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.
68 bool "Enable code coverage analysis"
71 Enabling this option will pass "--coverage" to gcc to compile
72 and link code instrumented for coverage analysis.
74 config CC_HAS_ASM_INLINE
75 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
77 config DISTRO_DEFAULTS
78 bool "Select defaults suitable for booting general purpose Linux distributions"
80 select CMDLINE_EDITING
81 select CMD_BOOTI if ARM64
82 select CMD_BOOTZ if ARM && !ARM64
83 select CMD_DHCP if CMD_NET
89 select CMD_PART if PARTITIONS
90 select CMD_PING if CMD_NET
93 select ENV_VARS_UBOOT_CONFIG
95 select SUPPORT_RAW_INITRD
101 Select this to enable various options and commands which are suitable
102 for building u-boot for booting general purpose Linux distributions.
104 config ENV_VARS_UBOOT_CONFIG
105 bool "Add arch, board, vendor and soc variables to default environment"
107 Define this in order to add variables describing the
108 U-Boot build configuration to the default environment.
109 These will be named arch, cpu, board, vendor, and soc.
110 Enabling this option will cause the following to be defined:
118 int "Number of DRAM banks"
119 default 1 if ARCH_SUNXI || ARCH_OWL
122 This defines the number of DRAM banks.
124 config SYS_BOOT_GET_CMDLINE
125 bool "Enable kernel command line setup"
127 Enables allocating and saving kernel cmdline in space between
128 "bootm_low" and "bootm_low" + BOOTMAPSZ.
130 config SYS_BOOT_GET_KBD
131 bool "Enable kernel board information setup"
133 Enables allocating and saving a kernel copy of the bd_info in
134 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
137 bool "Enable malloc() pool before relocation"
141 Before relocation, memory is very limited on many platforms. Still,
142 we can provide a small malloc() pool if needed. Driver model in
143 particular needs this to operate, so that it can allocate the
144 initial serial device and any others that are needed.
146 config SYS_MALLOC_F_LEN
147 hex "Size of malloc() pool before relocation"
148 depends on SYS_MALLOC_F
149 default 0x1000 if AM33XX
150 default 0x2800 if SANDBOX
151 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
152 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
153 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
154 ARCH_LS1046A || ARCH_QEMU)
157 Before relocation, memory is very limited on many platforms. Still,
158 we can provide a small malloc() pool if needed. Driver model in
159 particular needs this to operate, so that it can allocate the
160 initial serial device and any others that are needed.
162 config SYS_MALLOC_LEN
163 hex "Define memory for Dynamic allocation"
164 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
165 default 0x2000000 if ARCH_ROCKCHIP
167 This defines memory to be allocated for Dynamic allocation
168 TODO: Use for other architectures
170 config SPL_SYS_MALLOC_F_LEN
171 hex "Size of malloc() pool in SPL before relocation"
172 depends on SYS_MALLOC_F && SPL
173 default 0x2800 if RCAR_GEN3
174 default SYS_MALLOC_F_LEN
176 Before relocation, memory is very limited on many platforms. Still,
177 we can provide a small malloc() pool if needed. Driver model in
178 particular needs this to operate, so that it can allocate the
179 initial serial device and any others that are needed.
181 config TPL_SYS_MALLOC_F_LEN
182 hex "Size of malloc() pool in TPL before relocation"
183 depends on SYS_MALLOC_F && TPL
184 default SYS_MALLOC_F_LEN
186 Before relocation, memory is very limited on many platforms. Still,
187 we can provide a small malloc() pool if needed. Driver model in
188 particular needs this to operate, so that it can allocate the
189 initial serial device and any others that are needed.
192 bool "Configure standard U-Boot features (expert users)"
195 This option allows certain base U-Boot options and settings
196 to be disabled or tweaked. This is for specialized
197 environments which can tolerate a "non-standard" U-Boot.
198 Use this only if you really know what you are doing.
201 config SYS_MALLOC_CLEAR_ON_INIT
202 bool "Init with zeros the memory reserved for malloc (slow)"
205 This setting is enabled by default. The reserved malloc
206 memory is initialized with zeros, so first malloc calls
207 will return the pointer to the zeroed memory. But this
210 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
211 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
212 Then the boot time can be significantly reduced.
214 When disabling this, please check if malloc calls, maybe
215 should be replaced by calloc - if one expects zeroed memory.
217 config SYS_MALLOC_DEFAULT_TO_INIT
218 bool "Default malloc to init while reserving the memory for it"
221 It may happen that one needs to move the dynamic allocation
222 from one to another memory range, eg. when moving the malloc
223 from the limited static to a potentially large dynamic (DDR)
226 If so then on top of setting the updated memory aside one
227 needs to bring the malloc init.
229 If such a scenario is sought choose yes.
232 bool "Enable debug information for tools"
234 Enable generation of debug information for tools such as mkimage.
235 This can be used for debugging purposes. With debug information
236 it is possible to set breakpoints on particular lines, single-step
237 debug through the source code, etc.
242 bool "64bit physical address support"
244 Say Y here to support 64bit physical memory address.
245 This can be used not only for 64bit SoCs, but also for
246 large physical address extension on 32bit SoCs.
249 bool "Build U-Boot as BIOS replacement"
252 This option allows to build a ROM version of U-Boot.
253 The build process generally requires several binary blobs
254 which are not shipped in the U-Boot source tree.
255 Please, see doc/arch/x86.rst for details.
258 string "SPL image used in the combined SPL+U-Boot image"
259 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
260 default "spl/u-boot-spl.bin"
263 Select the SPL build target that shall be generated by the SPL
264 build process (default spl/u-boot-spl.bin). This image will be
265 used to generate a combined image with SPL and main U-Boot
266 proper as one single image.
269 string "Build target special images"
270 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
271 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
272 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
273 default "u-boot-elf.srec" if RCAR_GEN3
274 default "u-boot.itb" if SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
275 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
276 default "u-boot.kwb" if ARCH_KIRKWOOD
277 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
278 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
280 Some SoCs need special image types (e.g. U-Boot binary
281 with a special header) as build targets. By defining
282 CONFIG_BUILD_TARGET in the SoC / board header, this
283 special image will be automatically built upon calling
286 config SYS_CUSTOM_LDSCRIPT
287 bool "Use a custom location for the U-Boot linker script"
289 Normally when linking U-Boot we will look in the board directory,
290 the CPU directory and finally the "cpu" directory of the architecture
291 for the ile "u-boot.lds" and use that as our linker. However, in
292 some cases we need to provide a different linker script. To do so,
293 enable this option and then provide the location under
297 depends on SYS_CUSTOM_LDSCRIPT
298 string "Custom ldscript location"
300 Path within the source tree to the linker script to use for the
303 config ERR_PTR_OFFSET
307 Some U-Boot pointers have redundant information, so we can use a
308 scheme where we can return either an error code or a pointer with the
309 same return value. The default implementation just casts the pointer
310 to a number, however, this may fail on platforms where the end of the
311 address range is used for valid pointers (e.g. 0xffffff00 is a valid
312 heap pointer in socfpga SPL).
313 For such platforms, this value provides an upper range of those error
314 pointer values - up to 'MAX_ERRNO' bytes below this value must be
315 unused/invalid addresses.
317 config PLATFORM_ELFENTRY
319 default "__start" if MIPS
322 endmenu # General setup
326 config ANDROID_BOOT_IMAGE
327 bool "Enable support for Android Boot Images"
328 default y if FASTBOOT
330 This enables support for booting images which use the Android
334 bool "Support Flattened Image Tree"
338 This option allows you to boot the new uImage structure,
339 Flattened Image Tree. FIT is formally a FDT, which can include
340 images of various types (kernel, FDT blob, ramdisk, etc.)
341 in a single blob. To boot this new uImage structure,
342 pass the address of the blob to the "bootm" command.
343 FIT is very flexible, supporting compression, multiple images,
344 multiple configurations, verification through hashing and also
345 verified boot (secure boot using RSA).
349 config FIT_EXTERNAL_OFFSET
350 hex "FIT external data offset"
353 This specifies a data offset in fit image.
354 The offset is from data payload offset to the beginning of
355 fit image header. When specifies a offset, specific data
356 could be put in the hole between data payload and fit image
357 header, such as CSF data on i.MX platform.
359 config FIT_ENABLE_SHA256_SUPPORT
360 bool "Support SHA256 checksum of FIT image contents"
364 Enable this to support SHA256 checksum of FIT image contents. A
365 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
366 the image contents have not been corrupted.
368 config FIT_ENABLE_SHA384_SUPPORT
369 bool "Support SHA384 checksum of FIT image contents"
373 Enable this to support SHA384 checksum of FIT image contents. A
374 SHA384 checksum is a 384-bit (48-byte) hash value used to check that
375 the image contents have not been corrupted. Use this for the highest
378 config FIT_ENABLE_SHA512_SUPPORT
379 bool "Support SHA512 checksum of FIT image contents"
383 Enable this to support SHA512 checksum of FIT image contents. A
384 SHA512 checksum is a 512-bit (64-byte) hash value used to check that
385 the image contents have not been corrupted.
388 bool "Enable signature verification of FIT uImages"
393 select IMAGE_SIGN_INFO
395 This option enables signature verification of FIT uImages,
396 using a hash signed and verified using RSA. If
397 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
398 hashing is available using hardware, then the RSA library will use
399 it. See doc/uImage.FIT/signature.txt for more details.
401 WARNING: When relying on signed FIT images with a required signature
402 check the legacy image format is disabled by default, so that
403 unsigned images cannot be loaded. If a board needs the legacy image
404 format support in this case, enable it using
405 CONFIG_LEGACY_IMAGE_FORMAT.
407 config FIT_SIGNATURE_MAX_SIZE
408 hex "Max size of signed FIT structures"
409 depends on FIT_SIGNATURE
412 This option sets a max size in bytes for verified FIT uImages.
413 A sane value of 256MB protects corrupted DTB structures from overlapping
414 device memory. Assure this size does not extend past expected storage
417 config FIT_ENABLE_RSASSA_PSS_SUPPORT
418 bool "Support rsassa-pss signature scheme of FIT image contents"
419 depends on FIT_SIGNATURE
422 Enable this to support the pss padding algorithm as described
423 in the rfc8017 (https://tools.ietf.org/html/rfc8017).
426 bool "Enable ciphering data in a FIT uImages"
430 Enable the feature of data ciphering/unciphering in the tool mkimage
431 and in the u-boot support of the FIT image.
434 bool "Show verbose messages when FIT images fail"
436 Generally a system will have valid FIT images so debug messages
437 are a waste of code space. If you are debugging your images then
438 you can enable this option to get more verbose information about
441 config FIT_BEST_MATCH
442 bool "Select the best match for the kernel device tree"
444 When no configuration is explicitly selected, default to the
445 one whose fdt's compatibility field best matches that of
446 U-Boot itself. A match is considered "best" if it matches the
447 most specific compatibility entry of U-Boot's fdt's root node.
448 The order of entries in the configuration's fdt is ignored.
450 config FIT_IMAGE_POST_PROCESS
451 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
452 depends on TI_SECURE_DEVICE
454 Allows doing any sort of manipulation to blobs after they got extracted
455 from FIT images like stripping off headers or modifying the size of the
456 blob, verification, authentication, decryption etc. in a platform or
457 board specific way. In order to use this feature a platform or board-
458 specific implementation of board_fit_image_post_process() must be
459 provided. Also, anything done during this post-processing step would
460 need to be comprehended in how the images were prepared before being
461 injected into the FIT creation (i.e. the blobs would have been pre-
462 processed before being added to the FIT image).
467 bool "Support Flattened Image Tree within SPL"
472 bool "Support FIT printing within SPL"
475 Support printing the content of the fitImage in a verbose manner in SPL.
477 config SPL_FIT_SIGNATURE
478 bool "Enable signature verification of FIT firmware within SPL"
482 select SPL_RSA_VERIFY
483 select SPL_IMAGE_SIGN_INFO
486 bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
489 Normally with the SPL framework a legacy image is generated as part
490 of the build. This contains U-Boot along with information as to
491 where it should be loaded. This option instead enables generation
492 of a FIT (Flat Image Tree) which provides more flexibility. In
493 particular it can handle selecting from multiple device tree
494 and passing the correct one to U-Boot.
496 config SPL_LOAD_FIT_APPLY_OVERLAY
497 bool "Enable SPL applying DT overlays from FIT"
498 depends on SPL_LOAD_FIT
499 select OF_LIBFDT_OVERLAY
501 The device tree is loaded from the FIT image. Allow the SPL is to
502 also load device-tree overlays from the FIT image an apply them
503 over the device tree.
505 config SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
506 depends on SPL_LOAD_FIT_APPLY_OVERLAY
508 hex "size of temporary buffer used to load the overlays"
510 The size of the area where the overlays will be loaded and
511 uncompress. Must be at least as large as biggest overlay
514 config SPL_LOAD_FIT_FULL
515 bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
518 Normally with the SPL framework a legacy image is generated as part
519 of the build. This contains U-Boot along with information as to
520 where it should be loaded. This option instead enables generation
521 of a FIT (Flat Image Tree) which provides more flexibility. In
522 particular it can handle selecting from multiple device tree
523 and passing the correct one to U-Boot.
525 config SPL_FIT_IMAGE_POST_PROCESS
526 bool "Enable post-processing of FIT artifacts after loading by the SPL"
527 depends on SPL_LOAD_FIT
529 Allows doing any sort of manipulation to blobs after they got extracted
530 from the U-Boot FIT image like stripping off headers or modifying the
531 size of the blob, verification, authentication, decryption etc. in a
532 platform or board specific way. In order to use this feature a platform
533 or board-specific implementation of board_fit_image_post_process() must
534 be provided. Also, anything done during this post-processing step would
535 need to be comprehended in how the images were prepared before being
536 injected into the FIT creation (i.e. the blobs would have been pre-
537 processed before being added to the FIT image).
539 config SPL_FIT_SOURCE
540 string ".its source file for U-Boot FIT image"
543 Specifies a (platform specific) FIT source file to generate the
544 U-Boot FIT image. This could specify further image to load and/or
547 config SPL_FIT_GENERATOR
548 string ".its file generator script for U-Boot FIT image"
550 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
551 default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
552 default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
553 default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
555 Specifies a (platform specific) script file to generate the FIT
556 source file used to build the U-Boot FIT image file. This gets
557 passed a list of supported device tree file stub names to
558 include in the generated image.
564 config LEGACY_IMAGE_FORMAT
565 bool "Enable support for the legacy image format"
566 default y if !FIT_SIGNATURE
568 This option enables the legacy image format. It is enabled by
569 default for backward compatibility, unless FIT_SIGNATURE is
570 set where it is disabled so that unsigned images cannot be
571 loaded. If a board needs the legacy image format support in this
572 case, enable it here.
574 config OF_BOARD_SETUP
575 bool "Set up board-specific details in device tree before boot"
578 This causes U-Boot to call ft_board_setup() before booting into
579 the Operating System. This function can set up various
580 board-specific information in the device tree for use by the OS.
581 The device tree is then passed to the OS.
583 config OF_SYSTEM_SETUP
584 bool "Set up system-specific details in device tree before boot"
587 This causes U-Boot to call ft_system_setup() before booting into
588 the Operating System. This function can set up various
589 system-specific information in the device tree for use by the OS.
590 The device tree is then passed to the OS.
592 config OF_STDOUT_VIA_ALIAS
593 bool "Update the device-tree stdout alias from U-Boot"
596 This uses U-Boot's serial alias from the aliases node to update
597 the device tree passed to the OS. The "linux,stdout-path" property
598 in the chosen node is set to point to the correct serial node.
599 This option currently references CONFIG_CONS_INDEX, which is
600 incorrect when used with device tree as this option does not
601 exist / should not be used.
603 config SYS_EXTRA_OPTIONS
604 string "Extra Options (DEPRECATED)"
606 The old configuration infrastructure (= mkconfig + boards.cfg)
607 provided the extra options field. If you have something like
608 "HAS_BAR,BAZ=64", the optional options
610 #define CONFIG_BAZ 64
611 will be defined in include/config.h.
612 This option was prepared for the smooth migration from the old
613 configuration to Kconfig. Since this option will be removed sometime,
614 new boards should not use this option.
616 config HAVE_SYS_TEXT_BASE
618 depends on !NIOS2 && !XTENSA
623 depends on HAVE_SYS_TEXT_BASE
624 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
625 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
626 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
627 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
630 The address in memory that U-Boot will be running from, initially.
633 depends on ARC || ARCH_SUNXI || MPC83xx
634 int "CPU clock frequency"
636 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
638 config ARCH_FIXUP_FDT_MEMORY
639 bool "Enable arch_fixup_memory_banks() call"
642 Enable FDT memory map syncup before OS boot. This feature can be
643 used for booting OS with different memory setup where the part of
644 the memory location should be used for different purpose.
646 endmenu # Boot images
650 source "common/Kconfig"
654 source "disk/Kconfig"
662 source "drivers/Kconfig"
668 source "test/Kconfig"