Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5 mainmenu "U-Boot $UBOOTVERSION Configuration"
   6
   7 config UBOOTVERSION
   8         string
   9         option env="UBOOTVERSION"
  10
  11 # Allow defaults in arch-specific code to override any given here
  12 source "arch/Kconfig"
  13
  14 menu "General setup"
  15
  16 config LOCALVERSION
  17         string "Local version - append to U-Boot release"
  18         help
  19           Append an extra string to the end of your U-Boot version.
  20           This will show up on your boot log, for example.
  21           The string you set here will be appended after the contents of
  22           any files with a filename matching localversion* in your
  23           object and source tree, in that order.  Your total string can
  24           be a maximum of 64 characters.
  25
  26 config LOCALVERSION_AUTO
  27         bool "Automatically append version information to the version string"
  28         default y
  29         help
  30           This will try to automatically determine if the current tree is a
  31           release tree by looking for git tags that belong to the current
  32           top of tree revision.
  33
  34           A string of the format -gxxxxxxxx will be added to the localversion
  35           if a git-based tree is found.  The string generated by this will be
  36           appended after any matching localversion* files, and after the value
  37           set in CONFIG_LOCALVERSION.
  38
  39           (The actual string used here is the first eight characters produced
  40           by running the command:
  41
  42             $ git rev-parse --verify HEAD
  43
  44           which is done within the script "scripts/setlocalversion".)
  45
  46 config CC_OPTIMIZE_FOR_SIZE
  47         bool "Optimize for size"
  48         default y
  49         help
  50           Enabling this option will pass "-Os" instead of "-O2" to gcc
  51           resulting in a smaller U-Boot image.
  52
  53           This option is enabled by default for U-Boot.
  54
  55 config SYS_MALLOC_F
  56         bool "Enable malloc() pool before relocation"
  57         default y if DM
  58         help
  59           Before relocation memory is very limited on many platforms. Still,
  60           we can provide a small malloc() pool if needed. Driver model in
  61           particular needs this to operate, so that it can allocate the
  62           initial serial device and any others that are needed.
  63
  64 config SYS_MALLOC_F_LEN
  65         hex "Size of malloc() pool before relocation"
  66         depends on SYS_MALLOC_F
  67         default 0x400
  68         help
  69           Before relocation memory is very limited on many platforms. Still,
  70           we can provide a small malloc() pool if needed. Driver model in
  71           particular needs this to operate, so that it can allocate the
  72           initial serial device and any others that are needed.
  73
  74 menuconfig EXPERT
  75         bool "Configure standard U-Boot features (expert users)"
  76         default y
  77         help
  78           This option allows certain base U-Boot options and settings
  79           to be disabled or tweaked. This is for specialized
  80           environments which can tolerate a "non-standard" U-Boot.
  81           Only use this if you really know what you are doing.
  82
  83 if EXPERT
  84         config SYS_MALLOC_CLEAR_ON_INIT
  85         bool "Init with zeros the memory reserved for malloc (slow)"
  86         default y
  87         help
  88           This setting is enabled by default. The reserved malloc
  89           memory is initialized with zeros, so first malloc calls
  90           will return the pointer to the zeroed memory. But this
  91           slows the boot time.
  92
  93           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
  94           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
  95           Then the boot time can be significantly reduced.
  96           Warning:
  97           When disabling this, please check if malloc calls, maybe
  98           should be replaced by calloc - if expects zeroed memory.
  99 endif
 100 endmenu         # General setup
 101
 102 menu "Boot images"
 103
 104 config SUPPORT_SPL
 105         bool
 106
 107 config SUPPORT_TPL
 108         bool
 109
 110 config SPL
 111         bool
 112         depends on SUPPORT_SPL
 113         prompt "Enable SPL"
 114         help
 115           If you want to build SPL as well as the normal image, say Y.
 116
 117 config SPL_SYS_MALLOC_SIMPLE
 118         bool
 119         depends on SPL
 120         prompt "Only use malloc_simple functions in the spl"
 121         help
 122           Say Y here to only use the *_simple malloc functions from
 123           malloc_simple.c, rather then using the versions from dlmalloc.c
 124           this will make the SPL binary smaller at the cost of more heap
 125           usage as the *_simple malloc functions do not re-use free-ed mem.
 126
 127 config SPL_STACK_R
 128         depends on SPL
 129         bool "Enable SDRAM location for SPL stack"
 130         help
 131           SPL starts off execution in SRAM and thus typically has only a small
 132           stack available. Since SPL sets up DRAM while in its board_init_f()
 133           function, it is possible for the stack to move there before
 134           board_init_r() is reached. This option enables a special SDRAM
 135           location for the SPL stack. U-Boot SPL switches to this after
 136           board_init_f() completes, and before board_init_r() starts.
 137
 138 config SPL_STACK_R_ADDR
 139         depends on SPL_STACK_R
 140         hex "SDRAM location for SPL stack"
 141         help
 142           Specify the address in SDRAM for the SPL stack. This will be set up
 143           before board_init_r() is called.
 144
 145 config SPL_STACK_R_MALLOC_SIMPLE_LEN
 146         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
 147         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
 148         default 0x100000
 149         help
 150           Specify the amount of the stack to use as memory pool for
 151           malloc_simple after switching the stack to DRAM. This may be set
 152           to give board_init_r() a larger heap then the initial heap in
 153           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
 154
 155 config SPL_SEPARATE_BSS
 156         depends on SPL
 157         bool "BSS section is in a different memory region from text"
 158         help
 159           Some platforms need a large BSS region in SPL and can provide this
 160           because RAM is already set up. In this case BSS can be moved to RAM.
 161           This option should then be enabled so that the correct device tree
 162           location is used. Normally we put the device tree at the end of BSS
 163           but with this option enabled, it goes at _image_binary_end.
 164
 165 config TPL
 166         bool
 167         depends on SPL && SUPPORT_TPL
 168         prompt "Enable TPL"
 169         help
 170           If you want to build TPL as well as the normal image and SPL, say Y.
 171
 172 config FIT
 173         bool "Support Flattened Image Tree"
 174         help
 175           This option allows to boot the new uImage structrure,
 176           Flattened Image Tree.  FIT is formally a FDT, which can include
 177           images of various types (kernel, FDT blob, ramdisk, etc.)
 178           in a single blob.  To boot this new uImage structure,
 179           pass the address of the blob to the "bootm" command.
 180           FIT is very flexible, supporting compression, multiple images,
 181           multiple configurations, verification through hashing and also
 182           verified boot (secure boot using RSA). This option enables that
 183           feature.
 184
 185 config FIT_VERBOSE
 186         bool "Display verbose messages on FIT boot"
 187         depends on FIT
 188
 189 config FIT_SIGNATURE
 190         bool "Enable signature verification of FIT uImages"
 191         depends on FIT
 192         depends on DM
 193         select RSA
 194         help
 195           This option enables signature verification of FIT uImages,
 196           using a hash signed and verified using RSA. If
 197           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 198           hashing is available using hardware, then then RSA library will use
 199           it. See doc/uImage.FIT/signature.txt for more details.
 200
 201           WARNING: When relying on signed FIT images with a required signature
 202           check the legacy image format is disabled by default, so that
 203           unsigned images cannot be loaded. If a board needs the legacy image
 204           format support in this case, enable it using
 205           CONFIG_IMAGE_FORMAT_LEGACY.
 206
 207 config FIT_BEST_MATCH
 208         bool "Select the best match for the kernel device tree"
 209         depends on FIT
 210         help
 211           When no configuration is explicitly selected, default to the
 212           one whose fdt's compatibility field best matches that of
 213           U-Boot itself. A match is considered "best" if it matches the
 214           most specific compatibility entry of U-Boot's fdt's root node.
 215           The order of entries in the configuration's fdt is ignored.
 216
 217 config FIT_VERBOSE
 218         bool "Show verbose messages when FIT images fails"
 219         depends on FIT
 220         help
 221           Generally a system will have valid FIT images so debug messages
 222           are a waste of code space. If you are debugging your images then
 223           you can enable this option to get more verbose information about
 224           failures.
 225
 226 config OF_BOARD_SETUP
 227         bool "Set up board-specific details in device tree before boot"
 228         depends on OF_LIBFDT
 229         help
 230           This causes U-Boot to call ft_board_setup() before booting into
 231           the Operating System. This function can set up various
 232           board-specific information in the device tree for use by the OS.
 233           The device tree is then passed to the OS.
 234
 235 config OF_SYSTEM_SETUP
 236         bool "Set up system-specific details in device tree before boot"
 237         depends on OF_LIBFDT
 238         help
 239           This causes U-Boot to call ft_system_setup() before booting into
 240           the Operating System. This function can set up various
 241           system-specific information in the device tree for use by the OS.
 242           The device tree is then passed to the OS.
 243
 244 config OF_STDOUT_VIA_ALIAS
 245         bool "Update the device-tree stdout alias from U-Boot"
 246         depends on OF_LIBFDT
 247         help
 248           This uses U-Boot's serial alias from the aliases node to update
 249           the device tree passed to the OS. The "linux,stdout-path" property
 250           in the chosen node is set to point to the correct serial node.
 251           This option currently references CONFIG_CONS_INDEX, which is
 252           incorrect when used with device tree as this option does not
 253           exist / should not be used.
 254
 255 config SYS_EXTRA_OPTIONS
 256         string "Extra Options (DEPRECATED)"
 257         help
 258           The old configuration infrastructure (= mkconfig + boards.cfg)
 259           provided the extra options field. If you have something like
 260           "HAS_BAR,BAZ=64", the optional options
 261             #define CONFIG_HAS
 262             #define CONFIG_BAZ  64
 263           will be defined in include/config.h.
 264           This option was prepared for the smooth migration from the old
 265           configuration to Kconfig. Since this option will be removed sometime,
 266           new boards should not use this option.
 267
 268 config SYS_TEXT_BASE
 269         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 270                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE
 271         depends on !EFI_APP
 272         hex "Text Base"
 273         help
 274           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 275
 276 config SPL_LOAD_FIT
 277         bool "Enable SPL loading U-Boot as a FIT"
 278         depends on FIT
 279         help
 280           Normally with the SPL framework a legacy image is generated as part
 281           of the build. This contains U-Boot along with information as to
 282           where it should be loaded. This option instead enables generation
 283           of a FIT (Flat Image Tree) which provides more flexibility. In
 284           particular it can handle selecting from multiple device tree
 285           and passing the correct one to U-Boot.
 286
 287 config SYS_CLK_FREQ
 288         depends on ARC || ARCH_SUNXI
 289         int "CPU clock frequency"
 290         help
 291           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 292
 293 endmenu         # Boot images
 294
 295 source "common/Kconfig"
 296
 297 source "cmd/Kconfig"
 298
 299 source "dts/Kconfig"
 300
 301 source "net/Kconfig"
 302
 303 source "drivers/Kconfig"
 304
 305 source "fs/Kconfig"
 306
 307 source "lib/Kconfig"
 308
 309 source "test/Kconfig"