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 CC_COVERAGE
  63         bool "Enable code coverage analysis"
  64         depends on SANDBOX
  65         help
  66           Enabling this option will pass "--coverage" to gcc to compile
  67           and link code instrumented for coverage analysis.
  68
  69 config DISTRO_DEFAULTS
  70         bool "Select defaults suitable for booting general purpose Linux distributions"
  71         imply USE_BOOTCOMMAND
  72         select CMD_BOOTZ if ARM && !ARM64
  73         select CMD_BOOTI if ARM64
  74         select CMD_DHCP if CMD_NET
  75         select CMD_PING if CMD_NET
  76         select CMD_PXE if NET
  77         select CMD_ENV_EXISTS
  78         select CMD_EXT2
  79         select CMD_EXT4
  80         select CMD_FAT
  81         select CMD_FS_GENERIC
  82         imply CMD_MII if NET
  83         select CMD_PART if PARTITIONS
  84         select HUSH_PARSER
  85         select CMDLINE_EDITING
  86         select AUTO_COMPLETE
  87         select SYS_LONGHELP
  88         select SUPPORT_RAW_INITRD
  89         select ENV_VARS_UBOOT_CONFIG
  90         help
  91           Select this to enable various options and commands which are suitable
  92           for building u-boot for booting general purpose Linux distributions.
  93
  94 config ENV_VARS_UBOOT_CONFIG
  95         bool "Add arch, board, vendor and soc variables to default environment"
  96         help
  97           Define this in order to add variables describing the
  98           U-Boot build configuration to the default environment.
  99           These will be named arch, cpu, board, vendor, and soc.
 100           Enabling this option will cause the following to be defined:
 101           - CONFIG_SYS_ARCH
 102           - CONFIG_SYS_CPU
 103           - CONFIG_SYS_BOARD
 104           - CONFIG_SYS_VENDOR
 105           - CONFIG_SYS_SOC
 106
 107 config SYS_BOOT_GET_CMDLINE
 108         bool "Enable kernel command line setup"
 109         help
 110           Enables allocating and saving kernel cmdline in space between
 111           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 112
 113 config SYS_BOOT_GET_KBD
 114         bool "Enable kernel board information setup"
 115         help
 116           Enables allocating and saving a kernel copy of the bd_info in
 117           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 118
 119 config SYS_MALLOC_F
 120         bool "Enable malloc() pool before relocation"
 121         default y if DM
 122         help
 123           Before relocation, memory is very limited on many platforms. Still,
 124           we can provide a small malloc() pool if needed. Driver model in
 125           particular needs this to operate, so that it can allocate the
 126           initial serial device and any others that are needed.
 127
 128 config SYS_MALLOC_F_LEN
 129         hex "Size of malloc() pool before relocation"
 130         depends on SYS_MALLOC_F
 131         default 0x1000 if AM33XX
 132         default 0x400
 133         help
 134           Before relocation, memory is very limited on many platforms. Still,
 135           we can provide a small malloc() pool if needed. Driver model in
 136           particular needs this to operate, so that it can allocate the
 137           initial serial device and any others that are needed.
 138
 139 config SPL_SYS_MALLOC_F_LEN
 140         hex "Size of malloc() pool in SPL before relocation"
 141         depends on SYS_MALLOC_F
 142         default SYS_MALLOC_F_LEN
 143         help
 144           Before relocation, memory is very limited on many platforms. Still,
 145           we can provide a small malloc() pool if needed. Driver model in
 146           particular needs this to operate, so that it can allocate the
 147           initial serial device and any others that are needed.
 148
 149 config TPL_SYS_MALLOC_F_LEN
 150         hex "Size of malloc() pool in TPL before relocation"
 151         depends on SYS_MALLOC_F
 152         default SYS_MALLOC_F_LEN
 153         help
 154           Before relocation, memory is very limited on many platforms. Still,
 155           we can provide a small malloc() pool if needed. Driver model in
 156           particular needs this to operate, so that it can allocate the
 157           initial serial device and any others that are needed.
 158
 159 menuconfig EXPERT
 160         bool "Configure standard U-Boot features (expert users)"
 161         default y
 162         help
 163           This option allows certain base U-Boot options and settings
 164           to be disabled or tweaked. This is for specialized
 165           environments which can tolerate a "non-standard" U-Boot.
 166           Use this only if you really know what you are doing.
 167
 168 if EXPERT
 169         config SYS_MALLOC_CLEAR_ON_INIT
 170         bool "Init with zeros the memory reserved for malloc (slow)"
 171         default y
 172         help
 173           This setting is enabled by default. The reserved malloc
 174           memory is initialized with zeros, so first malloc calls
 175           will return the pointer to the zeroed memory. But this
 176           slows the boot time.
 177
 178           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 179           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 180           Then the boot time can be significantly reduced.
 181           Warning:
 182           When disabling this, please check if malloc calls, maybe
 183           should be replaced by calloc - if one expects zeroed memory.
 184
 185 config TOOLS_DEBUG
 186         bool "Enable debug information for tools"
 187         help
 188           Enable generation of debug information for tools such as mkimage.
 189           This can be used for debugging purposes. With debug information
 190           it is possible to set breakpoints on particular lines, single-step
 191           debug through the source code, etc.
 192
 193 endif # EXPERT
 194
 195 config PHYS_64BIT
 196         bool "64bit physical address support"
 197         help
 198           Say Y here to support 64bit physical memory address.
 199           This can be used not only for 64bit SoCs, but also for
 200           large physical address extention on 32bit SoCs.
 201
 202 config BUILD_ROM
 203         bool "Build U-Boot as BIOS replacement"
 204         depends on X86
 205         help
 206           This option allows to build a ROM version of U-Boot.
 207           The build process generally requires several binary blobs
 208           which are not shipped in the U-Boot source tree.
 209           Please, see doc/README.x86 for details.
 210
 211 endmenu         # General setup
 212
 213 menu "Boot images"
 214
 215 config ANDROID_BOOT_IMAGE
 216         bool "Enable support for Android Boot Images"
 217         default y if FASTBOOT
 218         help
 219           This enables support for booting images which use the Android
 220           image format header.
 221
 222 config FIT
 223         bool "Support Flattened Image Tree"
 224         select MD5
 225         select SHA1
 226         help
 227           This option allows you to boot the new uImage structure,
 228           Flattened Image Tree.  FIT is formally a FDT, which can include
 229           images of various types (kernel, FDT blob, ramdisk, etc.)
 230           in a single blob.  To boot this new uImage structure,
 231           pass the address of the blob to the "bootm" command.
 232           FIT is very flexible, supporting compression, multiple images,
 233           multiple configurations, verification through hashing and also
 234           verified boot (secure boot using RSA).
 235
 236 if FIT
 237
 238 config FIT_ENABLE_SHA256_SUPPORT
 239         bool "Support SHA256 checksum of FIT image contents"
 240         select SHA256
 241         default y
 242         help
 243           Enable this to support SHA256 checksum of FIT image contents. A
 244           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 245           the image contents have not been corrupted. SHA256 is recommended
 246           for use in secure applications since (as at 2016) there is no known
 247           feasible attack that could produce a 'collision' with differing
 248           input data. Use this for the highest security. Note that only the
 249           SHA256 variant is supported: SHA512 and others are not currently
 250           supported in U-Boot.
 251
 252 config FIT_SIGNATURE
 253         bool "Enable signature verification of FIT uImages"
 254         depends on DM
 255         select RSA
 256         help
 257           This option enables signature verification of FIT uImages,
 258           using a hash signed and verified using RSA. If
 259           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 260           hashing is available using hardware, then the RSA library will use
 261           it. See doc/uImage.FIT/signature.txt for more details.
 262
 263           WARNING: When relying on signed FIT images with a required signature
 264           check the legacy image format is disabled by default, so that
 265           unsigned images cannot be loaded. If a board needs the legacy image
 266           format support in this case, enable it using
 267           CONFIG_IMAGE_FORMAT_LEGACY.
 268
 269 config FIT_VERBOSE
 270         bool "Show verbose messages when FIT images fail"
 271         help
 272           Generally a system will have valid FIT images so debug messages
 273           are a waste of code space. If you are debugging your images then
 274           you can enable this option to get more verbose information about
 275           failures.
 276
 277 config FIT_BEST_MATCH
 278         bool "Select the best match for the kernel device tree"
 279         help
 280           When no configuration is explicitly selected, default to the
 281           one whose fdt's compatibility field best matches that of
 282           U-Boot itself. A match is considered "best" if it matches the
 283           most specific compatibility entry of U-Boot's fdt's root node.
 284           The order of entries in the configuration's fdt is ignored.
 285
 286 config FIT_IMAGE_POST_PROCESS
 287         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 288         depends on TI_SECURE_DEVICE
 289         help
 290           Allows doing any sort of manipulation to blobs after they got extracted
 291           from FIT images like stripping off headers or modifying the size of the
 292           blob, verification, authentication, decryption etc. in a platform or
 293           board specific way. In order to use this feature a platform or board-
 294           specific implementation of board_fit_image_post_process() must be
 295           provided. Also, anything done during this post-processing step would
 296           need to be comprehended in how the images were prepared before being
 297           injected into the FIT creation (i.e. the blobs would have been pre-
 298           processed before being added to the FIT image).
 299
 300 if SPL
 301
 302 config SPL_FIT
 303         bool "Support Flattened Image Tree within SPL"
 304         depends on SPL
 305         select SPL_OF_LIBFDT
 306
 307 config SPL_FIT_SIGNATURE
 308         bool "Enable signature verification of FIT firmware within SPL"
 309         depends on SPL_DM
 310         select SPL_FIT
 311         select SPL_RSA
 312
 313 config SPL_LOAD_FIT
 314         bool "Enable SPL loading U-Boot as a FIT"
 315         select SPL_FIT
 316         help
 317           Normally with the SPL framework a legacy image is generated as part
 318           of the build. This contains U-Boot along with information as to
 319           where it should be loaded. This option instead enables generation
 320           of a FIT (Flat Image Tree) which provides more flexibility. In
 321           particular it can handle selecting from multiple device tree
 322           and passing the correct one to U-Boot.
 323
 324 config SPL_FIT_IMAGE_POST_PROCESS
 325         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 326         depends on SPL_LOAD_FIT
 327         help
 328           Allows doing any sort of manipulation to blobs after they got extracted
 329           from the U-Boot FIT image like stripping off headers or modifying the
 330           size of the blob, verification, authentication, decryption etc. in a
 331           platform or board specific way. In order to use this feature a platform
 332           or board-specific implementation of board_fit_image_post_process() must
 333           be provided. Also, anything done during this post-processing step would
 334           need to be comprehended in how the images were prepared before being
 335           injected into the FIT creation (i.e. the blobs would have been pre-
 336           processed before being added to the FIT image).
 337
 338 config SPL_FIT_SOURCE
 339         string ".its source file for U-Boot FIT image"
 340         depends on SPL_FIT
 341         help
 342           Specifies a (platform specific) FIT source file to generate the
 343           U-Boot FIT image. This could specify further image to load and/or
 344           execute.
 345
 346 config SPL_FIT_GENERATOR
 347         string ".its file generator script for U-Boot FIT image"
 348         depends on SPL_FIT
 349         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 350         help
 351           Specifies a (platform specific) script file to generate the FIT
 352           source file used to build the U-Boot FIT image file. This gets
 353           passed a list of supported device tree file stub names to
 354           include in the generated image.
 355
 356 endif # SPL
 357
 358 endif # FIT
 359
 360 config IMAGE_FORMAT_LEGACY
 361         bool "Enable support for the legacy image format"
 362         default y if !FIT_SIGNATURE
 363         help
 364           This option enables the legacy image format. It is enabled by
 365           default for backward compatibility, unless FIT_SIGNATURE is
 366           set where it is disabled so that unsigned images cannot be
 367           loaded. If a board needs the legacy image format support in this
 368           case, enable it here.
 369
 370 config OF_BOARD_SETUP
 371         bool "Set up board-specific details in device tree before boot"
 372         depends on OF_LIBFDT
 373         help
 374           This causes U-Boot to call ft_board_setup() before booting into
 375           the Operating System. This function can set up various
 376           board-specific information in the device tree for use by the OS.
 377           The device tree is then passed to the OS.
 378
 379 config OF_SYSTEM_SETUP
 380         bool "Set up system-specific details in device tree before boot"
 381         depends on OF_LIBFDT
 382         help
 383           This causes U-Boot to call ft_system_setup() before booting into
 384           the Operating System. This function can set up various
 385           system-specific information in the device tree for use by the OS.
 386           The device tree is then passed to the OS.
 387
 388 config OF_STDOUT_VIA_ALIAS
 389         bool "Update the device-tree stdout alias from U-Boot"
 390         depends on OF_LIBFDT
 391         help
 392           This uses U-Boot's serial alias from the aliases node to update
 393           the device tree passed to the OS. The "linux,stdout-path" property
 394           in the chosen node is set to point to the correct serial node.
 395           This option currently references CONFIG_CONS_INDEX, which is
 396           incorrect when used with device tree as this option does not
 397           exist / should not be used.
 398
 399 config SYS_EXTRA_OPTIONS
 400         string "Extra Options (DEPRECATED)"
 401         help
 402           The old configuration infrastructure (= mkconfig + boards.cfg)
 403           provided the extra options field. If you have something like
 404           "HAS_BAR,BAZ=64", the optional options
 405             #define CONFIG_HAS
 406             #define CONFIG_BAZ  64
 407           will be defined in include/config.h.
 408           This option was prepared for the smooth migration from the old
 409           configuration to Kconfig. Since this option will be removed sometime,
 410           new boards should not use this option.
 411
 412 config SYS_TEXT_BASE
 413         depends on !NIOS2 && !XTENSA
 414         depends on !EFI_APP
 415         default 0x80800000 if ARCH_OMAP2PLUS
 416         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 417         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 418         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 419         hex "Text Base"
 420         help
 421           The address in memory that U-Boot will be running from, initially.
 422
 423
 424
 425 config SYS_CLK_FREQ
 426         depends on ARC || ARCH_SUNXI
 427         int "CPU clock frequency"
 428         help
 429           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 430
 431 config ARCH_FIXUP_FDT_MEMORY
 432         bool "Enable arch_fixup_memory_banks() call"
 433         default y
 434         help
 435           Enable FDT memory map syncup before OS boot. This feature can be
 436           used for booting OS with different memory setup where the part of
 437           the memory location should be used for different purpose.
 438
 439 endmenu         # Boot images
 440
 441 source "api/Kconfig"
 442
 443 source "common/Kconfig"
 444
 445 source "cmd/Kconfig"
 446
 447 source "disk/Kconfig"
 448
 449 source "dts/Kconfig"
 450
 451 source "env/Kconfig"
 452
 453 source "net/Kconfig"
 454
 455 source "drivers/Kconfig"
 456
 457 source "fs/Kconfig"
 458
 459 source "lib/Kconfig"
 460
 461 source "test/Kconfig"