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.
6 mainmenu "U-Boot $(UBOOTVERSION) Configuration"
8 comment "Compiler: $(CC_VERSION_TEXT)"
10 source "scripts/Kconfig.include"
12 # Allow defaults in arch-specific code to override any given here
20 This option cannot be enabled. It is used as dependency
21 for broken and incomplete features.
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"
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.
40 config LOCALVERSION_AUTO
41 bool "Automatically append version information to the version string"
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
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".)
61 def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
65 default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
69 def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
73 default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
76 prompt "Optimization level"
77 default CC_OPTIMIZE_FOR_SIZE
79 config CC_OPTIMIZE_FOR_SIZE
80 bool "Optimize for size"
82 Enabling this option will pass "-Os" to gcc, resulting in a smaller
85 This option is enabled by default for U-Boot.
87 config CC_OPTIMIZE_FOR_SPEED
88 bool "Optimize for speed"
90 Enabling this option will pass "-O2" to gcc, resulting in a faster
93 config CC_OPTIMIZE_FOR_DEBUG
94 bool "Optimize for debugging"
96 Enabling this option will pass "-Og" to gcc, enabling optimizations
97 which don't interfere with debugging.
101 config OPTIMIZE_INLINING
102 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
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
109 config SPL_OPTIMIZE_INLINING
110 bool "Allow compiler to uninline functions marked 'inline' in SPL"
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
118 config ARCH_SUPPORTS_LTO
122 bool "Enable Link Time Optimizations"
123 depends on ARCH_SUPPORTS_LTO
125 This option enables Link Time Optimization (LTO), a mechanism which
126 allows the compiler to optimize between different compilation units.
128 This can optimize away dead code paths, resulting in smaller binary
129 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
131 This option is not available for every architecture and may
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
141 config TPL_OPTIMIZE_INLINING
142 bool "Allow compiler to uninline functions marked 'inline' in TPL"
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
151 bool "Enable code coverage analysis"
154 Enabling this option will pass "--coverage" to gcc to compile
155 and link code instrumented for coverage analysis.
158 bool "Enable AddressSanitizer"
161 Enables AddressSanitizer to discover out-of-bounds accesses,
162 use-after-free, double-free and memory leaks.
165 bool "Enable fuzzing"
166 depends on CC_IS_CLANG
167 depends on DM_FUZZING_ENGINE
170 Enables the fuzzing infrastructure to generate fuzzing data and run
173 config CC_HAS_ASM_INLINE
174 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
177 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
179 Enabling this option will make U-Boot be run as a bootloader
180 for XEN [1] Virtual Machine.
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.
192 [1] - https://xenproject.org/
194 config ENV_VARS_UBOOT_CONFIG
195 bool "Add arch, board, vendor and soc variables to default environment"
197 Define this in order to add variables describing the
198 U-Boot build configuration to the default environment.
199 These will be named arch, cpu, board, vendor, and soc.
200 Enabling this option will cause the following to be defined:
208 int "Number of DRAM banks"
209 default 1 if ARCH_SUNXI || ARCH_OWL
212 This defines the number of DRAM banks.
214 config SYS_BOOT_GET_CMDLINE
215 bool "Enable kernel command line setup"
217 Enables allocating and saving kernel cmdline in space between
218 "bootm_low" and "bootm_low" + BOOTMAPSZ.
221 int "Size of kernel command line buffer in bytes"
222 depends on SYS_BOOT_GET_CMDLINE
225 Buffer size for Boot Arguments which are passed to the application
226 (usually a Linux kernel) when it is booted
228 config SYS_BOOT_GET_KBD
229 bool "Enable kernel board information setup"
231 Enables allocating and saving a kernel copy of the bd_info in
232 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
234 config HAS_CUSTOM_SYS_INIT_SP_ADDR
235 bool "Use a custom location for the initial stack pointer address"
236 depends on ARC || (ARM && !INIT_SP_RELATIVE) || MIPS || PPC || RISCV
239 Typically, we use an initial stack pointer address that is calculated
240 by taking the statically defined CFG_SYS_INIT_RAM_ADDR, adding the
241 statically defined CFG_SYS_INIT_RAM_SIZE and then subtracting the
242 build-time constant of GENERATED_GBL_DATA_SIZE. On MIPS a different
243 but statica calculation is performed. However, some platforms will
244 take a different approach. Say Y here to define the address statically
247 config CUSTOM_SYS_INIT_SP_ADDR
248 hex "Static location for the initial stack pointer"
249 depends on HAS_CUSTOM_SYS_INIT_SP_ADDR
250 default TEXT_BASE if TFABOOT
253 bool "Enable malloc() pool before relocation"
257 Before relocation, memory is very limited on many platforms. Still,
258 we can provide a small malloc() pool if needed. Driver model in
259 particular needs this to operate, so that it can allocate the
260 initial serial device and any others that are needed.
262 config SYS_MALLOC_F_LEN
263 hex "Size of malloc() pool before relocation"
264 depends on SYS_MALLOC_F
265 default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
266 ROCKCHIP_RK3308 || ROCKCHIP_RV1108
267 default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
268 default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
269 ROCKCHIP_RK322X || X86
270 default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
271 default 0x1800 if ARCH_TEGRA
272 default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
274 default 0x8000 if RCAR_GEN3
275 default 0x10000 if ARCH_IMX8 || ARCH_IMX8M
278 Before relocation, memory is very limited on many platforms. Still,
279 we can provide a small malloc() pool if needed. Driver model in
280 particular needs this to operate, so that it can allocate the
281 initial serial device and any others that are needed.
283 config SYS_MALLOC_LEN
284 hex "Define memory for Dynamic allocation"
285 default 0x4000000 if SANDBOX
286 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
287 default 0x200000 if ARCH_BMIPS || X86
288 default 0x4020000 if SUNXI_MINIMUM_DRAM_MB >= 256
289 default 0x220000 if SUNXI_MINIMUM_DRAM_MB >= 64
290 default 0x120000 if SUNXI_MINIMUM_DRAM_MB >= 32
293 This defines memory to be allocated for Dynamic allocation
294 TODO: Use for other architectures
296 config SPL_SYS_MALLOC_F_LEN
297 hex "Size of malloc() pool in SPL"
298 depends on SYS_MALLOC_F && SPL
299 default 0 if !SPL_FRAMEWORK
300 default 0x2800 if RCAR_GEN3
301 default 0x2000 if IMX8MQ
302 default SYS_MALLOC_F_LEN
304 In SPL memory is very limited on many platforms. Still,
305 we can provide a small malloc() pool if needed. Driver model in
306 particular needs this to operate, so that it can allocate the
307 initial serial device and any others that are needed.
309 It is possible to enable CFG_SYS_SPL_MALLOC_START to start a new
310 malloc() region in SDRAM once it is inited.
312 config TPL_SYS_MALLOC_F_LEN
313 hex "Size of malloc() pool in TPL"
314 depends on SYS_MALLOC_F && TPL
315 default SPL_SYS_MALLOC_F_LEN
317 In TPL memory is very limited on many platforms. Still,
318 we can provide a small malloc() pool if needed. Driver model in
319 particular needs this to operate, so that it can allocate the
320 initial serial device and any others that are needed.
323 bool "Inform valgrind about memory allocations"
326 Valgrind is an instrumentation framework for building dynamic analysis
327 tools. In particular, it may be used to detect memory management bugs
328 in U-Boot. It relies on knowing when heap blocks are allocated in
329 order to give accurate results. This happens automatically for
330 standard allocator functions provided by the host OS. However, this
331 doesn't automatically happen for U-Boot's malloc implementation.
333 Enable this option to annotate U-Boot's malloc implementation so that
334 it can be handled accurately by Valgrind. If you aren't planning on
335 using valgrind to debug U-Boot, say 'n'.
337 config VPL_SYS_MALLOC_F_LEN
338 hex "Size of malloc() pool in VPL before relocation"
339 depends on SYS_MALLOC_F && VPL
340 default SYS_MALLOC_F_LEN
342 Before relocation, memory is very limited on many platforms. Still,
343 we can provide a small malloc() pool if needed. Driver model in
344 particular needs this to operate, so that it can allocate the
345 initial serial device and any others that are needed.
348 bool "Configure standard U-Boot features (expert users)"
351 This option allows certain base U-Boot options and settings
352 to be disabled or tweaked. This is for specialized
353 environments which can tolerate a "non-standard" U-Boot.
354 Use this only if you really know what you are doing.
357 config SYS_MALLOC_CLEAR_ON_INIT
358 bool "Init with zeros the memory reserved for malloc (slow)"
361 This setting is enabled by default. The reserved malloc
362 memory is initialized with zeros, so first malloc calls
363 will return the pointer to the zeroed memory. But this
366 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
367 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
368 Then the boot time can be significantly reduced.
370 When disabling this, please check if malloc calls, maybe
371 should be replaced by calloc - if one expects zeroed memory.
373 config SYS_MALLOC_DEFAULT_TO_INIT
374 bool "Default malloc to init while reserving the memory for it"
376 It may happen that one needs to move the dynamic allocation
377 from one to another memory range, eg. when moving the malloc
378 from the limited static to a potentially large dynamic (DDR)
381 If so then on top of setting the updated memory aside one
382 needs to bring the malloc init.
384 If such a scenario is sought choose yes.
387 bool "Enable debug information for tools"
389 Enable generation of debug information for tools such as mkimage.
390 This can be used for debugging purposes. With debug information
391 it is possible to set breakpoints on particular lines, single-step
392 debug through the source code, etc.
397 bool "64bit physical address support"
399 Say Y here to support 64bit physical memory address.
400 This can be used not only for 64bit SoCs, but also for
401 large physical address extension on 32bit SoCs.
407 Enables building of a u-boot.rom target. This collects U-Boot and
408 any necessary binary blobs.
411 string "SPL image used in the combined SPL+U-Boot image"
412 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
413 default "spl/u-boot-spl.bin"
416 Select the SPL build target that shall be generated by the SPL
417 build process (default spl/u-boot-spl.bin). This image will be
418 used to generate a combined image with SPL and main U-Boot
419 proper as one single image.
422 bool "Recreate an ELF image from raw U-Boot binary"
424 Enable this to recreate an ELF image (u-boot.elf) from the raw
425 U-Boot binary (u-boot.bin), which may already have been statically
426 relocated and may already have a device-tree appended to it.
429 string "Build target special images"
430 default "u-boot-elf.srec" if RCAR_64
431 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
432 default "u-boot-with-spl.bin" if MPC85xx && !E500MC && !E5500 && !E6500 && SPL
433 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
434 default "u-boot-with-spl.kwb" if ARMADA_32BIT && SPL
435 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
436 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
437 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
438 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
439 default "u-boot.kwb" if (ARCH_KIRKWOOD || ARMADA_32BIT) && !SPL
441 Some SoCs need special image types (e.g. U-Boot binary
442 with a special header) as build targets. By defining
443 CONFIG_BUILD_TARGET in the SoC / board header, this
444 special image will be automatically built upon calling
447 config HAS_BOARD_SIZE_LIMIT
448 bool "Define a maximum size for the U-Boot image"
451 In some cases, we need to enforce a hard limit on how big the U-Boot
454 config BOARD_SIZE_LIMIT
455 int "Maximum size of the U-Boot image in bytes"
456 default 1048576 if RCAR_64
457 depends on HAS_BOARD_SIZE_LIMIT
459 Maximum size of the U-Boot image. When defined, the build system
460 checks that the actual size does not exceed it. This does not
461 include SPL nor TPL, on platforms that use that functionality, they
462 have a separate option to restict size.
464 config SYS_CUSTOM_LDSCRIPT
465 bool "Use a custom location for the U-Boot linker script"
467 Normally when linking U-Boot we will look in the board directory,
468 the CPU directory and finally the "cpu" directory of the architecture
469 for the ile "u-boot.lds" and use that as our linker. However, in
470 some cases we need to provide a different linker script. To do so,
471 enable this option and then provide the location under
475 depends on SYS_CUSTOM_LDSCRIPT
476 string "Custom ldscript location"
478 Path within the source tree to the linker script to use for the
482 hex "Address in memory to use by default"
483 default 0x01000000 if ARCH_SOCFPGA
484 default 0x02000000 if PPC || X86
485 default 0x81000000 if MACH_SUNIV
486 default 0x22000000 if MACH_SUN9I
487 default 0x42000000 if ARCH_SUNXI
488 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
489 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
490 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
491 default 0x80800000 if ARCH_MX7
492 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
494 Address in memory to use as the default safe load address.
496 config ERR_PTR_OFFSET
500 Some U-Boot pointers have redundant information, so we can use a
501 scheme where we can return either an error code or a pointer with the
502 same return value. The default implementation just casts the pointer
503 to a number, however, this may fail on platforms where the end of the
504 address range is used for valid pointers (e.g. 0xffffff00 is a valid
505 heap pointer in socfpga SPL).
506 For such platforms, this value provides an upper range of those error
507 pointer values - up to 'MAX_ERRNO' bytes below this value must be
508 unused/invalid addresses.
510 config PLATFORM_ELFENTRY
512 default "__start" if MIPS
516 hex "Define max stack size that can be used by U-Boot"
517 default 0x4000000 if ARCH_VERSAL_NET || ARCH_VERSAL || ARCH_ZYNQMP
518 default 0x200000 if MICROBLAZE
521 Define Max stack size that can be used by U-Boot. This value is used
522 by the UEFI sub-system. On some boards initrd_high is calculated as
523 base stack pointer minus this stack size.
525 config SYS_MEM_TOP_HIDE
526 hex "Exclude some memory from U-Boot / OS information"
529 If set, this specified memory area will get subtracted from the top
530 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
531 gd->ram_size the OS / next stage should gets passed the now
532 "corrected" memory size and won't touch it either.
533 WARNING: Please make sure that this value is a multiple of the OS
538 default y if TARGET_PIC32MZDASK
539 default y if TARGET_DEVKIT8000
540 default y if TARGET_TRICORDER
542 Enable this to allow support for the on board SRAM.
543 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
544 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
548 default 0x80000000 if TARGET_PIC32MZDASK
549 default 0x40200000 if TARGET_DEVKIT8000
550 default 0x40200000 if TARGET_TRICORDER
555 default 0x00080000 if TARGET_PIC32MZDASK
556 default 0x10000 if TARGET_DEVKIT8000
557 default 0x10000 if TARGET_TRICORDER
560 config SYS_MONITOR_LEN
561 int "Maximum size in bytes reserved for U-Boot in memory"
562 default 1048576 if X86
563 default 786432 if ARCH_SUNXI
566 Size of memory reserved for monitor code, used to determine
567 _at_compile_time_ (!) if the environment is embedded within the
568 U-Boot image, or in a separate flash sector, among other uses where
569 we need to set a maximum size of the U-Boot binary itself that will
573 bool "Support for multiprocessor"
575 This provides an option to bringup different processors
576 in multiprocessor cases.
578 endmenu # General setup
582 source "boot/Kconfig"
584 source "common/Kconfig"
588 source "disk/Kconfig"
596 source "drivers/Kconfig"
602 source "test/Kconfig"
604 source "tools/Kconfig"