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"
180 Enabling this option will make U-Boot be run as a bootloader
181 for XEN [1] Virtual Machine.
183 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
184 for para-virtualization. Xen can organize the safe execution of several
185 virtual machines on the same physical system with performance close to
186 native. It is used as the basis for a number of different commercial and
187 open source applications, such as: server virtualization, Infrastructure
188 as a Service (IaaS), desktop virtualization, security applications,
189 embedded and hardware appliances.
190 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
191 Xen to use the device drivers for the Domain-0 kernel by default.
193 [1] - https://xenproject.org/
195 config ENV_VARS_UBOOT_CONFIG
196 bool "Add arch, board, vendor and soc variables to default environment"
198 Define this in order to add variables describing the
199 U-Boot build configuration to the default environment.
200 These will be named arch, cpu, board, vendor, and soc.
201 Enabling this option will cause the following to be defined:
209 int "Number of DRAM banks"
210 default 1 if ARCH_SUNXI || ARCH_OWL
213 This defines the number of DRAM banks.
215 config SYS_BOOT_GET_CMDLINE
216 bool "Enable kernel command line setup"
218 Enables allocating and saving kernel cmdline in space between
219 "bootm_low" and "bootm_low" + BOOTMAPSZ.
222 int "Size of kernel command line buffer in bytes"
223 depends on SYS_BOOT_GET_CMDLINE
226 Buffer size for Boot Arguments which are passed to the application
227 (usually a Linux kernel) when it is booted
229 config SYS_BOOT_GET_KBD
230 bool "Enable kernel board information setup"
232 Enables allocating and saving a kernel copy of the bd_info in
233 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
235 config HAS_CUSTOM_SYS_INIT_SP_ADDR
236 bool "Use a custom location for the initial stack pointer address"
237 depends on ARC || (ARM && !INIT_SP_RELATIVE) || MIPS || PPC || RISCV
240 Typically, we use an initial stack pointer address that is calculated
241 by taking the statically defined CFG_SYS_INIT_RAM_ADDR, adding the
242 statically defined CFG_SYS_INIT_RAM_SIZE and then subtracting the
243 build-time constant of GENERATED_GBL_DATA_SIZE. On MIPS a different
244 but statica calculation is performed. However, some platforms will
245 take a different approach. Say Y here to define the address statically
248 config CUSTOM_SYS_INIT_SP_ADDR
249 hex "Static location for the initial stack pointer"
250 depends on HAS_CUSTOM_SYS_INIT_SP_ADDR
251 default TEXT_BASE if TFABOOT
254 bool "Enable malloc() pool before relocation"
258 Before relocation, memory is very limited on many platforms. Still,
259 we can provide a small malloc() pool if needed. Driver model in
260 particular needs this to operate, so that it can allocate the
261 initial serial device and any others that are needed.
263 config SYS_MALLOC_F_LEN
264 hex "Size of malloc() pool before relocation"
265 depends on SYS_MALLOC_F
266 default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
267 ROCKCHIP_RK3308 || ROCKCHIP_RV1108
268 default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
269 default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
270 ROCKCHIP_RK322X || X86
271 default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
272 default 0x1800 if ARCH_TEGRA
273 default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
275 default 0x8000 if RCAR_GEN3
276 default 0x10000 if ARCH_IMX8 || ARCH_IMX8M
279 Before relocation, memory is very limited on many platforms. Still,
280 we can provide a small malloc() pool if needed. Driver model in
281 particular needs this to operate, so that it can allocate the
282 initial serial device and any others that are needed.
284 config SYS_MALLOC_LEN
285 hex "Define memory for Dynamic allocation"
286 default 0x4000000 if SANDBOX
287 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
288 default 0x200000 if ARCH_BMIPS || X86
289 default 0x4020000 if SUNXI_MINIMUM_DRAM_MB >= 256
290 default 0x220000 if SUNXI_MINIMUM_DRAM_MB >= 64
291 default 0x120000 if SUNXI_MINIMUM_DRAM_MB >= 32
294 This defines memory to be allocated for Dynamic allocation
295 TODO: Use for other architectures
297 config SPL_SYS_MALLOC_F_LEN
298 hex "Size of malloc() pool in SPL"
299 depends on SYS_MALLOC_F && SPL
300 default 0 if !SPL_FRAMEWORK
301 default 0x2800 if RCAR_GEN3
302 default 0x2000 if IMX8MQ
303 default SYS_MALLOC_F_LEN
305 In SPL 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.
310 It is possible to enable CFG_SYS_SPL_MALLOC_START to start a new
311 malloc() region in SDRAM once it is inited.
313 config TPL_SYS_MALLOC_F_LEN
314 hex "Size of malloc() pool in TPL"
315 depends on SYS_MALLOC_F && TPL
316 default SPL_SYS_MALLOC_F_LEN
318 In TPL memory is very limited on many platforms. Still,
319 we can provide a small malloc() pool if needed. Driver model in
320 particular needs this to operate, so that it can allocate the
321 initial serial device and any others that are needed.
324 bool "Inform valgrind about memory allocations"
327 Valgrind is an instrumentation framework for building dynamic analysis
328 tools. In particular, it may be used to detect memory management bugs
329 in U-Boot. It relies on knowing when heap blocks are allocated in
330 order to give accurate results. This happens automatically for
331 standard allocator functions provided by the host OS. However, this
332 doesn't automatically happen for U-Boot's malloc implementation.
334 Enable this option to annotate U-Boot's malloc implementation so that
335 it can be handled accurately by Valgrind. If you aren't planning on
336 using valgrind to debug U-Boot, say 'n'.
338 config VPL_SYS_MALLOC_F_LEN
339 hex "Size of malloc() pool in VPL before relocation"
340 depends on SYS_MALLOC_F && VPL
341 default SYS_MALLOC_F_LEN
343 Before relocation, memory is very limited on many platforms. Still,
344 we can provide a small malloc() pool if needed. Driver model in
345 particular needs this to operate, so that it can allocate the
346 initial serial device and any others that are needed.
349 bool "Configure standard U-Boot features (expert users)"
352 This option allows certain base U-Boot options and settings
353 to be disabled or tweaked. This is for specialized
354 environments which can tolerate a "non-standard" U-Boot.
355 Use this only if you really know what you are doing.
358 config SYS_MALLOC_CLEAR_ON_INIT
359 bool "Init with zeros the memory reserved for malloc (slow)"
362 This setting is enabled by default. The reserved malloc
363 memory is initialized with zeros, so first malloc calls
364 will return the pointer to the zeroed memory. But this
367 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
368 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
369 Then the boot time can be significantly reduced.
371 When disabling this, please check if malloc calls, maybe
372 should be replaced by calloc - if one expects zeroed memory.
374 config SYS_MALLOC_DEFAULT_TO_INIT
375 bool "Default malloc to init while reserving the memory for it"
377 It may happen that one needs to move the dynamic allocation
378 from one to another memory range, eg. when moving the malloc
379 from the limited static to a potentially large dynamic (DDR)
382 If so then on top of setting the updated memory aside one
383 needs to bring the malloc init.
385 If such a scenario is sought choose yes.
388 bool "Enable debug information for tools"
390 Enable generation of debug information for tools such as mkimage.
391 This can be used for debugging purposes. With debug information
392 it is possible to set breakpoints on particular lines, single-step
393 debug through the source code, etc.
398 bool "64bit physical address support"
400 Say Y here to support 64bit physical memory address.
401 This can be used not only for 64bit SoCs, but also for
402 large physical address extension on 32bit SoCs.
408 Enables building of a u-boot.rom target. This collects U-Boot and
409 any necessary binary blobs.
412 string "SPL image used in the combined SPL+U-Boot image"
413 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
414 default "spl/u-boot-spl.bin"
417 Select the SPL build target that shall be generated by the SPL
418 build process (default spl/u-boot-spl.bin). This image will be
419 used to generate a combined image with SPL and main U-Boot
420 proper as one single image.
423 bool "Recreate an ELF image from raw U-Boot binary"
425 Enable this to recreate an ELF image (u-boot.elf) from the raw
426 U-Boot binary (u-boot.bin), which may already have been statically
427 relocated and may already have a device-tree appended to it.
430 string "Build target special images"
431 default "u-boot-elf.srec" if RCAR_64
432 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
433 default "u-boot-with-spl.bin" if MPC85xx && !E500MC && !E5500 && !E6500 && SPL
434 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
435 default "u-boot-with-spl.kwb" if ARMADA_32BIT && SPL
436 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
437 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
438 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
439 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
440 default "u-boot.kwb" if (ARCH_KIRKWOOD || ARMADA_32BIT) && !SPL
442 Some SoCs need special image types (e.g. U-Boot binary
443 with a special header) as build targets. By defining
444 CONFIG_BUILD_TARGET in the SoC / board header, this
445 special image will be automatically built upon calling
448 config HAS_BOARD_SIZE_LIMIT
449 bool "Define a maximum size for the U-Boot image"
452 In some cases, we need to enforce a hard limit on how big the U-Boot
455 config BOARD_SIZE_LIMIT
456 int "Maximum size of the U-Boot image in bytes"
457 default 1048576 if RCAR_64
458 depends on HAS_BOARD_SIZE_LIMIT
460 Maximum size of the U-Boot image. When defined, the build system
461 checks that the actual size does not exceed it. This does not
462 include SPL nor TPL, on platforms that use that functionality, they
463 have a separate option to restict size.
465 config SYS_CUSTOM_LDSCRIPT
466 bool "Use a custom location for the U-Boot linker script"
468 Normally when linking U-Boot we will look in the board directory,
469 the CPU directory and finally the "cpu" directory of the architecture
470 for the ile "u-boot.lds" and use that as our linker. However, in
471 some cases we need to provide a different linker script. To do so,
472 enable this option and then provide the location under
476 depends on SYS_CUSTOM_LDSCRIPT
477 string "Custom ldscript location"
479 Path within the source tree to the linker script to use for the
483 hex "Address in memory to use by default"
484 default 0x01000000 if ARCH_SOCFPGA
485 default 0x02000000 if PPC || X86
486 default 0x81000000 if MACH_SUNIV
487 default 0x22000000 if MACH_SUN9I
488 default 0x42000000 if ARCH_SUNXI
489 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
490 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
491 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
492 default 0x80800000 if ARCH_MX7
493 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
495 Address in memory to use as the default safe load address.
497 config ERR_PTR_OFFSET
501 Some U-Boot pointers have redundant information, so we can use a
502 scheme where we can return either an error code or a pointer with the
503 same return value. The default implementation just casts the pointer
504 to a number, however, this may fail on platforms where the end of the
505 address range is used for valid pointers (e.g. 0xffffff00 is a valid
506 heap pointer in socfpga SPL).
507 For such platforms, this value provides an upper range of those error
508 pointer values - up to 'MAX_ERRNO' bytes below this value must be
509 unused/invalid addresses.
511 config PLATFORM_ELFENTRY
513 default "__start" if MIPS
517 hex "Define max stack size that can be used by U-Boot"
518 default 0x4000000 if ARCH_VERSAL_NET || ARCH_VERSAL || ARCH_ZYNQMP
519 default 0x200000 if MICROBLAZE
522 Define Max stack size that can be used by U-Boot. This value is used
523 by the UEFI sub-system. On some boards initrd_high is calculated as
524 base stack pointer minus this stack size.
526 config SYS_MEM_TOP_HIDE
527 hex "Exclude some memory from U-Boot / OS information"
530 If set, this specified memory area will get subtracted from the top
531 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
532 gd->ram_size the OS / next stage should gets passed the now
533 "corrected" memory size and won't touch it either.
534 WARNING: Please make sure that this value is a multiple of the OS
539 default y if TARGET_PIC32MZDASK
540 default y if TARGET_DEVKIT8000
541 default y if TARGET_TRICORDER
543 Enable this to allow support for the on board SRAM.
544 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
545 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
549 default 0x80000000 if TARGET_PIC32MZDASK
550 default 0x40200000 if TARGET_DEVKIT8000
551 default 0x40200000 if TARGET_TRICORDER
556 default 0x00080000 if TARGET_PIC32MZDASK
557 default 0x10000 if TARGET_DEVKIT8000
558 default 0x10000 if TARGET_TRICORDER
561 config SYS_MONITOR_LEN
562 int "Maximum size in bytes reserved for U-Boot in memory"
563 default 1048576 if X86
564 default 786432 if ARCH_SUNXI
567 Size of memory reserved for monitor code, used to determine
568 _at_compile_time_ (!) if the environment is embedded within the
569 U-Boot image, or in a separate flash sector, among other uses where
570 we need to set a maximum size of the U-Boot binary itself that will
574 bool "Support for multiprocessor"
576 This provides an option to bringup different processors
577 in multiprocessor cases.
579 endmenu # General setup
583 source "boot/Kconfig"
585 source "common/Kconfig"
589 source "disk/Kconfig"
597 source "drivers/Kconfig"
603 source "test/Kconfig"
605 source "tools/Kconfig"