144         default SYS_MALLOC_F_LEN
 145         help
 146           Before relocation, memory is very limited on many platforms. Still,
 147           we can provide a small malloc() pool if needed. Driver model in
 148           particular needs this to operate, so that it can allocate the
 149           initial serial device and any others that are needed.
 150
 151 config TPL_SYS_MALLOC_F_LEN
 152         hex "Size of malloc() pool in TPL before relocation"
 153         depends on SYS_MALLOC_F
 154         default SYS_MALLOC_F_LEN
 155         help
 156           Before relocation, memory is very limited on many platforms. Still,
 157           we can provide a small malloc() pool if needed. Driver model in
 158           particular needs this to operate, so that it can allocate the
 159           initial serial device and any others that are needed.
 160
 161 menuconfig EXPERT
 162         bool "Configure standard U-Boot features (expert users)"
 163         default y
 164         help
 165           This option allows certain base U-Boot options and settings
 166           to be disabled or tweaked. This is for specialized
 167           environments which can tolerate a "non-standard" U-Boot.
 168           Use this only if you really know what you are doing.
 169
 170 if EXPERT
 171         config SYS_MALLOC_CLEAR_ON_INIT
 172         bool "Init with zeros the memory reserved for malloc (slow)"
 173         default y
 174         help
 175           This setting is enabled by default. The reserved malloc
 176           memory is initialized with zeros, so first malloc calls
 177           will return the pointer to the zeroed memory. But this
 178           slows the boot time.
 179
 180           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 181           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 182           Then the boot time can be significantly reduced.
 183           Warning:
 184           When disabling this, please check if malloc calls, maybe
 185           should be replaced by calloc - if one expects zeroed memory.
 186
 187 config TOOLS_DEBUG
 188         bool "Enable debug information for tools"
 189         help
 190           Enable generation of debug information for tools such as mkimage.
 191           This can be used for debugging purposes. With debug information
 192           it is possible to set breakpoints on particular lines, single-step
 193           debug through the source code, etc.
 194
 195 endif # EXPERT
 196
 197 config PHYS_64BIT
 198         bool "64bit physical address support"
 199         help
 200           Say Y here to support 64bit physical memory address.
 201           This can be used not only for 64bit SoCs, but also for
 202           large physical address extention on 32bit SoCs.
 203
 204 config BUILD_ROM
 205         bool "Build U-Boot as BIOS replacement"
 206         depends on X86
 207         help
 208           This option allows to build a ROM version of U-Boot.
 209           The build process generally requires several binary blobs
 210           which are not shipped in the U-Boot source tree.
 211           Please, see doc/README.x86 for details.
 212
 213 endmenu         # General setup
 214
 215 menu "Boot images"
 216
 217 config ANDROID_BOOT_IMAGE
 218         bool "Enable support for Android Boot Images"
 219         default y if FASTBOOT
 220         help
 221           This enables support for booting images which use the Android
 222           image format header.
 223
 224 config FIT
 225         bool "Support Flattened Image Tree"
 226         select MD5
 227         select SHA1
 228         help
 229           This option allows you to boot the new uImage structure,
 230           Flattened Image Tree.  FIT is formally a FDT, which can include
 231           images of various types (kernel, FDT blob, ramdisk, etc.)
 232           in a single blob.  To boot this new uImage structure,
 233           pass the address of the blob to the "bootm" command.
 234           FIT is very flexible, supporting compression, multiple images,
 235           multiple configurations, verification through hashing and also
 236           verified boot (secure boot using RSA).
 237
 238 if FIT
 239
 240 config FIT_ENABLE_SHA256_SUPPORT
 241         bool "Support SHA256 checksum of FIT image contents"
 242         select SHA256
 243         default y
 244         help
 245           Enable this to support SHA256 checksum of FIT image contents. A
 246           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 247           the image contents have not been corrupted. SHA256 is recommended
 248           for use in secure applications since (as at 2016) there is no known
 249           feasible attack that could produce a 'collision' with differing
 250           input data. Use this for the highest security. Note that only the
 251           SHA256 variant is supported: SHA512 and others are not currently
 252           supported in U-Boot.
 253
 254 config FIT_SIGNATURE
 255         bool "Enable signature verification of FIT uImages"
 256         depends on DM
 257         select RSA
 258         help
 259           This option enables signature verification of FIT uImages,
 260           using a hash signed and verified using RSA. If
 261           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 262           hashing is available using hardware, then the RSA library will use
 263           it. See doc/uImage.FIT/signature.txt for more details.
 264
 265           WARNING: When relying on signed FIT images with a required signature
 266           check the legacy image format is disabled by default, so that
 267           unsigned images cannot be loaded. If a board needs the legacy image
 268           format support in this case, enable it using
 269           CONFIG_IMAGE_FORMAT_LEGACY.
 270
 271 config FIT_VERBOSE
 272         bool "Show verbose messages when FIT images fail"
 273         help
 274           Generally a system will have valid FIT images so debug messages
 275           are a waste of code space. If you are debugging your images then
 276           you can enable this option to get more verbose information about
 277           failures.
 278
 279 config FIT_BEST_MATCH
 280         bool "Select the best match for the kernel device tree"
 281         help
 282           When no configuration is explicitly selected, default to the
 283           one whose fdt's compatibility field best matches that of
 284           U-Boot itself. A match is considered "best" if it matches the
 285           most specific compatibility entry of U-Boot's fdt's root node.
 286           The order of entries in the configuration's fdt is ignored.
 287
 288 config FIT_IMAGE_POST_PROCESS
 289         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 290         depends on TI_SECURE_DEVICE
 291         help
 292           Allows doing any sort of manipulation to blobs after they got extracted
 293           from FIT images like stripping off headers or modifying the size of the
 294           blob, verification, authentication, decryption etc. in a platform or
 295           board specific way. In order to use this feature a platform or board-
 296           specific implementation of board_fit_image_post_process() must be
 297           provided. Also, anything done during this post-processing step would
 298           need to be comprehended in how the images were prepared before being
 299           injected into the FIT creation (i.e. the blobs would have been pre-
 300           processed before being added to the FIT image).
 301
 302 if SPL
 303
 304 config SPL_FIT
 305         bool "Support Flattened Image Tree within SPL"
 306         depends on SPL
 307         select SPL_OF_LIBFDT
 308
 309 config SPL_FIT_SIGNATURE
 310         bool "Enable signature verification of FIT firmware within SPL"
 311         depends on SPL_DM
 312         select SPL_FIT
 313         select SPL_RSA
 314
 315 config SPL_LOAD_FIT
 316         bool "Enable SPL loading U-Boot as a FIT"
 317         select SPL_FIT
 318         help
 319           Normally with the SPL framework a legacy image is generated as part
 320           of the build. This contains U-Boot along with information as to
 321           where it should be loaded. This option instead enables generation
 322           of a FIT (Flat Image Tree) which provides more flexibility. In
 323           particular it can handle selecting from multiple device tree
 324           and passing the correct one to U-Boot.
 325
 326 config SPL_FIT_IMAGE_POST_PROCESS
 327         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 328         depends on SPL_LOAD_FIT
 329         help
 330           Allows doing any sort of manipulation to blobs after they got extracted
 331           from the U-Boot FIT image like stripping off headers or modifying the
 332           size of the blob, verification, authentication, decryption etc. in a
 333           platform or board specific way. In order to use this feature a platform
 334           or board-specific implementation of board_fit_image_post_process() must
 335           be provided. Also, anything done during this post-processing step would
 336           need to be comprehended in how the images were prepared before being
 337           injected into the FIT creation (i.e. the blobs would have been pre-
 338           processed before being added to the FIT image).
 339
 340 config SPL_FIT_SOURCE
 341         string ".its source file for U-Boot FIT image"
 342         depends on SPL_FIT
 343         help
 344           Specifies a (platform specific) FIT source file to generate the
 345           U-Boot FIT image. This could specify further image to load and/or
 346           execute.
 347
 348 config SPL_FIT_GENERATOR
 349         string ".its file generator script for U-Boot FIT image"
 350         depends on SPL_FIT
 351         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 352         help
 353           Specifies a (platform specific) script file to generate the FIT
 354           source file used to build the U-Boot FIT image file. This gets
 355           passed a list of supported device tree file stub names to
 356           include in the generated image.
 357
 358 endif # SPL
 359
 360 endif # FIT
 361
 362 config OF_BOARD_SETUP
 363         bool "Set up board-specific details in device tree before boot"
 364         depends on OF_LIBFDT
 365         help
 366           This causes U-Boot to call ft_board_setup() before booting into
 367           the Operating System. This function can set up various
 368           board-specific information in the device tree for use by the OS.
 369           The device tree is then passed to the OS.
 370
 371 config OF_SYSTEM_SETUP
 372         bool "Set up system-specific details in device tree before boot"
 373         depends on OF_LIBFDT
 374         help
 375           This causes U-Boot to call ft_system_setup() before booting into
 376           the Operating System. This function can set up various
 377           system-specific information in the device tree for use by the OS.
 378           The device tree is then passed to the OS.
 379
 380 config OF_STDOUT_VIA_ALIAS
 381         bool "Update the device-tree stdout alias from U-Boot"
 382         depends on OF_LIBFDT
 383         help
 384           This uses U-Boot's serial alias from the aliases node to update
 385           the device tree passed to the OS. The "linux,stdout-path" property
 386           in the chosen node is set to point to the correct serial node.
 387           This option currently references CONFIG_CONS_INDEX, which is
 388           incorrect when used with device tree as this option does not
 389           exist / should not be used.
 390
 391 config SYS_EXTRA_OPTIONS
 392         string "Extra Options (DEPRECATED)"
 393         help
 394           The old configuration infrastructure (= mkconfig + boards.cfg)
 395           provided the extra options field. If you have something like
 396           "HAS_BAR,BAZ=64", the optional options
 397             #define CONFIG_HAS
 398             #define CONFIG_BAZ  64
 399           will be defined in include/config.h.
 400           This option was prepared for the smooth migration from the old
 401           configuration to Kconfig. Since this option will be removed sometime,
 402           new boards should not use this option.
 403
 404 config SYS_TEXT_BASE
 405         depends on !NIOS2 && !XTENSA
 406         depends on !EFI_APP
 407         default 0x80800000 if ARCH_OMAP2PLUS
 408         hex "Text Base"
 409         help
 410           The address in memory that U-Boot will be running from, initially.
 411
 412
 413
 414 config SYS_CLK_FREQ
 415         depends on ARC || ARCH_SUNXI
 416         int "CPU clock frequency"
 417         help
 418           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 419
 420 config ARCH_FIXUP_FDT_MEMORY
 421         bool "Enable arch_fixup_memory_banks() call"
 422         default y
 423         help
 424           Enable FDT memory map syncup before OS boot. This feature can be
 425           used for booting OS with different memory setup where the part of
 426           the memory location should be used for different purpose.
 427
 428 endmenu         # Boot images
 429
 430 source "api/Kconfig"
 431
 432 source "common/Kconfig"
 433
 434 source "cmd/Kconfig"
 435
 436 source "disk/Kconfig"
 437
 438 source "dts/Kconfig"
 439
 440 source "env/Kconfig"
 441
 442 source "net/Kconfig"
 443
 444 source "drivers/Kconfig"
 445
 446 source "fs/Kconfig"
 447
 448 source "lib/Kconfig"
 449
 450 source "test/Kconfig"