# # For a description of the syntax of this configuration file, # see the file Documentation/kbuild/kconfig-language.txt in the # Linux kernel source tree. # mainmenu "U-Boot $(UBOOTVERSION) Configuration" comment "Compiler: $(CC_VERSION_TEXT)" source "scripts/Kconfig.include" # Allow defaults in arch-specific code to override any given here source "arch/Kconfig" menu "General setup" config BROKEN bool help This option cannot be enabled. It is used as dependency for broken and incomplete features. config DEPRECATED bool help This option cannot be enabled. It it used as a dependency for code that relies on deprecated features that will be removed and the conversion deadline has passed. config LOCALVERSION string "Local version - append to U-Boot release" help Append an extra string to the end of your U-Boot version. This will show up in your boot log, for example. The string you set here will be appended after the contents of any files with a filename matching localversion* in your object and source tree, in that order. Your total string can be a maximum of 64 characters. config LOCALVERSION_AUTO bool "Automatically append version information to the version string" default y help This will try to automatically determine if the current tree is a release tree by looking for Git tags that belong to the current top of tree revision. A string of the format -gxxxxxxxx will be added to the localversion if a Git-based tree is found. The string generated by this will be appended after any matching localversion* files, and after the value set in CONFIG_LOCALVERSION. (The actual string used here is the first eight characters produced by running the command: $ git rev-parse --verify HEAD which is done within the script "scripts/setlocalversion".) config CC_IS_GCC def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc) config GCC_VERSION int default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC default 0 config CC_IS_CLANG def_bool $(success,$(CC) --version | head -n 1 | grep -q clang) config CLANG_VERSION int default $(shell,$(srctree)/scripts/clang-version.sh $(CC)) choice prompt "Optimization level" default CC_OPTIMIZE_FOR_SIZE config CC_OPTIMIZE_FOR_SIZE bool "Optimize for size" help Enabling this option will pass "-Os" to gcc, resulting in a smaller U-Boot image. This option is enabled by default for U-Boot. config CC_OPTIMIZE_FOR_SPEED bool "Optimize for speed" help Enabling this option will pass "-O2" to gcc, resulting in a faster U-Boot image. config CC_OPTIMIZE_FOR_DEBUG bool "Optimize for debugging" help Enabling this option will pass "-Og" to gcc, enabling optimizations which don't interfere with debugging. endchoice config OPTIMIZE_INLINING bool "Allow compiler to uninline functions marked 'inline' in full U-Boot" help This option determines if U-Boot forces gcc to inline the functions developers have marked 'inline'. Doing so takes away freedom from gcc to do what it thinks is best, which is desirable in some cases for size reasons. config SPL_OPTIMIZE_INLINING bool "Allow compiler to uninline functions marked 'inline' in SPL" depends on SPL help This option determines if U-Boot forces gcc to inline the functions developers have marked 'inline'. Doing so takes away freedom from gcc to do what it thinks is best, which is desirable in some cases for size reasons. config ARCH_SUPPORTS_LTO bool config LTO bool "Enable Link Time Optimizations" depends on ARCH_SUPPORTS_LTO help This option enables Link Time Optimization (LTO), a mechanism which allows the compiler to optimize between different compilation units. This can optimize away dead code paths, resulting in smaller binary size (if CC_OPTIMIZE_FOR_SIZE is enabled). This option is not available for every architecture and may introduce bugs. Currently, when compiling with GCC, due to a weird bug regarding jobserver, the final linking will not respect make's --jobs argument. Instead all available processors will be used (as reported by the nproc command). If unsure, say n. config TPL_OPTIMIZE_INLINING bool "Allow compiler to uninline functions marked 'inline' in TPL" depends on TPL help This option determines if U-Boot forces gcc to inline the functions developers have marked 'inline'. Doing so takes away freedom from gcc to do what it thinks is best, which is desirable in some cases for size reasons. config CC_COVERAGE bool "Enable code coverage analysis" depends on SANDBOX help Enabling this option will pass "--coverage" to gcc to compile and link code instrumented for coverage analysis. config ASAN bool "Enable AddressSanitizer" depends on SANDBOX help Enables AddressSanitizer to discover out-of-bounds accesses, use-after-free, double-free and memory leaks. config CC_HAS_ASM_INLINE def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null) config XEN bool "Select U-Boot be run as a bootloader for XEN Virtual Machine" help Enabling this option will make U-Boot be run as a bootloader for XEN [1] Virtual Machine. Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support for para-virtualization. Xen can organize the safe execution of several virtual machines on the same physical system with performance close to native. It is used as the basis for a number of different commercial and open source applications, such as: server virtualization, Infrastructure as a Service (IaaS), desktop virtualization, security applications, embedded and hardware appliances. Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows Xen to use the device drivers for the Domain-0 kernel by default. [1] - https://xenproject.org/ config DISTRO_DEFAULTS bool "Select defaults suitable for booting general purpose Linux distributions" select AUTO_COMPLETE select CMDLINE_EDITING select CMD_BOOTI if ARM64 select CMD_BOOTZ if ARM && !ARM64 select CMD_DHCP if CMD_NET select CMD_ENV_EXISTS select CMD_EXT2 select CMD_EXT4 select CMD_FAT select CMD_FS_GENERIC select CMD_PART if PARTITIONS select CMD_PING if CMD_NET select CMD_PXE if NET select CMD_SYSBOOT select ENV_VARS_UBOOT_CONFIG select HUSH_PARSER select SUPPORT_RAW_INITRD select SYS_LONGHELP imply CMD_MII if NET imply USB_STORAGE imply USE_BOOTCOMMAND help Select this to enable various options and commands which are suitable for building u-boot for booting general purpose Linux distributions. config ENV_VARS_UBOOT_CONFIG bool "Add arch, board, vendor and soc variables to default environment" help Define this in order to add variables describing the U-Boot build configuration to the default environment. These will be named arch, cpu, board, vendor, and soc. Enabling this option will cause the following to be defined: - CONFIG_SYS_ARCH - CONFIG_SYS_CPU - CONFIG_SYS_BOARD - CONFIG_SYS_VENDOR - CONFIG_SYS_SOC config NR_DRAM_BANKS int "Number of DRAM banks" default 1 if ARCH_SUNXI || ARCH_OWL default 4 help This defines the number of DRAM banks. config SYS_BOOT_GET_CMDLINE bool "Enable kernel command line setup" help Enables allocating and saving kernel cmdline in space between "bootm_low" and "bootm_low" + BOOTMAPSZ. config SYS_BARGSIZE int "Size of kernel command line buffer in bytes" depends on SYS_BOOT_GET_CMDLINE default 512 help Buffer size for Boot Arguments which are passed to the application (usually a Linux kernel) when it is booted config SYS_BOOT_GET_KBD bool "Enable kernel board information setup" help Enables allocating and saving a kernel copy of the bd_info in space between "bootm_low" and "bootm_low" + BOOTMAPSZ. config HAS_CUSTOM_SYS_INIT_SP_ADDR bool "Use a custom location for the initial stack pointer address" depends on ARC || (ARM && !INIT_SP_RELATIVE) || MIPS || PPC || RISCV default y if TFABOOT help Typically, we use an initial stack pointer address that is calculated by taking the statically defined CONFIG_SYS_INIT_RAM_ADDR, adding the statically defined CONFIG_SYS_INIT_RAM_SIZE and then subtracting the build-time constant of GENERATED_GBL_DATA_SIZE. On MIPS a different but statica calculation is performed. However, some platforms will take a different approach. Say Y here to define the address statically instead. config CUSTOM_SYS_INIT_SP_ADDR hex "Static location for the initial stack pointer" depends on HAS_CUSTOM_SYS_INIT_SP_ADDR default SYS_TEXT_BASE if TFABOOT config SYS_MALLOC_F bool "Enable malloc() pool before relocation" default y if DM help Before relocation, memory is very limited on many platforms. Still, we can provide a small malloc() pool if needed. Driver model in particular needs this to operate, so that it can allocate the initial serial device and any others that are needed. config SYS_MALLOC_F_LEN hex "Size of malloc() pool before relocation" depends on SYS_MALLOC_F default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \ ROCKCHIP_RK3308 || ROCKCHIP_RV1108 default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \ ROCKCHIP_RK322X || X86 default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS default 0x1800 if ARCH_TEGRA default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \ ROCKCHIP_RK3399 default 0x8000 if RCAR_GEN3 default 0x10000 if ARCH_IMX8 || (ARCH_IMX8M && !IMX8MQ) default 0x2000 help Before relocation, memory is very limited on many platforms. Still, we can provide a small malloc() pool if needed. Driver model in particular needs this to operate, so that it can allocate the initial serial device and any others that are needed. config SYS_MALLOC_LEN hex "Define memory for Dynamic allocation" default 0x4000000 if SANDBOX default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON default 0x200000 if ARCH_BMIPS || X86 default 0x120000 if MACH_SUNIV default 0x220000 if MACH_SUN8I_V3S default 0x4020000 if ARCH_SUNXI default 0x400000 help This defines memory to be allocated for Dynamic allocation TODO: Use for other architectures config SPL_SYS_MALLOC_F_LEN hex "Size of malloc() pool in SPL" depends on SYS_MALLOC_F && SPL default 0 if !SPL_FRAMEWORK default 0x2800 if RCAR_GEN3 default SYS_MALLOC_F_LEN help In SPL memory is very limited on many platforms. Still, we can provide a small malloc() pool if needed. Driver model in particular needs this to operate, so that it can allocate the initial serial device and any others that are needed. It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new malloc() region in SDRAM once it is inited. config TPL_SYS_MALLOC_F_LEN hex "Size of malloc() pool in TPL" depends on SYS_MALLOC_F && TPL default SPL_SYS_MALLOC_F_LEN help In TPL memory is very limited on many platforms. Still, we can provide a small malloc() pool if needed. Driver model in particular needs this to operate, so that it can allocate the initial serial device and any others that are needed. config VALGRIND bool "Inform valgrind about memory allocations" depends on !RISCV help Valgrind is an instrumentation framework for building dynamic analysis tools. In particular, it may be used to detect memory management bugs in U-Boot. It relies on knowing when heap blocks are allocated in order to give accurate results. This happens automatically for standard allocator functions provided by the host OS. However, this doesn't automatically happen for U-Boot's malloc implementation. Enable this option to annotate U-Boot's malloc implementation so that it can be handled accurately by Valgrind. If you aren't planning on using valgrind to debug U-Boot, say 'n'. config VPL_SYS_MALLOC_F_LEN hex "Size of malloc() pool in VPL before relocation" depends on SYS_MALLOC_F && VPL default SYS_MALLOC_F_LEN help Before relocation, memory is very limited on many platforms. Still, we can provide a small malloc() pool if needed. Driver model in particular needs this to operate, so that it can allocate the initial serial device and any others that are needed. menuconfig EXPERT bool "Configure standard U-Boot features (expert users)" default y help This option allows certain base U-Boot options and settings to be disabled or tweaked. This is for specialized environments which can tolerate a "non-standard" U-Boot. Use this only if you really know what you are doing. if EXPERT config SYS_MALLOC_CLEAR_ON_INIT bool "Init with zeros the memory reserved for malloc (slow)" default y help This setting is enabled by default. The reserved malloc memory is initialized with zeros, so first malloc calls will return the pointer to the zeroed memory. But this slows the boot time. It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN value, has more than few MiB, e.g. when uses bzip2 or bmp logo. Then the boot time can be significantly reduced. Warning: When disabling this, please check if malloc calls, maybe should be replaced by calloc - if one expects zeroed memory. config SYS_MALLOC_DEFAULT_TO_INIT bool "Default malloc to init while reserving the memory for it" help It may happen that one needs to move the dynamic allocation from one to another memory range, eg. when moving the malloc from the limited static to a potentially large dynamic (DDR) memory. If so then on top of setting the updated memory aside one needs to bring the malloc init. If such a scenario is sought choose yes. config TOOLS_DEBUG bool "Enable debug information for tools" help Enable generation of debug information for tools such as mkimage. This can be used for debugging purposes. With debug information it is possible to set breakpoints on particular lines, single-step debug through the source code, etc. endif # EXPERT config PHYS_64BIT bool "64bit physical address support" help Say Y here to support 64bit physical memory address. This can be used not only for 64bit SoCs, but also for large physical address extension on 32bit SoCs. config HAS_ROM bool select BINMAN help Enables building of a u-boot.rom target. This collects U-Boot and any necessary binary blobs. config SPL_IMAGE string "SPL image used in the combined SPL+U-Boot image" default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT default "spl/u-boot-spl.bin" depends on SPL help Select the SPL build target that shall be generated by the SPL build process (default spl/u-boot-spl.bin). This image will be used to generate a combined image with SPL and main U-Boot proper as one single image. config REMAKE_ELF bool "Recreate an ELF image from raw U-Boot binary" help Enable this to recreate an ELF image (u-boot.elf) from the raw U-Boot binary (u-boot.bin), which may already have been statically relocated and may already have a device-tree appended to it. config BUILD_TARGET string "Build target special images" default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL default "u-boot-elf.srec" if RCAR_GEN3 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \ ARCH_SUNXI || RISCV || ARCH_ZYNQMP) default "u-boot.kwb" if ARCH_KIRKWOOD default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT default "u-boot-with-spl.imx" if ARCH_MX6 && SPL help Some SoCs need special image types (e.g. U-Boot binary with a special header) as build targets. By defining CONFIG_BUILD_TARGET in the SoC / board header, this special image will be automatically built upon calling make / buildman. config HAS_BOARD_SIZE_LIMIT bool "Define a maximum size for the U-Boot image" default y if RCAR_GEN3 help In some cases, we need to enforce a hard limit on how big the U-Boot image itself can be. config BOARD_SIZE_LIMIT int "Maximum size of the U-Boot image in bytes" default 1048576 if RCAR_GEN3 depends on HAS_BOARD_SIZE_LIMIT help Maximum size of the U-Boot image. When defined, the build system checks that the actual size does not exceed it. This does not include SPL nor TPL, on platforms that use that functionality, they have a separate option to restict size. config SYS_CUSTOM_LDSCRIPT bool "Use a custom location for the U-Boot linker script" help Normally when linking U-Boot we will look in the board directory, the CPU directory and finally the "cpu" directory of the architecture for the ile "u-boot.lds" and use that as our linker. However, in some cases we need to provide a different linker script. To do so, enable this option and then provide the location under CONFIG_SYS_LDSCRIPT. config SYS_LDSCRIPT depends on SYS_CUSTOM_LDSCRIPT string "Custom ldscript location" help Path within the source tree to the linker script to use for the main U-Boot binary. config SYS_LOAD_ADDR hex "Address in memory to use by default" default 0x01000000 if ARCH_SOCFPGA default 0x02000000 if PPC || X86 default 0x81000000 if MACH_SUNIV default 0x22000000 if MACH_SUN9I default 0x42000000 if ARCH_SUNXI default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL) default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL) default 0x80800000 if ARCH_MX7 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3 help Address in memory to use as the default safe load address. config ERR_PTR_OFFSET hex default 0x0 help Some U-Boot pointers have redundant information, so we can use a scheme where we can return either an error code or a pointer with the same return value. The default implementation just casts the pointer to a number, however, this may fail on platforms where the end of the address range is used for valid pointers (e.g. 0xffffff00 is a valid heap pointer in socfpga SPL). For such platforms, this value provides an upper range of those error pointer values - up to 'MAX_ERRNO' bytes below this value must be unused/invalid addresses. config PLATFORM_ELFENTRY string default "__start" if MIPS default "_start" config STACK_SIZE hex "Define max stack size that can be used by U-Boot" default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP default 0x200000 if MICROBLAZE default 0x1000000 help Define Max stack size that can be used by U-Boot. This value is used by the UEFI sub-system. On some boards initrd_high is calculated as base stack pointer minus this stack size. config SYS_MEM_TOP_HIDE hex "Exclude some memory from U-Boot / OS information" default 0x0 help If set, this specified memory area will get subtracted from the top (end) of RAM and won't get "touched" at all by U-Boot. By fixing up gd->ram_size the OS / next stage should gets passed the now "corrected" memory size and won't touch it either. WARNING: Please make sure that this value is a multiple of the OS page size. config SYS_HAS_SRAM bool default y if TARGET_PIC32MZDASK default y if TARGET_DEVKIT8000 default y if TARGET_TRICORDER help Enable this to allow support for the on board SRAM. SRAM base address is controlled by CONFIG_SYS_SRAM_BASE. SRAM size is controlled by CONFIG_SYS_SRAM_SIZE. config SYS_SRAM_BASE hex default 0x80000000 if TARGET_PIC32MZDASK default 0x40200000 if TARGET_DEVKIT8000 default 0x40200000 if TARGET_TRICORDER default 0x0 config SYS_SRAM_SIZE hex default 0x00080000 if TARGET_PIC32MZDASK default 0x10000 if TARGET_DEVKIT8000 default 0x10000 if TARGET_TRICORDER default 0x0 config MP bool "Support for multiprocessor" help This provides an option to bringup different processors in multiprocessor cases. config EXAMPLES bool "Compile API examples" depends on !SANDBOX default y if ARCH_QEMU help U-Boot provides an API for standalone applications. Examples are provided in directory examples/. endmenu # General setup source "api/Kconfig" source "boot/Kconfig" source "common/Kconfig" source "cmd/Kconfig" source "disk/Kconfig" source "dts/Kconfig" source "env/Kconfig" source "net/Kconfig" source "drivers/Kconfig" source "fs/Kconfig" source "lib/Kconfig" source "test/Kconfig" source "tools/Kconfig"