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 source "scripts/Kconfig.include"
10 # Allow defaults in arch-specific code to override any given here
18 This option cannot be enabled. It is used as dependency
19 for broken and incomplete features.
24 This option cannot be enabled. It it used as a dependency for
25 code that relies on deprecated features that will be removed and
26 the conversion deadline has passed.
29 string "Local version - append to U-Boot release"
31 Append an extra string to the end of your U-Boot version.
32 This will show up in your boot log, for example.
33 The string you set here will be appended after the contents of
34 any files with a filename matching localversion* in your
35 object and source tree, in that order. Your total string can
36 be a maximum of 64 characters.
38 config LOCALVERSION_AUTO
39 bool "Automatically append version information to the version string"
42 This will try to automatically determine if the current tree is a
43 release tree by looking for Git tags that belong to the current
46 A string of the format -gxxxxxxxx will be added to the localversion
47 if a Git-based tree is found. The string generated by this will be
48 appended after any matching localversion* files, and after the value
49 set in CONFIG_LOCALVERSION.
51 (The actual string used here is the first eight characters produced
52 by running the command:
54 $ git rev-parse --verify HEAD
56 which is done within the script "scripts/setlocalversion".)
58 config CC_OPTIMIZE_FOR_SIZE
59 bool "Optimize for size"
62 Enabling this option will pass "-Os" instead of "-O2" to gcc
63 resulting in a smaller U-Boot image.
65 This option is enabled by default for U-Boot.
67 config OPTIMIZE_INLINING
68 bool "Allow compiler to uninline functions marked 'inline'"
71 This option determines if U-Boot forces gcc to inline the functions
72 developers have marked 'inline'. Doing so takes away freedom from gcc to
73 do what it thinks is best, which is desirable in some cases for size
77 bool "Enable code coverage analysis"
80 Enabling this option will pass "--coverage" to gcc to compile
81 and link code instrumented for coverage analysis.
83 config CC_HAS_ASM_INLINE
84 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
86 config DISTRO_DEFAULTS
87 bool "Select defaults suitable for booting general purpose Linux distributions"
89 select CMDLINE_EDITING
90 select CMD_BOOTI if ARM64
91 select CMD_BOOTZ if ARM && !ARM64
92 select CMD_DHCP if CMD_NET
98 select CMD_PART if PARTITIONS
99 select CMD_PING if CMD_NET
100 select CMD_PXE if NET
102 select ENV_VARS_UBOOT_CONFIG
104 select SUPPORT_RAW_INITRD
108 imply USE_BOOTCOMMAND
110 Select this to enable various options and commands which are suitable
111 for building u-boot for booting general purpose Linux distributions.
113 config ENV_VARS_UBOOT_CONFIG
114 bool "Add arch, board, vendor and soc variables to default environment"
116 Define this in order to add variables describing the
117 U-Boot build configuration to the default environment.
118 These will be named arch, cpu, board, vendor, and soc.
119 Enabling this option will cause the following to be defined:
127 int "Number of DRAM banks"
128 default 1 if ARCH_SUNXI || ARCH_OWL
131 This defines the number of DRAM banks.
133 config SYS_BOOT_GET_CMDLINE
134 bool "Enable kernel command line setup"
136 Enables allocating and saving kernel cmdline in space between
137 "bootm_low" and "bootm_low" + BOOTMAPSZ.
139 config SYS_BOOT_GET_KBD
140 bool "Enable kernel board information setup"
142 Enables allocating and saving a kernel copy of the bd_info in
143 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
146 bool "Enable malloc() pool before relocation"
150 Before relocation, memory is very limited on many platforms. Still,
151 we can provide a small malloc() pool if needed. Driver model in
152 particular needs this to operate, so that it can allocate the
153 initial serial device and any others that are needed.
155 config SYS_MALLOC_F_LEN
156 hex "Size of malloc() pool before relocation"
157 depends on SYS_MALLOC_F
158 default 0x1000 if AM33XX
159 default 0x2800 if SANDBOX
160 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
161 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
162 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
163 ARCH_LS1046A || ARCH_QEMU)
166 Before relocation, memory is very limited on many platforms. Still,
167 we can provide a small malloc() pool if needed. Driver model in
168 particular needs this to operate, so that it can allocate the
169 initial serial device and any others that are needed.
171 config SYS_MALLOC_LEN
172 hex "Define memory for Dynamic allocation"
173 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
174 default 0x2000000 if ARCH_ROCKCHIP
176 This defines memory to be allocated for Dynamic allocation
177 TODO: Use for other architectures
179 config SPL_SYS_MALLOC_F_LEN
180 hex "Size of malloc() pool in SPL before relocation"
181 depends on SYS_MALLOC_F && SPL
182 default 0x2800 if RCAR_GEN3
183 default SYS_MALLOC_F_LEN
185 Before relocation, memory is very limited on many platforms. Still,
186 we can provide a small malloc() pool if needed. Driver model in
187 particular needs this to operate, so that it can allocate the
188 initial serial device and any others that are needed.
190 config TPL_SYS_MALLOC_F_LEN
191 hex "Size of malloc() pool in TPL before relocation"
192 depends on SYS_MALLOC_F && TPL
193 default SYS_MALLOC_F_LEN
195 Before relocation, memory is very limited on many platforms. Still,
196 we can provide a small malloc() pool if needed. Driver model in
197 particular needs this to operate, so that it can allocate the
198 initial serial device and any others that are needed.
201 bool "Configure standard U-Boot features (expert users)"
204 This option allows certain base U-Boot options and settings
205 to be disabled or tweaked. This is for specialized
206 environments which can tolerate a "non-standard" U-Boot.
207 Use this only if you really know what you are doing.
210 config SYS_MALLOC_CLEAR_ON_INIT
211 bool "Init with zeros the memory reserved for malloc (slow)"
214 This setting is enabled by default. The reserved malloc
215 memory is initialized with zeros, so first malloc calls
216 will return the pointer to the zeroed memory. But this
219 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
220 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
221 Then the boot time can be significantly reduced.
223 When disabling this, please check if malloc calls, maybe
224 should be replaced by calloc - if one expects zeroed memory.
226 config SYS_MALLOC_DEFAULT_TO_INIT
227 bool "Default malloc to init while reserving the memory for it"
230 It may happen that one needs to move the dynamic allocation
231 from one to another memory range, eg. when moving the malloc
232 from the limited static to a potentially large dynamic (DDR)
235 If so then on top of setting the updated memory aside one
236 needs to bring the malloc init.
238 If such a scenario is sought choose yes.
241 bool "Enable debug information for tools"
243 Enable generation of debug information for tools such as mkimage.
244 This can be used for debugging purposes. With debug information
245 it is possible to set breakpoints on particular lines, single-step
246 debug through the source code, etc.
251 bool "64bit physical address support"
253 Say Y here to support 64bit physical memory address.
254 This can be used not only for 64bit SoCs, but also for
255 large physical address extension on 32bit SoCs.
258 bool "Build U-Boot as BIOS replacement"
261 This option allows to build a ROM version of U-Boot.
262 The build process generally requires several binary blobs
263 which are not shipped in the U-Boot source tree.
264 Please, see doc/arch/x86.rst for details.
267 string "SPL image used in the combined SPL+U-Boot image"
268 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
269 default "spl/u-boot-spl.bin"
272 Select the SPL build target that shall be generated by the SPL
273 build process (default spl/u-boot-spl.bin). This image will be
274 used to generate a combined image with SPL and main U-Boot
275 proper as one single image.
278 string "Build target special images"
279 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
280 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
281 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
282 default "u-boot-elf.srec" if RCAR_GEN3
283 default "u-boot.itb" if SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
284 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
285 default "u-boot.kwb" if ARCH_KIRKWOOD
286 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
287 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
289 Some SoCs need special image types (e.g. U-Boot binary
290 with a special header) as build targets. By defining
291 CONFIG_BUILD_TARGET in the SoC / board header, this
292 special image will be automatically built upon calling
295 config SYS_CUSTOM_LDSCRIPT
296 bool "Use a custom location for the U-Boot linker script"
298 Normally when linking U-Boot we will look in the board directory,
299 the CPU directory and finally the "cpu" directory of the architecture
300 for the ile "u-boot.lds" and use that as our linker. However, in
301 some cases we need to provide a different linker script. To do so,
302 enable this option and then provide the location under
306 depends on SYS_CUSTOM_LDSCRIPT
307 string "Custom ldscript location"
309 Path within the source tree to the linker script to use for the
312 config ERR_PTR_OFFSET
316 Some U-Boot pointers have redundant information, so we can use a
317 scheme where we can return either an error code or a pointer with the
318 same return value. The default implementation just casts the pointer
319 to a number, however, this may fail on platforms where the end of the
320 address range is used for valid pointers (e.g. 0xffffff00 is a valid
321 heap pointer in socfpga SPL).
322 For such platforms, this value provides an upper range of those error
323 pointer values - up to 'MAX_ERRNO' bytes below this value must be
324 unused/invalid addresses.
326 config PLATFORM_ELFENTRY
328 default "__start" if MIPS
331 endmenu # General setup
335 config ANDROID_BOOT_IMAGE
336 bool "Enable support for Android Boot Images"
337 default y if FASTBOOT
339 This enables support for booting images which use the Android
343 bool "Support Flattened Image Tree"
347 This option allows you to boot the new uImage structure,
348 Flattened Image Tree. FIT is formally a FDT, which can include
349 images of various types (kernel, FDT blob, ramdisk, etc.)
350 in a single blob. To boot this new uImage structure,
351 pass the address of the blob to the "bootm" command.
352 FIT is very flexible, supporting compression, multiple images,
353 multiple configurations, verification through hashing and also
354 verified boot (secure boot using RSA).
358 config FIT_EXTERNAL_OFFSET
359 hex "FIT external data offset"
362 This specifies a data offset in fit image.
363 The offset is from data payload offset to the beginning of
364 fit image header. When specifies a offset, specific data
365 could be put in the hole between data payload and fit image
366 header, such as CSF data on i.MX platform.
368 config FIT_ENABLE_SHA256_SUPPORT
369 bool "Support SHA256 checksum of FIT image contents"
373 Enable this to support SHA256 checksum of FIT image contents. A
374 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
375 the image contents have not been corrupted.
377 config FIT_ENABLE_SHA384_SUPPORT
378 bool "Support SHA384 checksum of FIT image contents"
382 Enable this to support SHA384 checksum of FIT image contents. A
383 SHA384 checksum is a 384-bit (48-byte) hash value used to check that
384 the image contents have not been corrupted. Use this for the highest
387 config FIT_ENABLE_SHA512_SUPPORT
388 bool "Support SHA512 checksum of FIT image contents"
392 Enable this to support SHA512 checksum of FIT image contents. A
393 SHA512 checksum is a 512-bit (64-byte) hash value used to check that
394 the image contents have not been corrupted.
397 bool "Enable signature verification of FIT uImages"
402 select IMAGE_SIGN_INFO
404 This option enables signature verification of FIT uImages,
405 using a hash signed and verified using RSA. If
406 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
407 hashing is available using hardware, then the RSA library will use
408 it. See doc/uImage.FIT/signature.txt for more details.
410 WARNING: When relying on signed FIT images with a required signature
411 check the legacy image format is disabled by default, so that
412 unsigned images cannot be loaded. If a board needs the legacy image
413 format support in this case, enable it using
414 CONFIG_LEGACY_IMAGE_FORMAT.
416 config FIT_SIGNATURE_MAX_SIZE
417 hex "Max size of signed FIT structures"
418 depends on FIT_SIGNATURE
421 This option sets a max size in bytes for verified FIT uImages.
422 A sane value of 256MB protects corrupted DTB structures from overlapping
423 device memory. Assure this size does not extend past expected storage
426 config FIT_ENABLE_RSASSA_PSS_SUPPORT
427 bool "Support rsassa-pss signature scheme of FIT image contents"
428 depends on FIT_SIGNATURE
431 Enable this to support the pss padding algorithm as described
432 in the rfc8017 (https://tools.ietf.org/html/rfc8017).
435 bool "Enable ciphering data in a FIT uImages"
439 Enable the feature of data ciphering/unciphering in the tool mkimage
440 and in the u-boot support of the FIT image.
443 bool "Show verbose messages when FIT images fail"
445 Generally a system will have valid FIT images so debug messages
446 are a waste of code space. If you are debugging your images then
447 you can enable this option to get more verbose information about
450 config FIT_BEST_MATCH
451 bool "Select the best match for the kernel device tree"
453 When no configuration is explicitly selected, default to the
454 one whose fdt's compatibility field best matches that of
455 U-Boot itself. A match is considered "best" if it matches the
456 most specific compatibility entry of U-Boot's fdt's root node.
457 The order of entries in the configuration's fdt is ignored.
459 config FIT_IMAGE_POST_PROCESS
460 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
461 depends on TI_SECURE_DEVICE
463 Allows doing any sort of manipulation to blobs after they got extracted
464 from FIT images like stripping off headers or modifying the size of the
465 blob, verification, authentication, decryption etc. in a platform or
466 board specific way. In order to use this feature a platform or board-
467 specific implementation of board_fit_image_post_process() must be
468 provided. Also, anything done during this post-processing step would
469 need to be comprehended in how the images were prepared before being
470 injected into the FIT creation (i.e. the blobs would have been pre-
471 processed before being added to the FIT image).
476 bool "Support Flattened Image Tree within SPL"
481 bool "Support FIT printing within SPL"
484 Support printing the content of the fitImage in a verbose manner in SPL.
486 config SPL_FIT_SIGNATURE
487 bool "Enable signature verification of FIT firmware within SPL"
491 select SPL_RSA_VERIFY
492 select SPL_IMAGE_SIGN_INFO
495 bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
498 Normally with the SPL framework a legacy image is generated as part
499 of the build. This contains U-Boot along with information as to
500 where it should be loaded. This option instead enables generation
501 of a FIT (Flat Image Tree) which provides more flexibility. In
502 particular it can handle selecting from multiple device tree
503 and passing the correct one to U-Boot.
505 config SPL_LOAD_FIT_APPLY_OVERLAY
506 bool "Enable SPL applying DT overlays from FIT"
507 depends on SPL_LOAD_FIT
508 select OF_LIBFDT_OVERLAY
510 The device tree is loaded from the FIT image. Allow the SPL is to
511 also load device-tree overlays from the FIT image an apply them
512 over the device tree.
514 config SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
515 depends on SPL_LOAD_FIT_APPLY_OVERLAY
517 hex "size of temporary buffer used to load the overlays"
519 The size of the area where the overlays will be loaded and
520 uncompress. Must be at least as large as biggest overlay
523 config SPL_LOAD_FIT_FULL
524 bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
527 Normally with the SPL framework a legacy image is generated as part
528 of the build. This contains U-Boot along with information as to
529 where it should be loaded. This option instead enables generation
530 of a FIT (Flat Image Tree) which provides more flexibility. In
531 particular it can handle selecting from multiple device tree
532 and passing the correct one to U-Boot.
534 config SPL_FIT_IMAGE_POST_PROCESS
535 bool "Enable post-processing of FIT artifacts after loading by the SPL"
536 depends on SPL_LOAD_FIT
538 Allows doing any sort of manipulation to blobs after they got extracted
539 from the U-Boot FIT image like stripping off headers or modifying the
540 size of the blob, verification, authentication, decryption etc. in a
541 platform or board specific way. In order to use this feature a platform
542 or board-specific implementation of board_fit_image_post_process() must
543 be provided. Also, anything done during this post-processing step would
544 need to be comprehended in how the images were prepared before being
545 injected into the FIT creation (i.e. the blobs would have been pre-
546 processed before being added to the FIT image).
548 config SPL_FIT_SOURCE
549 string ".its source file for U-Boot FIT image"
552 Specifies a (platform specific) FIT source file to generate the
553 U-Boot FIT image. This could specify further image to load and/or
556 config SPL_FIT_GENERATOR
557 string ".its file generator script for U-Boot FIT image"
559 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
560 default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
561 default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
562 default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
564 Specifies a (platform specific) script file to generate the FIT
565 source file used to build the U-Boot FIT image file. This gets
566 passed a list of supported device tree file stub names to
567 include in the generated image.
573 config LEGACY_IMAGE_FORMAT
574 bool "Enable support for the legacy image format"
575 default y if !FIT_SIGNATURE
577 This option enables the legacy image format. It is enabled by
578 default for backward compatibility, unless FIT_SIGNATURE is
579 set where it is disabled so that unsigned images cannot be
580 loaded. If a board needs the legacy image format support in this
581 case, enable it here.
583 config OF_BOARD_SETUP
584 bool "Set up board-specific details in device tree before boot"
587 This causes U-Boot to call ft_board_setup() before booting into
588 the Operating System. This function can set up various
589 board-specific information in the device tree for use by the OS.
590 The device tree is then passed to the OS.
592 config OF_SYSTEM_SETUP
593 bool "Set up system-specific details in device tree before boot"
596 This causes U-Boot to call ft_system_setup() before booting into
597 the Operating System. This function can set up various
598 system-specific information in the device tree for use by the OS.
599 The device tree is then passed to the OS.
601 config OF_STDOUT_VIA_ALIAS
602 bool "Update the device-tree stdout alias from U-Boot"
605 This uses U-Boot's serial alias from the aliases node to update
606 the device tree passed to the OS. The "linux,stdout-path" property
607 in the chosen node is set to point to the correct serial node.
608 This option currently references CONFIG_CONS_INDEX, which is
609 incorrect when used with device tree as this option does not
610 exist / should not be used.
612 config SYS_EXTRA_OPTIONS
613 string "Extra Options (DEPRECATED)"
615 The old configuration infrastructure (= mkconfig + boards.cfg)
616 provided the extra options field. If you have something like
617 "HAS_BAR,BAZ=64", the optional options
619 #define CONFIG_BAZ 64
620 will be defined in include/config.h.
621 This option was prepared for the smooth migration from the old
622 configuration to Kconfig. Since this option will be removed sometime,
623 new boards should not use this option.
625 config HAVE_SYS_TEXT_BASE
627 depends on !NIOS2 && !XTENSA
632 depends on HAVE_SYS_TEXT_BASE
633 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
634 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
635 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
636 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
639 The address in memory that U-Boot will be running from, initially.
642 depends on ARC || ARCH_SUNXI || MPC83xx
643 int "CPU clock frequency"
645 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
647 config ARCH_FIXUP_FDT_MEMORY
648 bool "Enable arch_fixup_memory_banks() call"
651 Enable FDT memory map syncup before OS boot. This feature can be
652 used for booting OS with different memory setup where the part of
653 the memory location should be used for different purpose.
655 endmenu # Boot images
659 source "common/Kconfig"
663 source "disk/Kconfig"
671 source "drivers/Kconfig"
677 source "test/Kconfig"