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 if ARM && !ARM64
  61         select CMD_BOOTI if ARM64
  62         select CMD_DHCP
  63         select CMD_EXT2
  64         select CMD_EXT4
  65         select CMD_FAT
  66         select CMD_FS_GENERIC
  67         select CMD_MII
  68         select CMD_PING
  69         select HUSH_PARSER
  70         help
  71           Select this to enable various options and commands which are suitable
  72           for building u-boot for booting general purpose Linux distributions.
  73
  74 config SYS_MALLOC_F
  75         bool "Enable malloc() pool before relocation"
  76         default y if DM
  77         help
  78           Before relocation, memory is very limited on many platforms. Still,
  79           we can provide a small malloc() pool if needed. Driver model in
  80           particular needs this to operate, so that it can allocate the
  81           initial serial device and any others that are needed.
  82
  83 config SYS_MALLOC_F_LEN
  84         hex "Size of malloc() pool before relocation"
  85         depends on SYS_MALLOC_F
  86         default 0x2000 if SPL_DM && SPL_OF_CONTROL
  87         default 0x400
  88         help
  89           Before relocation, memory is very limited on many platforms. Still,
  90           we can provide a small malloc() pool if needed. Driver model in
  91           particular needs this to operate, so that it can allocate the
  92           initial serial device and any others that are needed.
  93
  94 menuconfig EXPERT
  95         bool "Configure standard U-Boot features (expert users)"
  96         default y
  97         help
  98           This option allows certain base U-Boot options and settings
  99           to be disabled or tweaked. This is for specialized
 100           environments which can tolerate a "non-standard" U-Boot.
 101           Use this only if you really know what you are doing.
 102
 103 if EXPERT
 104         config SYS_MALLOC_CLEAR_ON_INIT
 105         bool "Init with zeros the memory reserved for malloc (slow)"
 106         default y
 107         help
 108           This setting is enabled by default. The reserved malloc
 109           memory is initialized with zeros, so first malloc calls
 110           will return the pointer to the zeroed memory. But this
 111           slows the boot time.
 112
 113           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 114           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 115           Then the boot time can be significantly reduced.
 116           Warning:
 117           When disabling this, please check if malloc calls, maybe
 118           should be replaced by calloc - if one expects zeroed memory.
 119
 120 config TOOLS_DEBUG
 121         bool "Enable debug information for tools"
 122         help
 123           Enable generation of debug information for tools such as mkimage.
 124           This can be used for debugging purposes. With debug information
 125           it is possible to set breakpoints on particular lines, single-step
 126           debug through the source code, etc.
 127
 128 endif
 129
 130 config PHYS_64BIT
 131         bool "64bit physical address support"
 132         help
 133           Say Y here to support 64bit physical memory address.
 134           This can be used not only for 64bit SoCs, but also for
 135           large physical address extention on 32bit SoCs.
 136
 137 endmenu         # General setup
 138
 139 menu "Boot images"
 140
 141 config SUPPORT_SPL
 142         bool
 143
 144 config SUPPORT_TPL
 145         bool
 146
 147 config SPL
 148         bool
 149         depends on SUPPORT_SPL
 150         prompt "Enable SPL"
 151         help
 152           If you want to build SPL as well as the normal image, say Y.
 153
 154 config SPL_SYS_MALLOC_SIMPLE
 155         bool
 156         depends on SPL
 157         prompt "Only use malloc_simple functions in the SPL"
 158         help
 159           Say Y here to only use the *_simple malloc functions from
 160           malloc_simple.c, rather then using the versions from dlmalloc.c;
 161           this will make the SPL binary smaller at the cost of more heap
 162           usage as the *_simple malloc functions do not re-use free-ed mem.
 163
 164 config SPL_STACK_R
 165         depends on SPL
 166         bool "Enable SDRAM location for SPL stack"
 167         help
 168           SPL starts off execution in SRAM and thus typically has only a small
 169           stack available. Since SPL sets up DRAM while in its board_init_f()
 170           function, it is possible for the stack to move there before
 171           board_init_r() is reached. This option enables a special SDRAM
 172           location for the SPL stack. U-Boot SPL switches to this after
 173           board_init_f() completes, and before board_init_r() starts.
 174
 175 config SPL_STACK_R_ADDR
 176         depends on SPL_STACK_R
 177         hex "SDRAM location for SPL stack"
 178         help
 179           Specify the address in SDRAM for the SPL stack. This will be set up
 180           before board_init_r() is called.
 181
 182 config SPL_STACK_R_MALLOC_SIMPLE_LEN
 183         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
 184         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
 185         default 0x100000
 186         help
 187           Specify the amount of the stack to use as memory pool for
 188           malloc_simple after switching the stack to DRAM. This may be set
 189           to give board_init_r() a larger heap then the initial heap in
 190           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
 191
 192 config SPL_SEPARATE_BSS
 193         depends on SPL
 194         bool "BSS section is in a different memory region from text"
 195         help
 196           Some platforms need a large BSS region in SPL and can provide this
 197           because RAM is already set up. In this case BSS can be moved to RAM.
 198           This option should then be enabled so that the correct device tree
 199           location is used. Normally we put the device tree at the end of BSS
 200           but with this option enabled, it goes at _image_binary_end.
 201
 202 config TPL
 203         bool
 204         depends on SPL && SUPPORT_TPL
 205         prompt "Enable TPL"
 206         help
 207           If you want to build TPL as well as the normal image and SPL, say Y.
 208
 209 config FIT
 210         bool "Support Flattened Image Tree"
 211         help
 212           This option allows to boot the new uImage structrure,
 213           Flattened Image Tree.  FIT is formally a FDT, which can include
 214           images of various types (kernel, FDT blob, ramdisk, etc.)
 215           in a single blob.  To boot this new uImage structure,
 216           pass the address of the blob to the "bootm" command.
 217           FIT is very flexible, supporting compression, multiple images,
 218           multiple configurations, verification through hashing and also
 219           verified boot (secure boot using RSA). This option enables that
 220           feature.
 221
 222 config SPL_FIT
 223         bool "Support Flattened Image Tree within SPL"
 224         depends on FIT
 225         depends on SPL
 226
 227 config FIT_VERBOSE
 228         bool "Display verbose messages on FIT boot"
 229         depends on FIT
 230
 231 config FIT_SIGNATURE
 232         bool "Enable signature verification of FIT uImages"
 233         depends on FIT
 234         depends on DM
 235         select RSA
 236         help
 237           This option enables signature verification of FIT uImages,
 238           using a hash signed and verified using RSA. If
 239           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 240           hashing is available using hardware, then then RSA library will use
 241           it. See doc/uImage.FIT/signature.txt for more details.
 242
 243           WARNING: When relying on signed FIT images with a required signature
 244           check the legacy image format is disabled by default, so that
 245           unsigned images cannot be loaded. If a board needs the legacy image
 246           format support in this case, enable it using
 247           CONFIG_IMAGE_FORMAT_LEGACY.
 248
 249 config SPL_FIT_SIGNATURE
 250         bool "Enable signature verification of FIT firmware within SPL"
 251         depends on SPL_FIT
 252         depends on SPL_DM
 253         select SPL_RSA
 254
 255 config FIT_BEST_MATCH
 256         bool "Select the best match for the kernel device tree"
 257         depends on FIT
 258         help
 259           When no configuration is explicitly selected, default to the
 260           one whose fdt's compatibility field best matches that of
 261           U-Boot itself. A match is considered "best" if it matches the
 262           most specific compatibility entry of U-Boot's fdt's root node.
 263           The order of entries in the configuration's fdt is ignored.
 264
 265 config FIT_VERBOSE
 266         bool "Show verbose messages when FIT images fails"
 267         depends on FIT
 268         help
 269           Generally a system will have valid FIT images so debug messages
 270           are a waste of code space. If you are debugging your images then
 271           you can enable this option to get more verbose information about
 272           failures.
 273
 274 config OF_BOARD_SETUP
 275         bool "Set up board-specific details in device tree before boot"
 276         depends on OF_LIBFDT
 277         help
 278           This causes U-Boot to call ft_board_setup() before booting into
 279           the Operating System. This function can set up various
 280           board-specific information in the device tree for use by the OS.
 281           The device tree is then passed to the OS.
 282
 283 config OF_SYSTEM_SETUP
 284         bool "Set up system-specific details in device tree before boot"
 285         depends on OF_LIBFDT
 286         help
 287           This causes U-Boot to call ft_system_setup() before booting into
 288           the Operating System. This function can set up various
 289           system-specific information in the device tree for use by the OS.
 290           The device tree is then passed to the OS.
 291
 292 config OF_STDOUT_VIA_ALIAS
 293         bool "Update the device-tree stdout alias from U-Boot"
 294         depends on OF_LIBFDT
 295         help
 296           This uses U-Boot's serial alias from the aliases node to update
 297           the device tree passed to the OS. The "linux,stdout-path" property
 298           in the chosen node is set to point to the correct serial node.
 299           This option currently references CONFIG_CONS_INDEX, which is
 300           incorrect when used with device tree as this option does not
 301           exist / should not be used.
 302
 303 config SYS_EXTRA_OPTIONS
 304         string "Extra Options (DEPRECATED)"
 305         help
 306           The old configuration infrastructure (= mkconfig + boards.cfg)
 307           provided the extra options field. If you have something like
 308           "HAS_BAR,BAZ=64", the optional options
 309             #define CONFIG_HAS
 310             #define CONFIG_BAZ  64
 311           will be defined in include/config.h.
 312           This option was prepared for the smooth migration from the old
 313           configuration to Kconfig. Since this option will be removed sometime,
 314           new boards should not use this option.
 315
 316 config SYS_TEXT_BASE
 317         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 318                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
 319         depends on !EFI_APP
 320         hex "Text Base"
 321         help
 322           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 323
 324 config SPL_LOAD_FIT
 325         bool "Enable SPL loading U-Boot as a FIT"
 326         depends on FIT
 327         help
 328           Normally with the SPL framework a legacy image is generated as part
 329           of the build. This contains U-Boot along with information as to
 330           where it should be loaded. This option instead enables generation
 331           of a FIT (Flat Image Tree) which provides more flexibility. In
 332           particular it can handle selecting from multiple device tree
 333           and passing the correct one to U-Boot.
 334
 335 config SPL_FIT_IMAGE_POST_PROCESS
 336         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 337         depends on SPL_LOAD_FIT && TI_SECURE_DEVICE
 338         help
 339           Allows doing any sort of manipulation to blobs after they got extracted
 340           from the U-Boot FIT image like stripping off headers or modifying the
 341           size of the blob, verification, authentication, decryption etc. in a
 342           platform or board specific way. In order to use this feature a platform
 343           or board-specific implementation of board_fit_image_post_process() must
 344           be provided. Also, anything done during this post-processing step would
 345           need to be comprehended in how the images were prepared before being
 346           injected into the FIT creation (i.e. the blobs would have been pre-
 347           processed before being added to the FIT image).
 348
 349 config FIT_IMAGE_POST_PROCESS
 350         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 351         depends on FIT && TI_SECURE_DEVICE
 352         help
 353           Allows doing any sort of manipulation to blobs after they got extracted
 354           from FIT images like stripping off headers or modifying the size of the
 355           blob, verification, authentication, decryption etc. in a platform or
 356           board specific way. In order to use this feature a platform or board-
 357           specific implementation of board_fit_image_post_process() must be
 358           provided. Also, anything done during this post-processing step would
 359           need to be comprehended in how the images were prepared before being
 360           injected into the FIT creation (i.e. the blobs would have been pre-
 361           processed before being added to the FIT image).
 362
 363 config SYS_CLK_FREQ
 364         depends on ARC || ARCH_SUNXI
 365         int "CPU clock frequency"
 366         help
 367           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 368
 369 config ARCH_FIXUP_FDT
 370         bool "Enable arch_fixup_fdt() call"
 371         depends on ARM || MIPS
 372         default y
 373         help
 374           Enable FDT memory map syncup before OS boot. This feature can be
 375           used for booting OS with different memory setup where the part of
 376           the memory location should be used for different purpose.
 377
 378 endmenu         # Boot images
 379
 380 source "common/Kconfig"
 381
 382 source "cmd/Kconfig"
 383
 384 source "dts/Kconfig"
 385
 386 source "net/Kconfig"
 387
 388 source "drivers/Kconfig"
 389
 390 source "fs/Kconfig"
 391
 392 source "lib/Kconfig"
 393
 394 source "test/Kconfig"