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 # Allow defaults in arch-specific code to override any given here
16 This option cannot be enabled. It is used as dependency
17 for broken and incomplete features.
22 This option cannot be enabled. It it used as a dependency for
23 code that relies on deprecated features that will be removed and
24 the conversion deadline has passed.
27 string "Local version - append to U-Boot release"
29 Append an extra string to the end of your U-Boot version.
30 This will show up in your boot log, for example.
31 The string you set here will be appended after the contents of
32 any files with a filename matching localversion* in your
33 object and source tree, in that order. Your total string can
34 be a maximum of 64 characters.
36 config LOCALVERSION_AUTO
37 bool "Automatically append version information to the version string"
40 This will try to automatically determine if the current tree is a
41 release tree by looking for Git tags that belong to the current
44 A string of the format -gxxxxxxxx will be added to the localversion
45 if a Git-based tree is found. The string generated by this will be
46 appended after any matching localversion* files, and after the value
47 set in CONFIG_LOCALVERSION.
49 (The actual string used here is the first eight characters produced
50 by running the command:
52 $ git rev-parse --verify HEAD
54 which is done within the script "scripts/setlocalversion".)
56 config CC_OPTIMIZE_FOR_SIZE
57 bool "Optimize for size"
60 Enabling this option will pass "-Os" instead of "-O2" to gcc
61 resulting in a smaller U-Boot image.
63 This option is enabled by default for U-Boot.
66 bool "Enable code coverage analysis"
69 Enabling this option will pass "--coverage" to gcc to compile
70 and link code instrumented for coverage analysis.
72 config DISTRO_DEFAULTS
73 bool "Select defaults suitable for booting general purpose Linux distributions"
75 select CMDLINE_EDITING
76 select CMD_BOOTI if ARM64
77 select CMD_BOOTZ if ARM && !ARM64
78 select CMD_DHCP if CMD_NET
84 select CMD_PART if PARTITIONS
85 select CMD_PING if CMD_NET
88 select ENV_VARS_UBOOT_CONFIG
90 select SUPPORT_RAW_INITRD
96 Select this to enable various options and commands which are suitable
97 for building u-boot for booting general purpose Linux distributions.
99 config ENV_VARS_UBOOT_CONFIG
100 bool "Add arch, board, vendor and soc variables to default environment"
102 Define this in order to add variables describing the
103 U-Boot build configuration to the default environment.
104 These will be named arch, cpu, board, vendor, and soc.
105 Enabling this option will cause the following to be defined:
113 int "Number of DRAM banks"
116 This defines the number of DRAM banks.
118 config SYS_BOOT_GET_CMDLINE
119 bool "Enable kernel command line setup"
121 Enables allocating and saving kernel cmdline in space between
122 "bootm_low" and "bootm_low" + BOOTMAPSZ.
124 config SYS_BOOT_GET_KBD
125 bool "Enable kernel board information setup"
127 Enables allocating and saving a kernel copy of the bd_info in
128 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
131 bool "Enable malloc() pool before relocation"
135 Before relocation, memory is very limited on many platforms. Still,
136 we can provide a small malloc() pool if needed. Driver model in
137 particular needs this to operate, so that it can allocate the
138 initial serial device and any others that are needed.
140 config SYS_MALLOC_F_LEN
141 hex "Size of malloc() pool before relocation"
142 depends on SYS_MALLOC_F
143 default 0x1000 if AM33XX
144 default 0x2800 if SANDBOX
145 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
146 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
147 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
151 Before relocation, memory is very limited on many platforms. Still,
152 we can provide a small malloc() pool if needed. Driver model in
153 particular needs this to operate, so that it can allocate the
154 initial serial device and any others that are needed.
156 config SYS_MALLOC_LEN
157 hex "Define memory for Dynamic allocation"
158 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
159 default 0x2000000 if ARCH_ROCKCHIP
161 This defines memory to be allocated for Dynamic allocation
162 TODO: Use for other architectures
164 config SPL_SYS_MALLOC_F_LEN
165 hex "Size of malloc() pool in SPL before relocation"
166 depends on SYS_MALLOC_F && SPL
167 default 0x2800 if RCAR_GEN3
168 default SYS_MALLOC_F_LEN
170 Before relocation, memory is very limited on many platforms. Still,
171 we can provide a small malloc() pool if needed. Driver model in
172 particular needs this to operate, so that it can allocate the
173 initial serial device and any others that are needed.
175 config TPL_SYS_MALLOC_F_LEN
176 hex "Size of malloc() pool in TPL before relocation"
177 depends on SYS_MALLOC_F && TPL
178 default SYS_MALLOC_F_LEN
180 Before relocation, memory is very limited on many platforms. Still,
181 we can provide a small malloc() pool if needed. Driver model in
182 particular needs this to operate, so that it can allocate the
183 initial serial device and any others that are needed.
186 bool "Configure standard U-Boot features (expert users)"
189 This option allows certain base U-Boot options and settings
190 to be disabled or tweaked. This is for specialized
191 environments which can tolerate a "non-standard" U-Boot.
192 Use this only if you really know what you are doing.
195 config SYS_MALLOC_CLEAR_ON_INIT
196 bool "Init with zeros the memory reserved for malloc (slow)"
199 This setting is enabled by default. The reserved malloc
200 memory is initialized with zeros, so first malloc calls
201 will return the pointer to the zeroed memory. But this
204 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
205 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
206 Then the boot time can be significantly reduced.
208 When disabling this, please check if malloc calls, maybe
209 should be replaced by calloc - if one expects zeroed memory.
212 bool "Enable debug information for tools"
214 Enable generation of debug information for tools such as mkimage.
215 This can be used for debugging purposes. With debug information
216 it is possible to set breakpoints on particular lines, single-step
217 debug through the source code, etc.
222 bool "64bit physical address support"
224 Say Y here to support 64bit physical memory address.
225 This can be used not only for 64bit SoCs, but also for
226 large physical address extension on 32bit SoCs.
229 bool "Build U-Boot as BIOS replacement"
232 This option allows to build a ROM version of U-Boot.
233 The build process generally requires several binary blobs
234 which are not shipped in the U-Boot source tree.
235 Please, see doc/README.x86 for details.
238 string "SPL image used in the combined SPL+U-Boot image"
239 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
240 default "spl/u-boot-spl.bin"
243 Select the SPL build target that shall be generated by the SPL
244 build process (default spl/u-boot-spl.bin). This image will be
245 used to generate a combined image with SPL and main U-Boot
246 proper as one single image.
249 string "Build target special images"
250 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
251 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
252 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
253 default "u-boot-elf.srec" if RCAR_GEN3
254 default "u-boot.itb" if SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
255 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
256 default "u-boot.kwb" if KIRKWOOD
257 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
258 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
260 Some SoCs need special image types (e.g. U-Boot binary
261 with a special header) as build targets. By defining
262 CONFIG_BUILD_TARGET in the SoC / board header, this
263 special image will be automatically built upon calling
266 config SYS_CUSTOM_LDSCRIPT
267 bool "Use a custom location for the U-Boot linker script"
269 Normally when linking U-Boot we will look in the board directory,
270 the CPU directory and finally the "cpu" directory of the architecture
271 for the ile "u-boot.lds" and use that as our linker. However, in
272 some cases we need to provide a different linker script. To do so,
273 enable this option and then provide the location under
277 depends on SYS_CUSTOM_LDSCRIPT
278 string "Custom ldscript location"
280 Path within the source tree to the linker script to use for the
283 config ERR_PTR_OFFSET
287 Some U-Boot pointers have redundant information, so we can use a
288 scheme where we can return either an error code or a pointer with the
289 same return value. The default implementation just casts the pointer
290 to a number, however, this may fail on platforms where the end of the
291 address range is used for valid pointers (e.g. 0xffffff00 is a valid
292 heap pointer in socfpga SPL).
293 For such platforms, this value provides an upper range of those error
294 pointer values - up to 'MAX_ERRNO' bytes below this value must be
295 unused/invalid addresses.
297 endmenu # General setup
301 config ANDROID_BOOT_IMAGE
302 bool "Enable support for Android Boot Images"
303 default y if FASTBOOT
305 This enables support for booting images which use the Android
309 bool "Support Flattened Image Tree"
313 This option allows you to boot the new uImage structure,
314 Flattened Image Tree. FIT is formally a FDT, which can include
315 images of various types (kernel, FDT blob, ramdisk, etc.)
316 in a single blob. To boot this new uImage structure,
317 pass the address of the blob to the "bootm" command.
318 FIT is very flexible, supporting compression, multiple images,
319 multiple configurations, verification through hashing and also
320 verified boot (secure boot using RSA).
324 config FIT_EXTERNAL_OFFSET
325 hex "FIT external data offset"
328 This specifies a data offset in fit image.
329 The offset is from data payload offset to the beginning of
330 fit image header. When specifies a offset, specific data
331 could be put in the hole between data payload and fit image
332 header, such as CSF data on i.MX platform.
334 config FIT_ENABLE_SHA256_SUPPORT
335 bool "Support SHA256 checksum of FIT image contents"
339 Enable this to support SHA256 checksum of FIT image contents. A
340 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
341 the image contents have not been corrupted. SHA256 is recommended
342 for use in secure applications since (as at 2016) there is no known
343 feasible attack that could produce a 'collision' with differing
344 input data. Use this for the highest security. Note that only the
345 SHA256 variant is supported: SHA512 and others are not currently
349 bool "Enable signature verification of FIT uImages"
354 select IMAGE_SIGN_INFO
356 This option enables signature verification of FIT uImages,
357 using a hash signed and verified using RSA. If
358 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
359 hashing is available using hardware, then the RSA library will use
360 it. See doc/uImage.FIT/signature.txt for more details.
362 WARNING: When relying on signed FIT images with a required signature
363 check the legacy image format is disabled by default, so that
364 unsigned images cannot be loaded. If a board needs the legacy image
365 format support in this case, enable it using
366 CONFIG_LEGACY_IMAGE_FORMAT.
368 config FIT_SIGNATURE_MAX_SIZE
369 hex "Max size of signed FIT structures"
370 depends on FIT_SIGNATURE
373 This option sets a max size in bytes for verified FIT uImages.
374 A sane value of 256MB protects corrupted DTB structures from overlapping
375 device memory. Assure this size does not extend past expected storage
378 config FIT_ENABLE_RSASSA_PSS_SUPPORT
379 bool "Support rsassa-pss signature scheme of FIT image contents"
380 depends on FIT_SIGNATURE
383 Enable this to support the pss padding algorithm as described
384 in the rfc8017 (https://tools.ietf.org/html/rfc8017).
387 bool "Enable ciphering data in a FIT uImages"
391 Enable the feature of data ciphering/unciphering in the tool mkimage
392 and in the u-boot support of the FIT image.
395 bool "Show verbose messages when FIT images fail"
397 Generally a system will have valid FIT images so debug messages
398 are a waste of code space. If you are debugging your images then
399 you can enable this option to get more verbose information about
402 config FIT_BEST_MATCH
403 bool "Select the best match for the kernel device tree"
405 When no configuration is explicitly selected, default to the
406 one whose fdt's compatibility field best matches that of
407 U-Boot itself. A match is considered "best" if it matches the
408 most specific compatibility entry of U-Boot's fdt's root node.
409 The order of entries in the configuration's fdt is ignored.
411 config FIT_IMAGE_POST_PROCESS
412 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
413 depends on TI_SECURE_DEVICE
415 Allows doing any sort of manipulation to blobs after they got extracted
416 from FIT images like stripping off headers or modifying the size of the
417 blob, verification, authentication, decryption etc. in a platform or
418 board specific way. In order to use this feature a platform or board-
419 specific implementation of board_fit_image_post_process() must be
420 provided. Also, anything done during this post-processing step would
421 need to be comprehended in how the images were prepared before being
422 injected into the FIT creation (i.e. the blobs would have been pre-
423 processed before being added to the FIT image).
428 bool "Support Flattened Image Tree within SPL"
433 bool "Support FIT printing within SPL"
436 Support printing the content of the fitImage in a verbose manner in SPL.
438 config SPL_FIT_SIGNATURE
439 bool "Enable signature verification of FIT firmware within SPL"
443 select SPL_RSA_VERIFY
444 select IMAGE_SIGN_INFO
447 bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
450 Normally with the SPL framework a legacy image is generated as part
451 of the build. This contains U-Boot along with information as to
452 where it should be loaded. This option instead enables generation
453 of a FIT (Flat Image Tree) which provides more flexibility. In
454 particular it can handle selecting from multiple device tree
455 and passing the correct one to U-Boot.
457 config SPL_LOAD_FIT_APPLY_OVERLAY
458 bool "Enable SPL applying DT overlays from FIT"
459 depends on SPL_LOAD_FIT
460 select OF_LIBFDT_OVERLAY
462 The device tree is loaded from the FIT image. Allow the SPL is to
463 also load device-tree overlays from the FIT image an apply them
464 over the device tree.
466 config SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
467 depends on SPL_LOAD_FIT_APPLY_OVERLAY
469 hex "size of temporary buffer used to load the overlays"
471 The size of the area where the overlays will be loaded and
472 uncompress. Must be at least as large as biggest overlay
475 config SPL_LOAD_FIT_FULL
476 bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
479 Normally with the SPL framework a legacy image is generated as part
480 of the build. This contains U-Boot along with information as to
481 where it should be loaded. This option instead enables generation
482 of a FIT (Flat Image Tree) which provides more flexibility. In
483 particular it can handle selecting from multiple device tree
484 and passing the correct one to U-Boot.
486 config SPL_FIT_IMAGE_POST_PROCESS
487 bool "Enable post-processing of FIT artifacts after loading by the SPL"
488 depends on SPL_LOAD_FIT
490 Allows doing any sort of manipulation to blobs after they got extracted
491 from the U-Boot FIT image like stripping off headers or modifying the
492 size of the blob, verification, authentication, decryption etc. in a
493 platform or board specific way. In order to use this feature a platform
494 or board-specific implementation of board_fit_image_post_process() must
495 be provided. Also, anything done during this post-processing step would
496 need to be comprehended in how the images were prepared before being
497 injected into the FIT creation (i.e. the blobs would have been pre-
498 processed before being added to the FIT image).
500 config SPL_FIT_SOURCE
501 string ".its source file for U-Boot FIT image"
504 Specifies a (platform specific) FIT source file to generate the
505 U-Boot FIT image. This could specify further image to load and/or
508 config SPL_FIT_GENERATOR
509 string ".its file generator script for U-Boot FIT image"
511 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
512 default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
513 default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
514 default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
516 Specifies a (platform specific) script file to generate the FIT
517 source file used to build the U-Boot FIT image file. This gets
518 passed a list of supported device tree file stub names to
519 include in the generated image.
525 config LEGACY_IMAGE_FORMAT
526 bool "Enable support for the legacy image format"
527 default y if !FIT_SIGNATURE
529 This option enables the legacy image format. It is enabled by
530 default for backward compatibility, unless FIT_SIGNATURE is
531 set where it is disabled so that unsigned images cannot be
532 loaded. If a board needs the legacy image format support in this
533 case, enable it here.
535 config OF_BOARD_SETUP
536 bool "Set up board-specific details in device tree before boot"
539 This causes U-Boot to call ft_board_setup() before booting into
540 the Operating System. This function can set up various
541 board-specific information in the device tree for use by the OS.
542 The device tree is then passed to the OS.
544 config OF_SYSTEM_SETUP
545 bool "Set up system-specific details in device tree before boot"
548 This causes U-Boot to call ft_system_setup() before booting into
549 the Operating System. This function can set up various
550 system-specific information in the device tree for use by the OS.
551 The device tree is then passed to the OS.
553 config OF_STDOUT_VIA_ALIAS
554 bool "Update the device-tree stdout alias from U-Boot"
557 This uses U-Boot's serial alias from the aliases node to update
558 the device tree passed to the OS. The "linux,stdout-path" property
559 in the chosen node is set to point to the correct serial node.
560 This option currently references CONFIG_CONS_INDEX, which is
561 incorrect when used with device tree as this option does not
562 exist / should not be used.
564 config SYS_EXTRA_OPTIONS
565 string "Extra Options (DEPRECATED)"
567 The old configuration infrastructure (= mkconfig + boards.cfg)
568 provided the extra options field. If you have something like
569 "HAS_BAR,BAZ=64", the optional options
571 #define CONFIG_BAZ 64
572 will be defined in include/config.h.
573 This option was prepared for the smooth migration from the old
574 configuration to Kconfig. Since this option will be removed sometime,
575 new boards should not use this option.
577 config HAVE_SYS_TEXT_BASE
579 depends on !NIOS2 && !XTENSA
584 depends on HAVE_SYS_TEXT_BASE
585 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
586 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
587 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
588 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
591 The address in memory that U-Boot will be running from, initially.
594 depends on ARC || ARCH_SUNXI || MPC83xx
595 int "CPU clock frequency"
597 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
599 config ARCH_FIXUP_FDT_MEMORY
600 bool "Enable arch_fixup_memory_banks() call"
603 Enable FDT memory map syncup before OS boot. This feature can be
604 used for booting OS with different memory setup where the part of
605 the memory location should be used for different purpose.
607 endmenu # Boot images
611 source "common/Kconfig"
615 source "disk/Kconfig"
623 source "drivers/Kconfig"
629 source "test/Kconfig"