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.
157 config CC_HAS_ASM_INLINE
158 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
161 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
163 Enabling this option will make U-Boot be run as a bootloader
164 for XEN [1] Virtual Machine.
166 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
167 for para-virtualization. Xen can organize the safe execution of several
168 virtual machines on the same physical system with performance close to
169 native. It is used as the basis for a number of different commercial and
170 open source applications, such as: server virtualization, Infrastructure
171 as a Service (IaaS), desktop virtualization, security applications,
172 embedded and hardware appliances.
173 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
174 Xen to use the device drivers for the Domain-0 kernel by default.
176 [1] - https://xenproject.org/
178 config DISTRO_DEFAULTS
179 bool "Select defaults suitable for booting general purpose Linux distributions"
181 select CMDLINE_EDITING
182 select CMD_BOOTI if ARM64
183 select CMD_BOOTZ if ARM && !ARM64
184 select CMD_DHCP if CMD_NET
185 select CMD_ENV_EXISTS
189 select CMD_FS_GENERIC
190 select CMD_PART if PARTITIONS
191 select CMD_PING if CMD_NET
192 select CMD_PXE if NET
194 select ENV_VARS_UBOOT_CONFIG
196 select SUPPORT_RAW_INITRD
200 imply USE_BOOTCOMMAND
202 Select this to enable various options and commands which are suitable
203 for building u-boot for booting general purpose Linux distributions.
205 config ENV_VARS_UBOOT_CONFIG
206 bool "Add arch, board, vendor and soc variables to default environment"
208 Define this in order to add variables describing the
209 U-Boot build configuration to the default environment.
210 These will be named arch, cpu, board, vendor, and soc.
211 Enabling this option will cause the following to be defined:
219 int "Number of DRAM banks"
220 default 1 if ARCH_SUNXI || ARCH_OWL
223 This defines the number of DRAM banks.
225 config SYS_BOOT_GET_CMDLINE
226 bool "Enable kernel command line setup"
228 Enables allocating and saving kernel cmdline in space between
229 "bootm_low" and "bootm_low" + BOOTMAPSZ.
232 int "Size of kernel command line buffer in bytes"
233 depends on SYS_BOOT_GET_CMDLINE
236 Buffer size for Boot Arguments which are passed to the application
237 (usually a Linux kernel) when it is booted
239 config SYS_BOOT_GET_KBD
240 bool "Enable kernel board information setup"
242 Enables allocating and saving a kernel copy of the bd_info in
243 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
245 config HAS_CUSTOM_SYS_INIT_SP_ADDR
246 bool "Use a custom location for the initial stack pointer address"
247 depends on ARC || (ARM && !INIT_SP_RELATIVE) || MIPS || PPC || RISCV
250 Typically, we use an initial stack pointer address that is calculated
251 by taking the statically defined CONFIG_SYS_INIT_RAM_ADDR, adding the
252 statically defined CONFIG_SYS_INIT_RAM_SIZE and then subtracting the
253 build-time constant of GENERATED_GBL_DATA_SIZE. On MIPS a different
254 but statica calculation is performed. However, some platforms will
255 take a different approach. Say Y here to define the address statically
258 config CUSTOM_SYS_INIT_SP_ADDR
259 hex "Static location for the initial stack pointer"
260 depends on HAS_CUSTOM_SYS_INIT_SP_ADDR
261 default SYS_TEXT_BASE if TFABOOT
264 bool "Enable malloc() pool before relocation"
268 Before relocation, memory is very limited on many platforms. Still,
269 we can provide a small malloc() pool if needed. Driver model in
270 particular needs this to operate, so that it can allocate the
271 initial serial device and any others that are needed.
273 config SYS_MALLOC_F_LEN
274 hex "Size of malloc() pool before relocation"
275 depends on SYS_MALLOC_F
276 default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
277 ROCKCHIP_RK3308 || ROCKCHIP_RV1108
278 default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
279 default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
280 ROCKCHIP_RK322X || X86
281 default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
282 default 0x1800 if ARCH_TEGRA
283 default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
285 default 0x8000 if RCAR_GEN3
286 default 0x10000 if ARCH_IMX8 || (ARCH_IMX8M && !IMX8MQ)
289 Before relocation, memory is very limited on many platforms. Still,
290 we can provide a small malloc() pool if needed. Driver model in
291 particular needs this to operate, so that it can allocate the
292 initial serial device and any others that are needed.
294 config SYS_MALLOC_LEN
295 hex "Define memory for Dynamic allocation"
296 default 0x4000000 if SANDBOX
297 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
298 default 0x200000 if ARCH_BMIPS || X86
299 default 0x120000 if MACH_SUNIV
300 default 0x220000 if MACH_SUN8I_V3S
301 default 0x4020000 if ARCH_SUNXI
304 This defines memory to be allocated for Dynamic allocation
305 TODO: Use for other architectures
307 config SPL_SYS_MALLOC_F_LEN
308 hex "Size of malloc() pool in SPL"
309 depends on SYS_MALLOC_F && SPL
310 default 0 if !SPL_FRAMEWORK
311 default 0x2800 if RCAR_GEN3
312 default SYS_MALLOC_F_LEN
314 In SPL memory is very limited on many platforms. Still,
315 we can provide a small malloc() pool if needed. Driver model in
316 particular needs this to operate, so that it can allocate the
317 initial serial device and any others that are needed.
319 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
320 malloc() region in SDRAM once it is inited.
322 config TPL_SYS_MALLOC_F_LEN
323 hex "Size of malloc() pool in TPL"
324 depends on SYS_MALLOC_F && TPL
325 default SPL_SYS_MALLOC_F_LEN
327 In TPL memory is very limited on many platforms. Still,
328 we can provide a small malloc() pool if needed. Driver model in
329 particular needs this to operate, so that it can allocate the
330 initial serial device and any others that are needed.
333 bool "Inform valgrind about memory allocations"
336 Valgrind is an instrumentation framework for building dynamic analysis
337 tools. In particular, it may be used to detect memory management bugs
338 in U-Boot. It relies on knowing when heap blocks are allocated in
339 order to give accurate results. This happens automatically for
340 standard allocator functions provided by the host OS. However, this
341 doesn't automatically happen for U-Boot's malloc implementation.
343 Enable this option to annotate U-Boot's malloc implementation so that
344 it can be handled accurately by Valgrind. If you aren't planning on
345 using valgrind to debug U-Boot, say 'n'.
347 config VPL_SYS_MALLOC_F_LEN
348 hex "Size of malloc() pool in VPL before relocation"
349 depends on SYS_MALLOC_F && VPL
350 default SYS_MALLOC_F_LEN
352 Before relocation, memory is very limited on many platforms. Still,
353 we can provide a small malloc() pool if needed. Driver model in
354 particular needs this to operate, so that it can allocate the
355 initial serial device and any others that are needed.
358 bool "Configure standard U-Boot features (expert users)"
361 This option allows certain base U-Boot options and settings
362 to be disabled or tweaked. This is for specialized
363 environments which can tolerate a "non-standard" U-Boot.
364 Use this only if you really know what you are doing.
367 config SYS_MALLOC_CLEAR_ON_INIT
368 bool "Init with zeros the memory reserved for malloc (slow)"
371 This setting is enabled by default. The reserved malloc
372 memory is initialized with zeros, so first malloc calls
373 will return the pointer to the zeroed memory. But this
376 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
377 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
378 Then the boot time can be significantly reduced.
380 When disabling this, please check if malloc calls, maybe
381 should be replaced by calloc - if one expects zeroed memory.
383 config SYS_MALLOC_DEFAULT_TO_INIT
384 bool "Default malloc to init while reserving the memory for it"
386 It may happen that one needs to move the dynamic allocation
387 from one to another memory range, eg. when moving the malloc
388 from the limited static to a potentially large dynamic (DDR)
391 If so then on top of setting the updated memory aside one
392 needs to bring the malloc init.
394 If such a scenario is sought choose yes.
397 bool "Enable debug information for tools"
399 Enable generation of debug information for tools such as mkimage.
400 This can be used for debugging purposes. With debug information
401 it is possible to set breakpoints on particular lines, single-step
402 debug through the source code, etc.
407 bool "64bit physical address support"
409 Say Y here to support 64bit physical memory address.
410 This can be used not only for 64bit SoCs, but also for
411 large physical address extension on 32bit SoCs.
417 Enables building of a u-boot.rom target. This collects U-Boot and
418 any necessary binary blobs.
421 string "SPL image used in the combined SPL+U-Boot image"
422 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
423 default "spl/u-boot-spl.bin"
426 Select the SPL build target that shall be generated by the SPL
427 build process (default spl/u-boot-spl.bin). This image will be
428 used to generate a combined image with SPL and main U-Boot
429 proper as one single image.
432 bool "Recreate an ELF image from raw U-Boot binary"
434 Enable this to recreate an ELF image (u-boot.elf) from the raw
435 U-Boot binary (u-boot.bin), which may already have been statically
436 relocated and may already have a device-tree appended to it.
439 string "Build target special images"
440 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
441 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
442 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
443 default "u-boot-elf.srec" if RCAR_GEN3
444 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
445 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
446 default "u-boot.kwb" if ARCH_KIRKWOOD
447 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
448 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
450 Some SoCs need special image types (e.g. U-Boot binary
451 with a special header) as build targets. By defining
452 CONFIG_BUILD_TARGET in the SoC / board header, this
453 special image will be automatically built upon calling
456 config HAS_BOARD_SIZE_LIMIT
457 bool "Define a maximum size for the U-Boot image"
458 default y if RCAR_GEN3
460 In some cases, we need to enforce a hard limit on how big the U-Boot
463 config BOARD_SIZE_LIMIT
464 int "Maximum size of the U-Boot image in bytes"
465 default 1048576 if RCAR_GEN3
466 depends on HAS_BOARD_SIZE_LIMIT
468 Maximum size of the U-Boot image. When defined, the build system
469 checks that the actual size does not exceed it. This does not
470 include SPL nor TPL, on platforms that use that functionality, they
471 have a separate option to restict size.
473 config SYS_CUSTOM_LDSCRIPT
474 bool "Use a custom location for the U-Boot linker script"
476 Normally when linking U-Boot we will look in the board directory,
477 the CPU directory and finally the "cpu" directory of the architecture
478 for the ile "u-boot.lds" and use that as our linker. However, in
479 some cases we need to provide a different linker script. To do so,
480 enable this option and then provide the location under
484 depends on SYS_CUSTOM_LDSCRIPT
485 string "Custom ldscript location"
487 Path within the source tree to the linker script to use for the
491 hex "Address in memory to use by default"
492 default 0x01000000 if ARCH_SOCFPGA
493 default 0x02000000 if PPC || X86
494 default 0x81000000 if MACH_SUNIV
495 default 0x22000000 if MACH_SUN9I
496 default 0x42000000 if ARCH_SUNXI
497 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
498 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
499 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
500 default 0x80800000 if ARCH_MX7
501 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
503 Address in memory to use as the default safe load address.
505 config ERR_PTR_OFFSET
509 Some U-Boot pointers have redundant information, so we can use a
510 scheme where we can return either an error code or a pointer with the
511 same return value. The default implementation just casts the pointer
512 to a number, however, this may fail on platforms where the end of the
513 address range is used for valid pointers (e.g. 0xffffff00 is a valid
514 heap pointer in socfpga SPL).
515 For such platforms, this value provides an upper range of those error
516 pointer values - up to 'MAX_ERRNO' bytes below this value must be
517 unused/invalid addresses.
519 config PLATFORM_ELFENTRY
521 default "__start" if MIPS
525 hex "Define max stack size that can be used by U-Boot"
526 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
527 default 0x200000 if MICROBLAZE
530 Define Max stack size that can be used by U-Boot. This value is used
531 by the UEFI sub-system. On some boards initrd_high is calculated as
532 base stack pointer minus this stack size.
534 config SYS_MEM_TOP_HIDE
535 hex "Exclude some memory from U-Boot / OS information"
538 If set, this specified memory area will get subtracted from the top
539 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
540 gd->ram_size the OS / next stage should gets passed the now
541 "corrected" memory size and won't touch it either.
542 WARNING: Please make sure that this value is a multiple of the OS
547 default y if TARGET_PIC32MZDASK
548 default y if TARGET_DEVKIT8000
549 default y if TARGET_TRICORDER
551 Enable this to allow support for the on board SRAM.
552 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
553 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
557 default 0x80000000 if TARGET_PIC32MZDASK
558 default 0x40200000 if TARGET_DEVKIT8000
559 default 0x40200000 if TARGET_TRICORDER
564 default 0x00080000 if TARGET_PIC32MZDASK
565 default 0x10000 if TARGET_DEVKIT8000
566 default 0x10000 if TARGET_TRICORDER
570 bool "Support for multiprocessor"
572 This provides an option to bringup different processors
573 in multiprocessor cases.
576 bool "Compile API examples"
578 default y if ARCH_QEMU
580 U-Boot provides an API for standalone applications. Examples are
581 provided in directory examples/.
583 endmenu # General setup
587 source "boot/Kconfig"
589 source "common/Kconfig"
593 source "disk/Kconfig"
601 source "drivers/Kconfig"
607 source "test/Kconfig"
609 source "tools/Kconfig"