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 comment "Compiler: $(CC_VERSION_TEXT)"
   9
  10 source "scripts/Kconfig.include"
  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 DEPRECATED
  24         bool
  25         help
  26           This option cannot be enabled.  It it used as a dependency for
  27           code that relies on deprecated features that will be removed and
  28           the conversion deadline has passed.
  29
  30 config LOCALVERSION
  31         string "Local version - append to U-Boot release"
  32         help
  33           Append an extra string to the end of your U-Boot version.
  34           This will show up in your boot log, for example.
  35           The string you set here will be appended after the contents of
  36           any files with a filename matching localversion* in your
  37           object and source tree, in that order.  Your total string can
  38           be a maximum of 64 characters.
  39
  40 config LOCALVERSION_AUTO
  41         bool "Automatically append version information to the version string"
  42         default y
  43         help
  44           This will try to automatically determine if the current tree is a
  45           release tree by looking for Git tags that belong to the current
  46           top of tree revision.
  47
  48           A string of the format -gxxxxxxxx will be added to the localversion
  49           if a Git-based tree is found.  The string generated by this will be
  50           appended after any matching localversion* files, and after the value
  51           set in CONFIG_LOCALVERSION.
  52
  53           (The actual string used here is the first eight characters produced
  54           by running the command:
  55
  56             $ git rev-parse --verify HEAD
  57
  58           which is done within the script "scripts/setlocalversion".)
  59
  60 config CC_OPTIMIZE_FOR_SIZE
  61         bool "Optimize for size"
  62         default y
  63         help
  64           Enabling this option will pass "-Os" instead of "-O2" to gcc
  65           resulting in a smaller U-Boot image.
  66
  67           This option is enabled by default for U-Boot.
  68
  69 config OPTIMIZE_INLINING
  70         bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
  71         default n
  72         help
  73           This option determines if U-Boot forces gcc to inline the functions
  74           developers have marked 'inline'. Doing so takes away freedom from gcc to
  75           do what it thinks is best, which is desirable in some cases for size
  76           reasons.
  77
  78 config SPL_OPTIMIZE_INLINING
  79         bool "Allow compiler to uninline functions marked 'inline' in SPL"
  80         depends on SPL
  81         default n
  82         help
  83           This option determines if U-Boot forces gcc to inline the functions
  84           developers have marked 'inline'. Doing so takes away freedom from gcc to
  85           do what it thinks is best, which is desirable in some cases for size
  86           reasons.
  87
  88 config TPL_OPTIMIZE_INLINING
  89         bool "Allow compiler to uninline functions marked 'inline' in TPL"
  90         depends on TPL
  91         default n
  92         help
  93           This option determines if U-Boot forces gcc to inline the functions
  94           developers have marked 'inline'. Doing so takes away freedom from gcc to
  95           do what it thinks is best, which is desirable in some cases for size
  96           reasons.
  97
  98 config CC_COVERAGE
  99         bool "Enable code coverage analysis"
 100         depends on SANDBOX
 101         help
 102           Enabling this option will pass "--coverage" to gcc to compile
 103           and link code instrumented for coverage analysis.
 104
 105 config CC_HAS_ASM_INLINE
 106         def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 107
 108 config XEN
 109         bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
 110         help
 111           Enabling this option will make U-Boot be run as a bootloader
 112           for XEN [1] Virtual Machine.
 113
 114           Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
 115           for para-virtualization. Xen can organize the safe execution of several
 116           virtual machines on the same physical system with performance close to
 117           native. It is used as the basis for a number of different commercial and
 118           open source applications, such as: server virtualization, Infrastructure
 119           as a Service (IaaS), desktop virtualization, security applications,
 120           embedded and hardware appliances.
 121           Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
 122           Xen to use the device drivers for the Domain-0 kernel by default.
 123
 124           [1] - https://xenproject.org/
 125
 126 config DISTRO_DEFAULTS
 127         bool "Select defaults suitable for booting general purpose Linux distributions"
 128         select AUTO_COMPLETE
 129         select CMDLINE_EDITING
 130         select CMD_BOOTI if ARM64
 131         select CMD_BOOTZ if ARM && !ARM64
 132         select CMD_DHCP if CMD_NET
 133         select CMD_ENV_EXISTS
 134         select CMD_EXT2
 135         select CMD_EXT4
 136         select CMD_FAT
 137         select CMD_FS_GENERIC
 138         select CMD_PART if PARTITIONS
 139         select CMD_PING if CMD_NET
 140         select CMD_PXE if NET
 141         select CMD_SYSBOOT
 142         select ENV_VARS_UBOOT_CONFIG
 143         select HUSH_PARSER
 144         select SUPPORT_RAW_INITRD
 145         select SYS_LONGHELP
 146         imply CMD_MII if NET
 147         imply USB_STORAGE
 148         imply USE_BOOTCOMMAND
 149         help
 150           Select this to enable various options and commands which are suitable
 151           for building u-boot for booting general purpose Linux distributions.
 152
 153 config ENV_VARS_UBOOT_CONFIG
 154         bool "Add arch, board, vendor and soc variables to default environment"
 155         help
 156           Define this in order to add variables describing the
 157           U-Boot build configuration to the default environment.
 158           These will be named arch, cpu, board, vendor, and soc.
 159           Enabling this option will cause the following to be defined:
 160           - CONFIG_SYS_ARCH
 161           - CONFIG_SYS_CPU
 162           - CONFIG_SYS_BOARD
 163           - CONFIG_SYS_VENDOR
 164           - CONFIG_SYS_SOC
 165
 166 config NR_DRAM_BANKS
 167         int "Number of DRAM banks"
 168         default 1 if ARCH_SUNXI || ARCH_OWL
 169         default 4
 170         help
 171           This defines the number of DRAM banks.
 172
 173 config SYS_BOOT_GET_CMDLINE
 174         bool "Enable kernel command line setup"
 175         help
 176           Enables allocating and saving kernel cmdline in space between
 177           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 178
 179 config SYS_BOOT_GET_KBD
 180         bool "Enable kernel board information setup"
 181         help
 182           Enables allocating and saving a kernel copy of the bd_info in
 183           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 184
 185 config SYS_MALLOC_F
 186         bool "Enable malloc() pool before relocation"
 187         default y if DM
 188
 189         help
 190           Before relocation, memory is very limited on many platforms. Still,
 191           we can provide a small malloc() pool if needed. Driver model in
 192           particular needs this to operate, so that it can allocate the
 193           initial serial device and any others that are needed.
 194
 195 config SYS_MALLOC_F_LEN
 196         hex "Size of malloc() pool before relocation"
 197         depends on SYS_MALLOC_F
 198         default 0x1000 if AM33XX
 199         default 0x4000 if SANDBOX
 200         default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
 201                            ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
 202                            ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
 203                            ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
 204         default 0x400
 205         help
 206           Before relocation, memory is very limited on many platforms. Still,
 207           we can provide a small malloc() pool if needed. Driver model in
 208           particular needs this to operate, so that it can allocate the
 209           initial serial device and any others that are needed.
 210
 211 config SYS_MALLOC_LEN
 212         hex "Define memory for Dynamic allocation"
 213         depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
 214         default 0x2000000 if ARCH_ROCKCHIP
 215         help
 216           This defines memory to be allocated for Dynamic allocation
 217           TODO: Use for other architectures
 218
 219 config SPL_SYS_MALLOC_F_LEN
 220         hex "Size of malloc() pool in SPL"
 221         depends on SYS_MALLOC_F && SPL
 222         default 0x2800 if RCAR_GEN3
 223         default SYS_MALLOC_F_LEN
 224         help
 225           In SPL memory is very limited on many platforms. Still,
 226           we can provide a small malloc() pool if needed. Driver model in
 227           particular needs this to operate, so that it can allocate the
 228           initial serial device and any others that are needed.
 229
 230           It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
 231           malloc() region in SDRAM once it is inited.
 232
 233 config TPL_SYS_MALLOC_F_LEN
 234         hex "Size of malloc() pool in TPL"
 235         depends on SYS_MALLOC_F && TPL
 236         default SPL_SYS_MALLOC_F_LEN
 237         help
 238           In TPL memory is very limited on many platforms. Still,
 239           we can provide a small malloc() pool if needed. Driver model in
 240           particular needs this to operate, so that it can allocate the
 241           initial serial device and any others that are needed.
 242
 243 menuconfig EXPERT
 244         bool "Configure standard U-Boot features (expert users)"
 245         default y
 246         help
 247           This option allows certain base U-Boot options and settings
 248           to be disabled or tweaked. This is for specialized
 249           environments which can tolerate a "non-standard" U-Boot.
 250           Use this only if you really know what you are doing.
 251
 252 if EXPERT
 253         config SYS_MALLOC_CLEAR_ON_INIT
 254         bool "Init with zeros the memory reserved for malloc (slow)"
 255         default y
 256         help
 257           This setting is enabled by default. The reserved malloc
 258           memory is initialized with zeros, so first malloc calls
 259           will return the pointer to the zeroed memory. But this
 260           slows the boot time.
 261
 262           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 263           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 264           Then the boot time can be significantly reduced.
 265           Warning:
 266           When disabling this, please check if malloc calls, maybe
 267           should be replaced by calloc - if one expects zeroed memory.
 268
 269 config SYS_MALLOC_DEFAULT_TO_INIT
 270         bool "Default malloc to init while reserving the memory for it"
 271         default n
 272         help
 273           It may happen that one needs to move the dynamic allocation
 274           from one to another memory range, eg. when moving the malloc
 275           from the limited static to a potentially large dynamic (DDR)
 276           memory.
 277
 278           If so then on top of setting the updated memory aside one
 279           needs to bring the malloc init.
 280
 281           If such a scenario is sought choose yes.
 282
 283 config TOOLS_DEBUG
 284         bool "Enable debug information for tools"
 285         help
 286           Enable generation of debug information for tools such as mkimage.
 287           This can be used for debugging purposes. With debug information
 288           it is possible to set breakpoints on particular lines, single-step
 289           debug through the source code, etc.
 290
 291 endif # EXPERT
 292
 293 config PHYS_64BIT
 294         bool "64bit physical address support"
 295         help
 296           Say Y here to support 64bit physical memory address.
 297           This can be used not only for 64bit SoCs, but also for
 298           large physical address extension on 32bit SoCs.
 299
 300 config HAS_ROM
 301         bool
 302         select BINMAN
 303         help
 304           Enables building of a u-boot.rom target. This collects U-Boot and
 305           any necessary binary blobs.
 306
 307 config ROM_NEEDS_BLOBS
 308         bool
 309         depends on HAS_ROM
 310         help
 311           Enable this if building the u-boot.rom target needs binary blobs, and
 312           so cannot be done normally. In this case, U-Boot will only build the
 313           ROM if the required blobs exist. If not, you will see an warning like:
 314
 315             Image 'main-section' is missing external blobs and is non-functional:
 316               intel-descriptor intel-me intel-refcode intel-vga intel-mrc
 317
 318 config BUILD_ROM
 319         bool "Build U-Boot as BIOS replacement"
 320         depends on HAS_ROM
 321         default y if !ROM_NEEDS_BLOBS
 322         help
 323           This option allows to build a ROM version of U-Boot.
 324           The build process generally requires several binary blobs
 325           which are not shipped in the U-Boot source tree.
 326           Please, see doc/arch/x86.rst for details.
 327
 328 config SPL_IMAGE
 329         string "SPL image used in the combined SPL+U-Boot image"
 330         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 331         default "spl/u-boot-spl.bin"
 332         depends on SPL
 333         help
 334           Select the SPL build target that shall be generated by the SPL
 335           build process (default spl/u-boot-spl.bin). This image will be
 336           used to generate a combined image with SPL and main U-Boot
 337           proper as one single image.
 338
 339 config BUILD_TARGET
 340         string "Build target special images"
 341         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 342         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 343         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 344         default "u-boot-elf.srec" if RCAR_GEN3
 345         default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
 346                                 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
 347         default "u-boot.kwb" if ARCH_KIRKWOOD
 348         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 349         default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
 350         help
 351           Some SoCs need special image types (e.g. U-Boot binary
 352           with a special header) as build targets. By defining
 353           CONFIG_BUILD_TARGET in the SoC / board header, this
 354           special image will be automatically built upon calling
 355           make / buildman.
 356
 357 config SYS_CUSTOM_LDSCRIPT
 358         bool "Use a custom location for the U-Boot linker script"
 359         help
 360           Normally when linking U-Boot we will look in the board directory,
 361           the CPU directory and finally the "cpu" directory of the architecture
 362           for the ile "u-boot.lds" and use that as our linker.  However, in
 363           some cases we need to provide a different linker script.  To do so,
 364           enable this option and then provide the location under
 365           CONFIG_SYS_LDSCRIPT.
 366
 367 config SYS_LDSCRIPT
 368         depends on SYS_CUSTOM_LDSCRIPT
 369         string "Custom ldscript location"
 370         help
 371           Path within the source tree to the linker script to use for the
 372           main U-Boot binary.
 373
 374 config ERR_PTR_OFFSET
 375         hex
 376         default 0x0
 377         help
 378           Some U-Boot pointers have redundant information, so we can use a
 379           scheme where we can return either an error code or a pointer with the
 380           same return value. The default implementation just casts the pointer
 381           to a number, however, this may fail on platforms where the end of the
 382           address range is used for valid pointers (e.g. 0xffffff00 is a valid
 383           heap pointer in socfpga SPL).
 384           For such platforms, this value provides an upper range of those error
 385           pointer values - up to 'MAX_ERRNO' bytes below this value must be
 386           unused/invalid addresses.
 387
 388 config PLATFORM_ELFENTRY
 389         string
 390         default "__start" if MIPS
 391         default "_start"
 392
 393 config STACK_SIZE
 394         hex "Define max stack size that can be used by U-Boot"
 395         default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
 396         default 0x200000 if MICROBLAZE
 397         default 0x1000000
 398         help
 399           Define Max stack size that can be used by U-Boot. This value is used
 400           by the UEFI sub-system. On some boards initrd_high is calculated as
 401           base stack pointer minus this stack size.
 402
 403 config SYS_HAS_SRAM
 404         bool
 405         default y if TARGET_PIC32MZDASK
 406         default y if TARGET_DEVKIT8000
 407         default y if TARGET_TRICORDER
 408         default n
 409         help
 410           Enable this to allow support for the on board SRAM.
 411           SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
 412           SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
 413
 414 config SYS_SRAM_BASE
 415         hex
 416         default 0x80000000 if TARGET_PIC32MZDASK
 417         default 0x40200000 if TARGET_DEVKIT8000
 418         default 0x40200000 if TARGET_TRICORDER
 419         default 0x0
 420
 421 config SYS_SRAM_SIZE
 422         hex
 423         default 0x00080000 if TARGET_PIC32MZDASK
 424         default 0x10000 if TARGET_DEVKIT8000
 425         default 0x10000 if TARGET_TRICORDER
 426         default 0x0
 427
 428 config EXAMPLES
 429         bool "Compile API examples"
 430         depends on !SANDBOX
 431         default y if ARCH_QEMU
 432         help
 433           U-Boot provides an API for standalone applications. Examples are
 434           provided in directory examples/.
 435
 436 endmenu         # General setup
 437
 438 source "api/Kconfig"
 439
 440 source "common/Kconfig"
 441
 442 source "cmd/Kconfig"
 443
 444 source "disk/Kconfig"
 445
 446 source "dts/Kconfig"
 447
 448 source "env/Kconfig"
 449
 450 source "net/Kconfig"
 451
 452 source "drivers/Kconfig"
 453
 454 source "fs/Kconfig"
 455
 456 source "lib/Kconfig"
 457
 458 source "test/Kconfig"
 459
 460 source "tools/Kconfig"