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 endif
 118 endmenu         # General setup
 119
 120 menu "Boot images"
 121
 122 config SUPPORT_SPL
 123         bool
 124
 125 config SUPPORT_TPL
 126         bool
 127
 128 config SPL
 129         bool
 130         depends on SUPPORT_SPL
 131         prompt "Enable SPL"
 132         help
 133           If you want to build SPL as well as the normal image, say Y.
 134
 135 config SPL_SYS_MALLOC_SIMPLE
 136         bool
 137         depends on SPL
 138         prompt "Only use malloc_simple functions in the SPL"
 139         help
 140           Say Y here to only use the *_simple malloc functions from
 141           malloc_simple.c, rather then using the versions from dlmalloc.c;
 142           this will make the SPL binary smaller at the cost of more heap
 143           usage as the *_simple malloc functions do not re-use free-ed mem.
 144
 145 config SPL_STACK_R
 146         depends on SPL
 147         bool "Enable SDRAM location for SPL stack"
 148         help
 149           SPL starts off execution in SRAM and thus typically has only a small
 150           stack available. Since SPL sets up DRAM while in its board_init_f()
 151           function, it is possible for the stack to move there before
 152           board_init_r() is reached. This option enables a special SDRAM
 153           location for the SPL stack. U-Boot SPL switches to this after
 154           board_init_f() completes, and before board_init_r() starts.
 155
 156 config SPL_STACK_R_ADDR
 157         depends on SPL_STACK_R
 158         hex "SDRAM location for SPL stack"
 159         help
 160           Specify the address in SDRAM for the SPL stack. This will be set up
 161           before board_init_r() is called.
 162
 163 config SPL_STACK_R_MALLOC_SIMPLE_LEN
 164         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
 165         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
 166         default 0x100000
 167         help
 168           Specify the amount of the stack to use as memory pool for
 169           malloc_simple after switching the stack to DRAM. This may be set
 170           to give board_init_r() a larger heap then the initial heap in
 171           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
 172
 173 config SPL_SEPARATE_BSS
 174         depends on SPL
 175         bool "BSS section is in a different memory region from text"
 176         help
 177           Some platforms need a large BSS region in SPL and can provide this
 178           because RAM is already set up. In this case BSS can be moved to RAM.
 179           This option should then be enabled so that the correct device tree
 180           location is used. Normally we put the device tree at the end of BSS
 181           but with this option enabled, it goes at _image_binary_end.
 182
 183 config TPL
 184         bool
 185         depends on SPL && SUPPORT_TPL
 186         prompt "Enable TPL"
 187         help
 188           If you want to build TPL as well as the normal image and SPL, say Y.
 189
 190 config FIT
 191         bool "Support Flattened Image Tree"
 192         help
 193           This option allows to boot the new uImage structrure,
 194           Flattened Image Tree.  FIT is formally a FDT, which can include
 195           images of various types (kernel, FDT blob, ramdisk, etc.)
 196           in a single blob.  To boot this new uImage structure,
 197           pass the address of the blob to the "bootm" command.
 198           FIT is very flexible, supporting compression, multiple images,
 199           multiple configurations, verification through hashing and also
 200           verified boot (secure boot using RSA). This option enables that
 201           feature.
 202
 203 config SPL_FIT
 204         bool "Support Flattened Image Tree within SPL"
 205         depends on FIT
 206         depends on SPL
 207
 208 config FIT_VERBOSE
 209         bool "Display verbose messages on FIT boot"
 210         depends on FIT
 211
 212 config FIT_SIGNATURE
 213         bool "Enable signature verification of FIT uImages"
 214         depends on FIT
 215         depends on DM
 216         select RSA
 217         help
 218           This option enables signature verification of FIT uImages,
 219           using a hash signed and verified using RSA. If
 220           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 221           hashing is available using hardware, then then RSA library will use
 222           it. See doc/uImage.FIT/signature.txt for more details.
 223
 224           WARNING: When relying on signed FIT images with a required signature
 225           check the legacy image format is disabled by default, so that
 226           unsigned images cannot be loaded. If a board needs the legacy image
 227           format support in this case, enable it using
 228           CONFIG_IMAGE_FORMAT_LEGACY.
 229
 230 config SPL_FIT_SIGNATURE
 231         bool "Enable signature verification of FIT firmware within SPL"
 232         depends on SPL_FIT
 233         depends on SPL_DM
 234         select SPL_RSA
 235
 236 config FIT_BEST_MATCH
 237         bool "Select the best match for the kernel device tree"
 238         depends on FIT
 239         help
 240           When no configuration is explicitly selected, default to the
 241           one whose fdt's compatibility field best matches that of
 242           U-Boot itself. A match is considered "best" if it matches the
 243           most specific compatibility entry of U-Boot's fdt's root node.
 244           The order of entries in the configuration's fdt is ignored.
 245
 246 config FIT_VERBOSE
 247         bool "Show verbose messages when FIT images fails"
 248         depends on FIT
 249         help
 250           Generally a system will have valid FIT images so debug messages
 251           are a waste of code space. If you are debugging your images then
 252           you can enable this option to get more verbose information about
 253           failures.
 254
 255 config OF_BOARD_SETUP
 256         bool "Set up board-specific details in device tree before boot"
 257         depends on OF_LIBFDT
 258         help
 259           This causes U-Boot to call ft_board_setup() before booting into
 260           the Operating System. This function can set up various
 261           board-specific information in the device tree for use by the OS.
 262           The device tree is then passed to the OS.
 263
 264 config OF_SYSTEM_SETUP
 265         bool "Set up system-specific details in device tree before boot"
 266         depends on OF_LIBFDT
 267         help
 268           This causes U-Boot to call ft_system_setup() before booting into
 269           the Operating System. This function can set up various
 270           system-specific information in the device tree for use by the OS.
 271           The device tree is then passed to the OS.
 272
 273 config OF_STDOUT_VIA_ALIAS
 274         bool "Update the device-tree stdout alias from U-Boot"
 275         depends on OF_LIBFDT
 276         help
 277           This uses U-Boot's serial alias from the aliases node to update
 278           the device tree passed to the OS. The "linux,stdout-path" property
 279           in the chosen node is set to point to the correct serial node.
 280           This option currently references CONFIG_CONS_INDEX, which is
 281           incorrect when used with device tree as this option does not
 282           exist / should not be used.
 283
 284 config SYS_EXTRA_OPTIONS
 285         string "Extra Options (DEPRECATED)"
 286         help
 287           The old configuration infrastructure (= mkconfig + boards.cfg)
 288           provided the extra options field. If you have something like
 289           "HAS_BAR,BAZ=64", the optional options
 290             #define CONFIG_HAS
 291             #define CONFIG_BAZ  64
 292           will be defined in include/config.h.
 293           This option was prepared for the smooth migration from the old
 294           configuration to Kconfig. Since this option will be removed sometime,
 295           new boards should not use this option.
 296
 297 config SYS_TEXT_BASE
 298         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 299                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
 300         depends on !EFI_APP
 301         hex "Text Base"
 302         help
 303           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 304
 305 config SPL_LOAD_FIT
 306         bool "Enable SPL loading U-Boot as a FIT"
 307         depends on FIT
 308         help
 309           Normally with the SPL framework a legacy image is generated as part
 310           of the build. This contains U-Boot along with information as to
 311           where it should be loaded. This option instead enables generation
 312           of a FIT (Flat Image Tree) which provides more flexibility. In
 313           particular it can handle selecting from multiple device tree
 314           and passing the correct one to U-Boot.
 315
 316 config SYS_CLK_FREQ
 317         depends on ARC || ARCH_SUNXI
 318         int "CPU clock frequency"
 319         help
 320           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 321
 322 endmenu         # Boot images
 323
 324 source "common/Kconfig"
 325
 326 source "cmd/Kconfig"
 327
 328 source "dts/Kconfig"
 329
 330 source "net/Kconfig"
 331
 332 source "drivers/Kconfig"
 333
 334 source "fs/Kconfig"
 335
 336 source "lib/Kconfig"
 337
 338 source "test/Kconfig"