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.
   6mainmenu "U-Boot $(UBOOTVERSION) Configuration"
   8comment "Compiler: $(CC_VERSION_TEXT)"
  10source "scripts/Kconfig.include"
  12# Allow defaults in arch-specific code to override any given here
  13source "arch/Kconfig"
  15menu "General setup"
  17config BROKEN
  18        bool
  19        help
  20          This option cannot be enabled. It is used as dependency
  21          for broken and incomplete features.
  23config 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.
  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.
  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.
  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.
  53          (The actual string used here is the first eight characters produced
  54          by running the command:
  56            $ git rev-parse --verify HEAD
  58          which is done within the script "scripts/setlocalversion".)
  60config CC_IS_GCC
  61        def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
  63config GCC_VERSION
  64        int
  65        default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
  66        default 0
  68config CC_IS_CLANG
  69        def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
  71config CLANG_VERSION
  72        int
  73        default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
  76        bool "Optimize for size"
  77        default y
  78        help
  79          Enabling this option will pass "-Os" instead of "-O2" to gcc
  80          resulting in a smaller U-Boot image.
  82          This option is enabled by default for U-Boot.
  85        bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
  86        default n
  87        help
  88          This option determines if U-Boot forces gcc to inline the functions
  89          developers have marked 'inline'. Doing so takes away freedom from gcc to
  90          do what it thinks is best, which is desirable in some cases for size
  91          reasons.
  94        bool "Allow compiler to uninline functions marked 'inline' in SPL"
  95        depends on SPL
  96        default n
  97        help
  98          This option determines if U-Boot forces gcc to inline the functions
  99          developers have marked 'inline'. Doing so takes away freedom from gcc to
 100          do what it thinks is best, which is desirable in some cases for size
 101          reasons.
 104        bool
 106config LTO
 107        bool "Enable Link Time Optimizations"
 108        depends on ARCH_SUPPORTS_LTO
 109        default n
 110        help
 111          This option enables Link Time Optimization (LTO), a mechanism which
 112          allows the compiler to optimize between different compilation units.
 114          This can optimize away dead code paths, resulting in smaller binary
 115          size (if CC_OPTIMIZE_FOR_SIZE is enabled).
 117          This option is not available for every architecture and may
 118          introduce bugs.
 120          Currently, when compiling with GCC, due to a weird bug regarding
 121          jobserver, the final linking will not respect make's --jobs argument.
 122          Instead all available processors will be used (as reported by the
 123          nproc command).
 125          If unsure, say n.
 128        bool "Allow compiler to uninline functions marked 'inline' in TPL"
 129        depends on TPL
 130        default n
 131        help
 132          This option determines if U-Boot forces gcc to inline the functions
 133          developers have marked 'inline'. Doing so takes away freedom from gcc to
 134          do what it thinks is best, which is desirable in some cases for size
 135          reasons.
 137config CC_COVERAGE
 138        bool "Enable code coverage analysis"
 139        depends on SANDBOX
 140        help
 141          Enabling this option will pass "--coverage" to gcc to compile
 142          and link code instrumented for coverage analysis.
 144config CC_HAS_ASM_INLINE
 145        def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 147config XEN
 148        bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
 149        help
 150          Enabling this option will make U-Boot be run as a bootloader
 151          for XEN [1] Virtual Machine.
 153          Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
 154          for para-virtualization. Xen can organize the safe execution of several
 155          virtual machines on the same physical system with performance close to
 156          native. It is used as the basis for a number of different commercial and
 157          open source applications, such as: server virtualization, Infrastructure
 158          as a Service (IaaS), desktop virtualization, security applications,
 159          embedded and hardware appliances.
 160          Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
 161          Xen to use the device drivers for the Domain-0 kernel by default.
 163          [1] - https://xenproject.org/
 166        bool "Select defaults suitable for booting general purpose Linux distributions"
 167        select AUTO_COMPLETE
 168        select CMDLINE_EDITING
 169        select CMD_BOOTI if ARM64
 170        select CMD_BOOTZ if ARM && !ARM64
 171        select CMD_DHCP if CMD_NET
 172        select CMD_ENV_EXISTS
 173        select CMD_EXT2
 174        select CMD_EXT4
 175        select CMD_FAT
 176        select CMD_FS_GENERIC
 177        select CMD_PART if PARTITIONS
 178        select CMD_PING if CMD_NET
 179        select CMD_PXE if NET
 180        select CMD_SYSBOOT
 181        select ENV_VARS_UBOOT_CONFIG
 182        select HUSH_PARSER
 183        select SUPPORT_RAW_INITRD
 184        select SYS_LONGHELP
 185        imply CMD_MII if NET
 186        imply USB_STORAGE
 187        imply USE_BOOTCOMMAND
 188        help
 189          Select this to enable various options and commands which are suitable
 190          for building u-boot for booting general purpose Linux distributions.
 193        bool "Add arch, board, vendor and soc variables to default environment"
 194        help
 195          Define this in order to add variables describing the
 196          U-Boot build configuration to the default environment.
 197          These will be named arch, cpu, board, vendor, and soc.
 198          Enabling this option will cause the following to be defined:
 199          - CONFIG_SYS_ARCH
 200          - CONFIG_SYS_CPU
 201          - CONFIG_SYS_BOARD
 202          - CONFIG_SYS_VENDOR
 203          - CONFIG_SYS_SOC
 205config NR_DRAM_BANKS
 206        int "Number of DRAM banks"
 207        default 1 if ARCH_SUNXI || ARCH_OWL
 208        default 4
 209        help
 210          This defines the number of DRAM banks.
 213        bool "Enable kernel command line setup"
 214        help
 215          Enables allocating and saving kernel cmdline in space between
 216          "bootm_low" and "bootm_low" + BOOTMAPSZ.
 218config SYS_BOOT_GET_KBD
 219        bool "Enable kernel board information setup"
 220        help
 221          Enables allocating and saving a kernel copy of the bd_info in
 222          space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 224config SYS_MALLOC_F
 225        bool "Enable malloc() pool before relocation"
 226        default y if DM
 228        help
 229          Before relocation, memory is very limited on many platforms. Still,
 230          we can provide a small malloc() pool if needed. Driver model in
 231          particular needs this to operate, so that it can allocate the
 232          initial serial device and any others that are needed.
 234config SYS_MALLOC_F_LEN
 235        hex "Size of malloc() pool before relocation"
 236        depends on SYS_MALLOC_F
 237        default 0x1000 if AM33XX
 238        default 0x4000 if SANDBOX
 239        default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
 240                           ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
 241                           ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
 242                           ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
 243        default 0x400
 244        help
 245          Before relocation, memory is very limited on many platforms. Still,
 246          we can provide a small malloc() pool if needed. Driver model in
 247          particular needs this to operate, so that it can allocate the
 248          initial serial device and any others that are needed.
 250config SYS_MALLOC_LEN
 251        hex "Define memory for Dynamic allocation"
 252        depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
 253        default 0x2000000 if ARCH_ROCKCHIP
 254        help
 255          This defines memory to be allocated for Dynamic allocation
 256          TODO: Use for other architectures
 259        hex "Size of malloc() pool in SPL"
 260        depends on SYS_MALLOC_F && SPL
 261        default 0x2800 if RCAR_GEN3
 262        default SYS_MALLOC_F_LEN
 263        help
 264          In SPL memory is very limited on many platforms. Still,
 265          we can provide a small malloc() pool if needed. Driver model in
 266          particular needs this to operate, so that it can allocate the
 267          initial serial device and any others that are needed.
 269          It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
 270          malloc() region in SDRAM once it is inited.
 273        hex "Size of malloc() pool in TPL"
 274        depends on SYS_MALLOC_F && TPL
 275        default SPL_SYS_MALLOC_F_LEN
 276        help
 277          In TPL memory is very limited on many platforms. Still,
 278          we can provide a small malloc() pool if needed. Driver model in
 279          particular needs this to operate, so that it can allocate the
 280          initial serial device and any others that are needed.
 282menuconfig EXPERT
 283        bool "Configure standard U-Boot features (expert users)"
 284        default y
 285        help
 286          This option allows certain base U-Boot options and settings
 287          to be disabled or tweaked. This is for specialized
 288          environments which can tolerate a "non-standard" U-Boot.
 289          Use this only if you really know what you are doing.
 291if EXPERT
 292        config SYS_MALLOC_CLEAR_ON_INIT
 293        bool "Init with zeros the memory reserved for malloc (slow)"
 294        default y
 295        help
 296          This setting is enabled by default. The reserved malloc
 297          memory is initialized with zeros, so first malloc calls
 298          will return the pointer to the zeroed memory. But this
 299          slows the boot time.
 301          It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 302          value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 303          Then the boot time can be significantly reduced.
 304          Warning:
 305          When disabling this, please check if malloc calls, maybe
 306          should be replaced by calloc - if one expects zeroed memory.
 309        bool "Default malloc to init while reserving the memory for it"
 310        default n
 311        help
 312          It may happen that one needs to move the dynamic allocation
 313          from one to another memory range, eg. when moving the malloc
 314          from the limited static to a potentially large dynamic (DDR)
 315          memory.
 317          If so then on top of setting the updated memory aside one
 318          needs to bring the malloc init.
 320          If such a scenario is sought choose yes.
 322config TOOLS_DEBUG
 323        bool "Enable debug information for tools"
 324        help
 325          Enable generation of debug information for tools such as mkimage.
 326          This can be used for debugging purposes. With debug information
 327          it is possible to set breakpoints on particular lines, single-step
 328          debug through the source code, etc.
 330endif # EXPERT
 332config PHYS_64BIT
 333        bool "64bit physical address support"
 334        help
 335          Say Y here to support 64bit physical memory address.
 336          This can be used not only for 64bit SoCs, but also for
 337          large physical address extension on 32bit SoCs.
 339config HAS_ROM
 340        bool
 341        select BINMAN
 342        help
 343          Enables building of a u-boot.rom target. This collects U-Boot and
 344          any necessary binary blobs.
 346config SPL_IMAGE
 347        string "SPL image used in the combined SPL+U-Boot image"
 348        default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 349        default "spl/u-boot-spl.bin"
 350        depends on SPL
 351        help
 352          Select the SPL build target that shall be generated by the SPL
 353          build process (default spl/u-boot-spl.bin). This image will be
 354          used to generate a combined image with SPL and main U-Boot
 355          proper as one single image.
 357config BUILD_TARGET
 358        string "Build target special images"
 359        default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 360        default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 361        default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 362        default "u-boot-elf.srec" if RCAR_GEN3
 363        default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
 364                                ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
 365        default "u-boot.kwb" if ARCH_KIRKWOOD
 366        default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 367        default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
 368        help
 369          Some SoCs need special image types (e.g. U-Boot binary
 370          with a special header) as build targets. By defining
 371          CONFIG_BUILD_TARGET in the SoC / board header, this
 372          special image will be automatically built upon calling
 373          make / buildman.
 376        bool "Use a custom location for the U-Boot linker script"
 377        help
 378          Normally when linking U-Boot we will look in the board directory,
 379          the CPU directory and finally the "cpu" directory of the architecture
 380          for the ile "u-boot.lds" and use that as our linker.  However, in
 381          some cases we need to provide a different linker script.  To do so,
 382          enable this option and then provide the location under
 383          CONFIG_SYS_LDSCRIPT.
 385config SYS_LDSCRIPT
 386        depends on SYS_CUSTOM_LDSCRIPT
 387        string "Custom ldscript location"
 388        help
 389          Path within the source tree to the linker script to use for the
 390          main U-Boot binary.
 392config ERR_PTR_OFFSET
 393        hex
 394        default 0x0
 395        help
 396          Some U-Boot pointers have redundant information, so we can use a
 397          scheme where we can return either an error code or a pointer with the
 398          same return value. The default implementation just casts the pointer
 399          to a number, however, this may fail on platforms where the end of the
 400          address range is used for valid pointers (e.g. 0xffffff00 is a valid
 401          heap pointer in socfpga SPL).
 402          For such platforms, this value provides an upper range of those error
 403          pointer values - up to 'MAX_ERRNO' bytes below this value must be
 404          unused/invalid addresses.
 407        string
 408        default "__start" if MIPS
 409        default "_start"
 411config STACK_SIZE
 412        hex "Define max stack size that can be used by U-Boot"
 413        default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
 414        default 0x200000 if MICROBLAZE
 415        default 0x1000000
 416        help
 417          Define Max stack size that can be used by U-Boot. This value is used
 418          by the UEFI sub-system. On some boards initrd_high is calculated as
 419          base stack pointer minus this stack size.
 421config SYS_HAS_SRAM
 422        bool
 423        default y if TARGET_PIC32MZDASK
 424        default y if TARGET_DEVKIT8000
 425        default y if TARGET_TRICORDER
 426        default n
 427        help
 428          Enable this to allow support for the on board SRAM.
 429          SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
 430          SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
 432config SYS_SRAM_BASE
 433        hex
 434        default 0x80000000 if TARGET_PIC32MZDASK
 435        default 0x40200000 if TARGET_DEVKIT8000
 436        default 0x40200000 if TARGET_TRICORDER
 437        default 0x0
 439config SYS_SRAM_SIZE
 440        hex
 441        default 0x00080000 if TARGET_PIC32MZDASK
 442        default 0x10000 if TARGET_DEVKIT8000
 443        default 0x10000 if TARGET_TRICORDER
 444        default 0x0
 446config EXAMPLES
 447        bool "Compile API examples"
 448        depends on !SANDBOX
 449        default y if ARCH_QEMU
 450        help
 451          U-Boot provides an API for standalone applications. Examples are
 452          provided in directory examples/.
 454endmenu         # General setup
 456source "api/Kconfig"
 458source "common/Kconfig"
 460source "cmd/Kconfig"
 462source "disk/Kconfig"
 464source "dts/Kconfig"
 466source "env/Kconfig"
 468source "net/Kconfig"
 470source "drivers/Kconfig"
 472source "fs/Kconfig"
 474source "lib/Kconfig"
 476source "test/Kconfig"
 478source "tools/Kconfig"