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
  59         default n
  60         select CMD_BOOTZ
  61         select CMD_DHCP
  62         select CMD_EXT2
  63         select CMD_EXT4
  64         select CMD_FAT
  65         select CMD_FS_GENERIC
  66         select CMD_MII
  67         select CMD_PING
  68         select HUSH_PARSER
  69         help
  70           Select this to enable various options and commands which are suitable
  71           for building u-boot for booting general purpose Linux distributions.
  72
  73 config SYS_MALLOC_F
  74         bool "Enable malloc() pool before relocation"
  75         default y if DM
  76         help
  77           Before relocation, memory is very limited on many platforms. Still,
  78           we can provide a small malloc() pool if needed. Driver model in
  79           particular needs this to operate, so that it can allocate the
  80           initial serial device and any others that are needed.
  81
  82 config SYS_MALLOC_F_LEN
  83         hex "Size of malloc() pool before relocation"
  84         depends on SYS_MALLOC_F
  85         default 0x400
  86         help
  87           Before relocation, memory is very limited on many platforms. Still,
  88           we can provide a small malloc() pool if needed. Driver model in
  89           particular needs this to operate, so that it can allocate the
  90           initial serial device and any others that are needed.
  91
  92 menuconfig EXPERT
  93         bool "Configure standard U-Boot features (expert users)"
  94         default y
  95         help
  96           This option allows certain base U-Boot options and settings
  97           to be disabled or tweaked. This is for specialized
  98           environments which can tolerate a "non-standard" U-Boot.
  99           Use this only if you really know what you are doing.
 100
 101 if EXPERT
 102         config SYS_MALLOC_CLEAR_ON_INIT
 103         bool "Init with zeros the memory reserved for malloc (slow)"
 104         default y
 105         help
 106           This setting is enabled by default. The reserved malloc
 107           memory is initialized with zeros, so first malloc calls
 108           will return the pointer to the zeroed memory. But this
 109           slows the boot time.
 110
 111           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 112           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 113           Then the boot time can be significantly reduced.
 114           Warning:
 115           When disabling this, please check if malloc calls, maybe
 116           should be replaced by calloc - if one expects zeroed memory.
 117
 118 config TOOLS_DEBUG
 119         bool "Enable debug information for tools"
 120         help
 121           Enable generation of debug information for tools such as mkimage.
 122           This can be used for debugging purposes. With debug information
 123           it is possible to set breakpoints on particular lines, single-step
 124           debug through the source code, etc.
 125
 126 endif
 127
 128 config PHYS_64BIT
 129         bool "64bit physical address support"
 130         help
 131           Say Y here to support 64bit physical memory address.
 132           This can be used not only for 64bit SoCs, but also for
 133           large physical address extention on 32bit SoCs.
 134
 135 endmenu         # General setup
 136
 137 menu "Boot images"
 138
 139 config SUPPORT_SPL
 140         bool
 141
 142 config SUPPORT_TPL
 143         bool
 144
 145 config SPL
 146         bool
 147         depends on SUPPORT_SPL
 148         prompt "Enable SPL"
 149         help
 150           If you want to build SPL as well as the normal image, say Y.
 151
 152 config SPL_SYS_MALLOC_SIMPLE
 153         bool
 154         depends on SPL
 155         prompt "Only use malloc_simple functions in the SPL"
 156         help
 157           Say Y here to only use the *_simple malloc functions from
 158           malloc_simple.c, rather then using the versions from dlmalloc.c;
 159           this will make the SPL binary smaller at the cost of more heap
 160           usage as the *_simple malloc functions do not re-use free-ed mem.
 161
 162 config SPL_STACK_R
 163         depends on SPL
 164         bool "Enable SDRAM location for SPL stack"
 165         help
 166           SPL starts off execution in SRAM and thus typically has only a small
 167           stack available. Since SPL sets up DRAM while in its board_init_f()
 168           function, it is possible for the stack to move there before
 169           board_init_r() is reached. This option enables a special SDRAM
 170           location for the SPL stack. U-Boot SPL switches to this after
 171           board_init_f() completes, and before board_init_r() starts.
 172
 173 config SPL_STACK_R_ADDR
 174         depends on SPL_STACK_R
 175         hex "SDRAM location for SPL stack"
 176         help
 177           Specify the address in SDRAM for the SPL stack. This will be set up
 178           before board_init_r() is called.
 179
 180 config SPL_STACK_R_MALLOC_SIMPLE_LEN
 181         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
 182         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
 183         default 0x100000
 184         help
 185           Specify the amount of the stack to use as memory pool for
 186           malloc_simple after switching the stack to DRAM. This may be set
 187           to give board_init_r() a larger heap then the initial heap in
 188           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
 189
 190 config SPL_SEPARATE_BSS
 191         depends on SPL
 192         bool "BSS section is in a different memory region from text"
 193         help
 194           Some platforms need a large BSS region in SPL and can provide this
 195           because RAM is already set up. In this case BSS can be moved to RAM.
 196           This option should then be enabled so that the correct device tree
 197           location is used. Normally we put the device tree at the end of BSS
 198           but with this option enabled, it goes at _image_binary_end.
 199
 200 config TPL
 201         bool
 202         depends on SPL && SUPPORT_TPL
 203         prompt "Enable TPL"
 204         help
 205           If you want to build TPL as well as the normal image and SPL, say Y.
 206
 207 config FIT
 208         bool "Support Flattened Image Tree"
 209         help
 210           This option allows to boot the new uImage structrure,
 211           Flattened Image Tree.  FIT is formally a FDT, which can include
 212           images of various types (kernel, FDT blob, ramdisk, etc.)
 213           in a single blob.  To boot this new uImage structure,
 214           pass the address of the blob to the "bootm" command.
 215           FIT is very flexible, supporting compression, multiple images,
 216           multiple configurations, verification through hashing and also
 217           verified boot (secure boot using RSA). This option enables that
 218           feature.
 219
 220 config SPL_FIT
 221         bool "Support Flattened Image Tree within SPL"
 222         depends on FIT
 223         depends on SPL
 224
 225 config FIT_VERBOSE
 226         bool "Display verbose messages on FIT boot"
 227         depends on FIT
 228
 229 config FIT_SIGNATURE
 230         bool "Enable signature verification of FIT uImages"
 231         depends on FIT
 232         depends on DM
 233         select RSA
 234         help
 235           This option enables signature verification of FIT uImages,
 236           using a hash signed and verified using RSA. If
 237           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 238           hashing is available using hardware, then then RSA library will use
 239           it. See doc/uImage.FIT/signature.txt for more details.
 240
 241           WARNING: When relying on signed FIT images with a required signature
 242           check the legacy image format is disabled by default, so that
 243           unsigned images cannot be loaded. If a board needs the legacy image
 244           format support in this case, enable it using
 245           CONFIG_IMAGE_FORMAT_LEGACY.
 246
 247 config SPL_FIT_SIGNATURE
 248         bool "Enable signature verification of FIT firmware within SPL"
 249         depends on SPL_FIT
 250         depends on SPL_DM
 251         select SPL_RSA
 252
 253 config FIT_BEST_MATCH
 254         bool "Select the best match for the kernel device tree"
 255         depends on FIT
 256         help
 257           When no configuration is explicitly selected, default to the
 258           one whose fdt's compatibility field best matches that of
 259           U-Boot itself. A match is considered "best" if it matches the
 260           most specific compatibility entry of U-Boot's fdt's root node.
 261           The order of entries in the configuration's fdt is ignored.
 262
 263 config FIT_VERBOSE
 264         bool "Show verbose messages when FIT images fails"
 265         depends on FIT
 266         help
 267           Generally a system will have valid FIT images so debug messages
 268           are a waste of code space. If you are debugging your images then
 269           you can enable this option to get more verbose information about
 270           failures.
 271
 272 config OF_BOARD_SETUP
 273         bool "Set up board-specific details in device tree before boot"
 274         depends on OF_LIBFDT
 275         help
 276           This causes U-Boot to call ft_board_setup() before booting into
 277           the Operating System. This function can set up various
 278           board-specific information in the device tree for use by the OS.
 279           The device tree is then passed to the OS.
 280
 281 config OF_SYSTEM_SETUP
 282         bool "Set up system-specific details in device tree before boot"
 283         depends on OF_LIBFDT
 284         help
 285           This causes U-Boot to call ft_system_setup() before booting into
 286           the Operating System. This function can set up various
 287           system-specific information in the device tree for use by the OS.
 288           The device tree is then passed to the OS.
 289
 290 config OF_STDOUT_VIA_ALIAS
 291         bool "Update the device-tree stdout alias from U-Boot"
 292         depends on OF_LIBFDT
 293         help
 294           This uses U-Boot's serial alias from the aliases node to update
 295           the device tree passed to the OS. The "linux,stdout-path" property
 296           in the chosen node is set to point to the correct serial node.
 297           This option currently references CONFIG_CONS_INDEX, which is
 298           incorrect when used with device tree as this option does not
 299           exist / should not be used.
 300
 301 config SYS_EXTRA_OPTIONS
 302         string "Extra Options (DEPRECATED)"
 303         help
 304           The old configuration infrastructure (= mkconfig + boards.cfg)
 305           provided the extra options field. If you have something like
 306           "HAS_BAR,BAZ=64", the optional options
 307             #define CONFIG_HAS
 308             #define CONFIG_BAZ  64
 309           will be defined in include/config.h.
 310           This option was prepared for the smooth migration from the old
 311           configuration to Kconfig. Since this option will be removed sometime,
 312           new boards should not use this option.
 313
 314 config SYS_TEXT_BASE
 315         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 316                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
 317         depends on !EFI_APP
 318         hex "Text Base"
 319         help
 320           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 321
 322 config SPL_LOAD_FIT
 323         bool "Enable SPL loading U-Boot as a FIT"
 324         depends on FIT
 325         help
 326           Normally with the SPL framework a legacy image is generated as part
 327           of the build. This contains U-Boot along with information as to
 328           where it should be loaded. This option instead enables generation
 329           of a FIT (Flat Image Tree) which provides more flexibility. In
 330           particular it can handle selecting from multiple device tree
 331           and passing the correct one to U-Boot.
 332
 333 config SPL_FIT_IMAGE_POST_PROCESS
 334         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 335         depends on SPL_LOAD_FIT && TI_SECURE_DEVICE
 336         help
 337           Allows doing any sort of manipulation to blobs after they got extracted
 338           from the U-Boot FIT image like stripping off headers or modifying the
 339           size of the blob, verification, authentication, decryption etc. in a
 340           platform or board specific way. In order to use this feature a platform
 341           or board-specific implementation of board_fit_image_post_process() must
 342           be provided. Also, anything done during this post-processing step would
 343           need to be comprehended in how the images were prepared before being
 344           injected into the FIT creation (i.e. the blobs would have been pre-
 345           processed before being added to the FIT image).
 346
 347 config FIT_IMAGE_POST_PROCESS
 348         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 349         depends on FIT && TI_SECURE_DEVICE
 350         help
 351           Allows doing any sort of manipulation to blobs after they got extracted
 352           from FIT images like stripping off headers or modifying the size of the
 353           blob, verification, authentication, decryption etc. in a platform or
 354           board specific way. In order to use this feature a platform or board-
 355           specific implementation of board_fit_image_post_process() must be
 356           provided. Also, anything done during this post-processing step would
 357           need to be comprehended in how the images were prepared before being
 358           injected into the FIT creation (i.e. the blobs would have been pre-
 359           processed before being added to the FIT image).
 360
 361 config SYS_CLK_FREQ
 362         depends on ARC || ARCH_SUNXI
 363         int "CPU clock frequency"
 364         help
 365           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 366
 367 config ARCH_FIXUP_FDT
 368         bool "Enable arch_fixup_fdt() call"
 369         depends on ARM || MIPS
 370         default y
 371         help
 372           Enable FDT memory map syncup before OS boot. This feature can be
 373           used for booting OS with different memory setup where the part of
 374           the memory location should be used for different purpose.
 375
 376 endmenu         # Boot images
 377
 378 source "common/Kconfig"
 379
 380 source "cmd/Kconfig"
 381
 382 source "dts/Kconfig"
 383
 384 source "net/Kconfig"
 385
 386 source "drivers/Kconfig"
 387
 388 source "fs/Kconfig"
 389
 390 source "lib/Kconfig"
 391
 392 source "test/Kconfig"