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_IS_GCC
  61         def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
  62
  63 config GCC_VERSION
  64         int
  65         default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
  66         default 0
  67
  68 config CC_IS_CLANG
  69         def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
  70
  71 config CLANG_VERSION
  72         int
  73         default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
  74
  75 choice
  76         prompt "Optimization level"
  77         default CC_OPTIMIZE_FOR_SIZE
  78
  79 config CC_OPTIMIZE_FOR_SIZE
  80         bool "Optimize for size"
  81         help
  82           Enabling this option will pass "-Os" to gcc, resulting in a smaller
  83           U-Boot image.
  84
  85           This option is enabled by default for U-Boot.
  86
  87 config CC_OPTIMIZE_FOR_SPEED
  88         bool "Optimize for speed"
  89         help
  90           Enabling this option will pass "-O2" to gcc, resulting in a faster
  91           U-Boot image.
  92
  93 config CC_OPTIMIZE_FOR_DEBUG
  94         bool "Optimize for debugging"
  95         help
  96           Enabling this option will pass "-Og" to gcc, enabling optimizations
  97           which don't interfere with debugging.
  98
  99 endchoice
 100
 101 config OPTIMIZE_INLINING
 102         bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
 103         help
 104           This option determines if U-Boot forces gcc to inline the functions
 105           developers have marked 'inline'. Doing so takes away freedom from gcc to
 106           do what it thinks is best, which is desirable in some cases for size
 107           reasons.
 108
 109 config SPL_OPTIMIZE_INLINING
 110         bool "Allow compiler to uninline functions marked 'inline' in SPL"
 111         depends on SPL
 112         help
 113           This option determines if U-Boot forces gcc to inline the functions
 114           developers have marked 'inline'. Doing so takes away freedom from gcc to
 115           do what it thinks is best, which is desirable in some cases for size
 116           reasons.
 117
 118 config ARCH_SUPPORTS_LTO
 119         bool
 120
 121 config LTO
 122         bool "Enable Link Time Optimizations"
 123         depends on ARCH_SUPPORTS_LTO
 124         help
 125           This option enables Link Time Optimization (LTO), a mechanism which
 126           allows the compiler to optimize between different compilation units.
 127
 128           This can optimize away dead code paths, resulting in smaller binary
 129           size (if CC_OPTIMIZE_FOR_SIZE is enabled).
 130
 131           This option is not available for every architecture and may
 132           introduce bugs.
 133
 134           Currently, when compiling with GCC, due to a weird bug regarding
 135           jobserver, the final linking will not respect make's --jobs argument.
 136           Instead all available processors will be used (as reported by the
 137           nproc command).
 138
 139           If unsure, say n.
 140
 141 config TPL_OPTIMIZE_INLINING
 142         bool "Allow compiler to uninline functions marked 'inline' in TPL"
 143         depends on TPL
 144         help
 145           This option determines if U-Boot forces gcc to inline the functions
 146           developers have marked 'inline'. Doing so takes away freedom from gcc to
 147           do what it thinks is best, which is desirable in some cases for size
 148           reasons.
 149
 150 config CC_COVERAGE
 151         bool "Enable code coverage analysis"
 152         depends on SANDBOX
 153         help
 154           Enabling this option will pass "--coverage" to gcc to compile
 155           and link code instrumented for coverage analysis.
 156
 157 config ASAN
 158         bool "Enable AddressSanitizer"
 159         depends on SANDBOX
 160         help
 161           Enables AddressSanitizer to discover out-of-bounds accesses,
 162           use-after-free, double-free and memory leaks.
 163
 164 config FUZZ
 165         bool "Enable fuzzing"
 166         depends on CC_IS_CLANG
 167         depends on DM_FUZZING_ENGINE
 168         select ASAN
 169         help
 170           Enables the fuzzing infrastructure to generate fuzzing data and run
 171           fuzz tests.
 172
 173 config CC_HAS_ASM_INLINE
 174         def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 175
 176 config XEN
 177         bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
 178         help
 179           Enabling this option will make U-Boot be run as a bootloader
 180           for XEN [1] Virtual Machine.
 181
 182           Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
 183           for para-virtualization. Xen can organize the safe execution of several
 184           virtual machines on the same physical system with performance close to
 185           native. It is used as the basis for a number of different commercial and
 186           open source applications, such as: server virtualization, Infrastructure
 187           as a Service (IaaS), desktop virtualization, security applications,
 188           embedded and hardware appliances.
 189           Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
 190           Xen to use the device drivers for the Domain-0 kernel by default.
 191
 192           [1] - https://xenproject.org/
 193
 194 config DISTRO_DEFAULTS
 195         bool "Select defaults suitable for booting general purpose Linux distributions"
 196         select AUTO_COMPLETE
 197         select CMDLINE_EDITING
 198         select CMD_BOOTI if ARM64
 199         select CMD_BOOTZ if ARM && !ARM64
 200         select CMD_DHCP if CMD_NET
 201         select CMD_ENV_EXISTS
 202         select CMD_EXT2
 203         select CMD_EXT4
 204         select CMD_FAT
 205         select CMD_FS_GENERIC
 206         select CMD_PART if PARTITIONS
 207         select CMD_PING if CMD_NET
 208         select CMD_PXE if NET
 209         select CMD_SYSBOOT
 210         select ENV_VARS_UBOOT_CONFIG
 211         select HUSH_PARSER
 212         select SUPPORT_RAW_INITRD
 213         select SYS_LONGHELP
 214         imply CMD_MII if NET
 215         imply USB_STORAGE
 216         imply USE_BOOTCOMMAND
 217         help
 218           Select this to enable various options and commands which are suitable
 219           for building u-boot for booting general purpose Linux distributions.
 220
 221 config ENV_VARS_UBOOT_CONFIG
 222         bool "Add arch, board, vendor and soc variables to default environment"
 223         help
 224           Define this in order to add variables describing the
 225           U-Boot build configuration to the default environment.
 226           These will be named arch, cpu, board, vendor, and soc.
 227           Enabling this option will cause the following to be defined:
 228           - CONFIG_SYS_ARCH
 229           - CONFIG_SYS_CPU
 230           - CONFIG_SYS_BOARD
 231           - CONFIG_SYS_VENDOR
 232           - CONFIG_SYS_SOC
 233
 234 config NR_DRAM_BANKS
 235         int "Number of DRAM banks"
 236         default 1 if ARCH_SUNXI || ARCH_OWL
 237         default 4
 238         help
 239           This defines the number of DRAM banks.
 240
 241 config SYS_BOOT_GET_CMDLINE
 242         bool "Enable kernel command line setup"
 243         help
 244           Enables allocating and saving kernel cmdline in space between
 245           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 246
 247 config SYS_BARGSIZE
 248         int "Size of kernel command line buffer in bytes"
 249         depends on SYS_BOOT_GET_CMDLINE
 250         default 512
 251         help
 252           Buffer size for Boot Arguments which are passed to the application
 253           (usually a Linux kernel) when it is booted
 254
 255 config SYS_BOOT_GET_KBD
 256         bool "Enable kernel board information setup"
 257         help
 258           Enables allocating and saving a kernel copy of the bd_info in
 259           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 260
 261 config HAS_CUSTOM_SYS_INIT_SP_ADDR
 262         bool "Use a custom location for the initial stack pointer address"
 263         depends on ARC || (ARM && !INIT_SP_RELATIVE) || MIPS || PPC || RISCV
 264         default y if TFABOOT
 265         help
 266           Typically, we use an initial stack pointer address that is calculated
 267           by taking the statically defined CONFIG_SYS_INIT_RAM_ADDR, adding the
 268           statically defined CONFIG_SYS_INIT_RAM_SIZE and then subtracting the
 269           build-time constant of GENERATED_GBL_DATA_SIZE.  On MIPS a different
 270           but statica calculation is performed.  However, some platforms will
 271           take a different approach.  Say Y here to define the address statically
 272           instead.
 273
 274 config CUSTOM_SYS_INIT_SP_ADDR
 275         hex "Static location for the initial stack pointer"
 276         depends on HAS_CUSTOM_SYS_INIT_SP_ADDR
 277         default SYS_TEXT_BASE if TFABOOT
 278
 279 config SYS_MALLOC_F
 280         bool "Enable malloc() pool before relocation"
 281         default y if DM
 282
 283         help
 284           Before relocation, memory is very limited on many platforms. Still,
 285           we can provide a small malloc() pool if needed. Driver model in
 286           particular needs this to operate, so that it can allocate the
 287           initial serial device and any others that are needed.
 288
 289 config SYS_MALLOC_F_LEN
 290         hex "Size of malloc() pool before relocation"
 291         depends on SYS_MALLOC_F
 292         default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
 293                          ROCKCHIP_RK3308 || ROCKCHIP_RV1108
 294         default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
 295         default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
 296                          ROCKCHIP_RK322X || X86
 297         default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
 298         default 0x1800 if ARCH_TEGRA
 299         default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
 300                           ROCKCHIP_RK3399
 301         default 0x8000 if RCAR_GEN3
 302         default 0x10000 if ARCH_IMX8 || ARCH_IMX8M
 303         default 0x2000
 304         help
 305           Before relocation, memory is very limited on many platforms. Still,
 306           we can provide a small malloc() pool if needed. Driver model in
 307           particular needs this to operate, so that it can allocate the
 308           initial serial device and any others that are needed.
 309
 310 config SYS_MALLOC_LEN
 311         hex "Define memory for Dynamic allocation"
 312         default 0x4000000 if SANDBOX
 313         default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
 314         default 0x200000 if ARCH_BMIPS || X86
 315         default 0x4020000 if SUNXI_MINIMUM_DRAM_MB >= 256
 316         default 0x220000 if SUNXI_MINIMUM_DRAM_MB >= 64
 317         default 0x120000 if SUNXI_MINIMUM_DRAM_MB >= 32
 318         default 0x400000
 319         help
 320           This defines memory to be allocated for Dynamic allocation
 321           TODO: Use for other architectures
 322
 323 config SPL_SYS_MALLOC_F_LEN
 324         hex "Size of malloc() pool in SPL"
 325         depends on SYS_MALLOC_F && SPL
 326         default 0 if !SPL_FRAMEWORK
 327         default 0x2800 if RCAR_GEN3
 328         default 0x2000 if IMX8MQ
 329         default SYS_MALLOC_F_LEN
 330         help
 331           In SPL memory is very limited on many platforms. Still,
 332           we can provide a small malloc() pool if needed. Driver model in
 333           particular needs this to operate, so that it can allocate the
 334           initial serial device and any others that are needed.
 335
 336           It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
 337           malloc() region in SDRAM once it is inited.
 338
 339 config TPL_SYS_MALLOC_F_LEN
 340         hex "Size of malloc() pool in TPL"
 341         depends on SYS_MALLOC_F && TPL
 342         default SPL_SYS_MALLOC_F_LEN
 343         help
 344           In TPL memory is very limited on many platforms. Still,
 345           we can provide a small malloc() pool if needed. Driver model in
 346           particular needs this to operate, so that it can allocate the
 347           initial serial device and any others that are needed.
 348
 349 config VALGRIND
 350         bool "Inform valgrind about memory allocations"
 351         depends on !RISCV
 352         help
 353           Valgrind is an instrumentation framework for building dynamic analysis
 354           tools. In particular, it may be used to detect memory management bugs
 355           in U-Boot. It relies on knowing when heap blocks are allocated in
 356           order to give accurate results. This happens automatically for
 357           standard allocator functions provided by the host OS. However, this
 358           doesn't automatically happen for U-Boot's malloc implementation.
 359
 360           Enable this option to annotate U-Boot's malloc implementation so that
 361           it can be handled accurately by Valgrind. If you aren't planning on
 362           using valgrind to debug U-Boot, say 'n'.
 363
 364 config VPL_SYS_MALLOC_F_LEN
 365         hex "Size of malloc() pool in VPL before relocation"
 366         depends on SYS_MALLOC_F && VPL
 367         default SYS_MALLOC_F_LEN
 368         help
 369           Before relocation, memory is very limited on many platforms. Still,
 370           we can provide a small malloc() pool if needed. Driver model in
 371           particular needs this to operate, so that it can allocate the
 372           initial serial device and any others that are needed.
 373
 374 menuconfig EXPERT
 375         bool "Configure standard U-Boot features (expert users)"
 376         default y
 377         help
 378           This option allows certain base U-Boot options and settings
 379           to be disabled or tweaked. This is for specialized
 380           environments which can tolerate a "non-standard" U-Boot.
 381           Use this only if you really know what you are doing.
 382
 383 if EXPERT
 384         config SYS_MALLOC_CLEAR_ON_INIT
 385         bool "Init with zeros the memory reserved for malloc (slow)"
 386         default y
 387         help
 388           This setting is enabled by default. The reserved malloc
 389           memory is initialized with zeros, so first malloc calls
 390           will return the pointer to the zeroed memory. But this
 391           slows the boot time.
 392
 393           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 394           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 395           Then the boot time can be significantly reduced.
 396           Warning:
 397           When disabling this, please check if malloc calls, maybe
 398           should be replaced by calloc - if one expects zeroed memory.
 399
 400 config SYS_MALLOC_DEFAULT_TO_INIT
 401         bool "Default malloc to init while reserving the memory for it"
 402         help
 403           It may happen that one needs to move the dynamic allocation
 404           from one to another memory range, eg. when moving the malloc
 405           from the limited static to a potentially large dynamic (DDR)
 406           memory.
 407
 408           If so then on top of setting the updated memory aside one
 409           needs to bring the malloc init.
 410
 411           If such a scenario is sought choose yes.
 412
 413 config TOOLS_DEBUG
 414         bool "Enable debug information for tools"
 415         help
 416           Enable generation of debug information for tools such as mkimage.
 417           This can be used for debugging purposes. With debug information
 418           it is possible to set breakpoints on particular lines, single-step
 419           debug through the source code, etc.
 420
 421 endif # EXPERT
 422
 423 config PHYS_64BIT
 424         bool "64bit physical address support"
 425         help
 426           Say Y here to support 64bit physical memory address.
 427           This can be used not only for 64bit SoCs, but also for
 428           large physical address extension on 32bit SoCs.
 429
 430 config HAS_ROM
 431         bool
 432         select BINMAN
 433         help
 434           Enables building of a u-boot.rom target. This collects U-Boot and
 435           any necessary binary blobs.
 436
 437 config SPL_IMAGE
 438         string "SPL image used in the combined SPL+U-Boot image"
 439         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 440         default "spl/u-boot-spl.bin"
 441         depends on SPL
 442         help
 443           Select the SPL build target that shall be generated by the SPL
 444           build process (default spl/u-boot-spl.bin). This image will be
 445           used to generate a combined image with SPL and main U-Boot
 446           proper as one single image.
 447
 448 config REMAKE_ELF
 449         bool "Recreate an ELF image from raw U-Boot binary"
 450         help
 451           Enable this to recreate an ELF image (u-boot.elf) from the raw
 452           U-Boot binary (u-boot.bin), which may already have been statically
 453           relocated and may already have a device-tree appended to it.
 454
 455 config BUILD_TARGET
 456         string "Build target special images"
 457         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 458         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 459         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 460         default "u-boot-elf.srec" if RCAR_GEN3
 461         default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
 462                                 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
 463         default "u-boot.kwb" if ARCH_KIRKWOOD
 464         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 465         default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
 466         help
 467           Some SoCs need special image types (e.g. U-Boot binary
 468           with a special header) as build targets. By defining
 469           CONFIG_BUILD_TARGET in the SoC / board header, this
 470           special image will be automatically built upon calling
 471           make / buildman.
 472
 473 config HAS_BOARD_SIZE_LIMIT
 474         bool "Define a maximum size for the U-Boot image"
 475         default y if RCAR_GEN3
 476         help
 477           In some cases, we need to enforce a hard limit on how big the U-Boot
 478           image itself can be.
 479
 480 config BOARD_SIZE_LIMIT
 481         int "Maximum size of the U-Boot image in bytes"
 482         default 1048576 if RCAR_GEN3
 483         depends on HAS_BOARD_SIZE_LIMIT
 484         help
 485           Maximum size of the U-Boot image. When defined, the build system
 486           checks that the actual size does not exceed it.  This does not
 487           include SPL nor TPL, on platforms that use that functionality, they
 488           have a separate option to restict size.
 489
 490 config SYS_CUSTOM_LDSCRIPT
 491         bool "Use a custom location for the U-Boot linker script"
 492         help
 493           Normally when linking U-Boot we will look in the board directory,
 494           the CPU directory and finally the "cpu" directory of the architecture
 495           for the ile "u-boot.lds" and use that as our linker.  However, in
 496           some cases we need to provide a different linker script.  To do so,
 497           enable this option and then provide the location under
 498           CONFIG_SYS_LDSCRIPT.
 499
 500 config SYS_LDSCRIPT
 501         depends on SYS_CUSTOM_LDSCRIPT
 502         string "Custom ldscript location"
 503         help
 504           Path within the source tree to the linker script to use for the
 505           main U-Boot binary.
 506
 507 config SYS_LOAD_ADDR
 508         hex "Address in memory to use by default"
 509         default 0x01000000 if ARCH_SOCFPGA
 510         default 0x02000000 if PPC || X86
 511         default 0x81000000 if MACH_SUNIV
 512         default 0x22000000 if MACH_SUN9I
 513         default 0x42000000 if ARCH_SUNXI
 514         default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
 515         default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 516         default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 517         default 0x80800000 if ARCH_MX7
 518         default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
 519         help
 520           Address in memory to use as the default safe load address.
 521
 522 config ERR_PTR_OFFSET
 523         hex
 524         default 0x0
 525         help
 526           Some U-Boot pointers have redundant information, so we can use a
 527           scheme where we can return either an error code or a pointer with the
 528           same return value. The default implementation just casts the pointer
 529           to a number, however, this may fail on platforms where the end of the
 530           address range is used for valid pointers (e.g. 0xffffff00 is a valid
 531           heap pointer in socfpga SPL).
 532           For such platforms, this value provides an upper range of those error
 533           pointer values - up to 'MAX_ERRNO' bytes below this value must be
 534           unused/invalid addresses.
 535
 536 config PLATFORM_ELFENTRY
 537         string
 538         default "__start" if MIPS
 539         default "_start"
 540
 541 config STACK_SIZE
 542         hex "Define max stack size that can be used by U-Boot"
 543         default 0x4000000 if ARCH_VERSAL_NET || ARCH_VERSAL || ARCH_ZYNQMP
 544         default 0x200000 if MICROBLAZE
 545         default 0x1000000
 546         help
 547           Define Max stack size that can be used by U-Boot. This value is used
 548           by the UEFI sub-system. On some boards initrd_high is calculated as
 549           base stack pointer minus this stack size.
 550
 551 config SYS_MEM_TOP_HIDE
 552         hex "Exclude some memory from U-Boot / OS information"
 553         default 0x0
 554         help
 555           If set, this specified memory area will get subtracted from the top
 556           (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
 557           gd->ram_size the OS / next stage should gets passed the now
 558           "corrected" memory size and won't touch it either.
 559           WARNING: Please make sure that this value is a multiple of the OS
 560           page size.
 561
 562 config SYS_HAS_SRAM
 563         bool
 564         default y if TARGET_PIC32MZDASK
 565         default y if TARGET_DEVKIT8000
 566         default y if TARGET_TRICORDER
 567         help
 568           Enable this to allow support for the on board SRAM.
 569           SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
 570           SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
 571
 572 config SYS_SRAM_BASE
 573         hex
 574         default 0x80000000 if TARGET_PIC32MZDASK
 575         default 0x40200000 if TARGET_DEVKIT8000
 576         default 0x40200000 if TARGET_TRICORDER
 577         default 0x0
 578
 579 config SYS_SRAM_SIZE
 580         hex
 581         default 0x00080000 if TARGET_PIC32MZDASK
 582         default 0x10000 if TARGET_DEVKIT8000
 583         default 0x10000 if TARGET_TRICORDER
 584         default 0x0
 585
 586 config MP
 587         bool "Support for multiprocessor"
 588         help
 589           This provides an option to bringup different processors
 590           in multiprocessor cases.
 591
 592 config EXAMPLES
 593         bool "Compile API examples"
 594         depends on !SANDBOX
 595         default y if ARCH_QEMU
 596         help
 597           U-Boot provides an API for standalone applications. Examples are
 598           provided in directory examples/.
 599
 600 endmenu         # General setup
 601
 602 source "api/Kconfig"
 603
 604 source "boot/Kconfig"
 605
 606 source "common/Kconfig"
 607
 608 source "cmd/Kconfig"
 609
 610 source "disk/Kconfig"
 611
 612 source "dts/Kconfig"
 613
 614 source "env/Kconfig"
 615
 616 source "net/Kconfig"
 617
 618 source "drivers/Kconfig"
 619
 620 source "fs/Kconfig"
 621
 622 source "lib/Kconfig"
 623
 624 source "test/Kconfig"
 625
 626 source "tools/Kconfig"