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"
10 option env="UBOOTVERSION"
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".)
60 config CC_OPTIMIZE_FOR_SIZE
61 bool "Optimize for size"
64 Enabling this option will pass "-Os" instead of "-O2" to gcc
65 resulting in a smaller U-Boot image.
67 This option is enabled by default for U-Boot.
70 bool "Enable code coverage analysis"
73 Enabling this option will pass "--coverage" to gcc to compile
74 and link code instrumented for coverage analysis.
76 config DISTRO_DEFAULTS
77 bool "Select defaults suitable for booting general purpose Linux distributions"
79 select CMDLINE_EDITING
80 select CMD_BOOTI if ARM64
81 select CMD_BOOTZ if ARM && !ARM64
82 select CMD_DHCP if CMD_NET
88 select CMD_PART if PARTITIONS
89 select CMD_PING if CMD_NET
92 select ENV_VARS_UBOOT_CONFIG
94 select SUPPORT_RAW_INITRD
100 Select this to enable various options and commands which are suitable
101 for building u-boot for booting general purpose Linux distributions.
103 config ENV_VARS_UBOOT_CONFIG
104 bool "Add arch, board, vendor and soc variables to default environment"
106 Define this in order to add variables describing the
107 U-Boot build configuration to the default environment.
108 These will be named arch, cpu, board, vendor, and soc.
109 Enabling this option will cause the following to be defined:
117 int "Number of DRAM banks"
118 default 1 if ARCH_SUNXI
121 This defines the number of DRAM banks.
123 config SYS_BOOT_GET_CMDLINE
124 bool "Enable kernel command line setup"
126 Enables allocating and saving kernel cmdline in space between
127 "bootm_low" and "bootm_low" + BOOTMAPSZ.
129 config SYS_BOOT_GET_KBD
130 bool "Enable kernel board information setup"
132 Enables allocating and saving a kernel copy of the bd_info in
133 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
136 bool "Enable malloc() pool before relocation"
140 Before relocation, memory is very limited on many platforms. Still,
141 we can provide a small malloc() pool if needed. Driver model in
142 particular needs this to operate, so that it can allocate the
143 initial serial device and any others that are needed.
145 config SYS_MALLOC_F_LEN
146 hex "Size of malloc() pool before relocation"
147 depends on SYS_MALLOC_F
148 default 0x1000 if AM33XX
149 default 0x2800 if SANDBOX
150 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
151 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
152 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
156 Before relocation, memory is very limited on many platforms. Still,
157 we can provide a small malloc() pool if needed. Driver model in
158 particular needs this to operate, so that it can allocate the
159 initial serial device and any others that are needed.
161 config SYS_MALLOC_LEN
162 hex "Define memory for Dynamic allocation"
163 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
164 default 0x2000000 if ARCH_ROCKCHIP
166 This defines memory to be allocated for Dynamic allocation
167 TODO: Use for other architectures
169 config SPL_SYS_MALLOC_F_LEN
170 hex "Size of malloc() pool in SPL before relocation"
171 depends on SYS_MALLOC_F && SPL
172 default 0x2800 if RCAR_GEN3
173 default SYS_MALLOC_F_LEN
175 Before relocation, memory is very limited on many platforms. Still,
176 we can provide a small malloc() pool if needed. Driver model in
177 particular needs this to operate, so that it can allocate the
178 initial serial device and any others that are needed.
180 config TPL_SYS_MALLOC_F_LEN
181 hex "Size of malloc() pool in TPL before relocation"
182 depends on SYS_MALLOC_F && TPL
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.
191 bool "Configure standard U-Boot features (expert users)"
194 This option allows certain base U-Boot options and settings
195 to be disabled or tweaked. This is for specialized
196 environments which can tolerate a "non-standard" U-Boot.
197 Use this only if you really know what you are doing.
200 config SYS_MALLOC_CLEAR_ON_INIT
201 bool "Init with zeros the memory reserved for malloc (slow)"
204 This setting is enabled by default. The reserved malloc
205 memory is initialized with zeros, so first malloc calls
206 will return the pointer to the zeroed memory. But this
209 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
210 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
211 Then the boot time can be significantly reduced.
213 When disabling this, please check if malloc calls, maybe
214 should be replaced by calloc - if one expects zeroed memory.
217 bool "Enable debug information for tools"
219 Enable generation of debug information for tools such as mkimage.
220 This can be used for debugging purposes. With debug information
221 it is possible to set breakpoints on particular lines, single-step
222 debug through the source code, etc.
227 bool "64bit physical address support"
229 Say Y here to support 64bit physical memory address.
230 This can be used not only for 64bit SoCs, but also for
231 large physical address extension on 32bit SoCs.
234 bool "Build U-Boot as BIOS replacement"
237 This option allows to build a ROM version of U-Boot.
238 The build process generally requires several binary blobs
239 which are not shipped in the U-Boot source tree.
240 Please, see doc/README.x86 for details.
243 string "SPL image used in the combined SPL+U-Boot image"
244 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
245 default "spl/u-boot-spl.bin"
248 Select the SPL build target that shall be generated by the SPL
249 build process (default spl/u-boot-spl.bin). This image will be
250 used to generate a combined image with SPL and main U-Boot
251 proper as one single image.
254 string "Build target special images"
255 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
256 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
257 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
258 default "u-boot-elf.srec" if RCAR_GEN3
259 default "u-boot.itb" if SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
260 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
261 default "u-boot.kwb" if KIRKWOOD
262 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
263 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
265 Some SoCs need special image types (e.g. U-Boot binary
266 with a special header) as build targets. By defining
267 CONFIG_BUILD_TARGET in the SoC / board header, this
268 special image will be automatically built upon calling
271 config SYS_CUSTOM_LDSCRIPT
272 bool "Use a custom location for the U-Boot linker script"
274 Normally when linking U-Boot we will look in the board directory,
275 the CPU directory and finally the "cpu" directory of the architecture
276 for the ile "u-boot.lds" and use that as our linker. However, in
277 some cases we need to provide a different linker script. To do so,
278 enable this option and then provide the location under
282 depends on SYS_CUSTOM_LDSCRIPT
283 string "Custom ldscript location"
285 Path within the source tree to the linker script to use for the
288 config ERR_PTR_OFFSET
292 Some U-Boot pointers have redundant information, so we can use a
293 scheme where we can return either an error code or a pointer with the
294 same return value. The default implementation just casts the pointer
295 to a number, however, this may fail on platforms where the end of the
296 address range is used for valid pointers (e.g. 0xffffff00 is a valid
297 heap pointer in socfpga SPL).
298 For such platforms, this value provides an upper range of those error
299 pointer values - up to 'MAX_ERRNO' bytes below this value must be
300 unused/invalid addresses.
302 endmenu # General setup
306 config ANDROID_BOOT_IMAGE
307 bool "Enable support for Android Boot Images"
308 default y if FASTBOOT
310 This enables support for booting images which use the Android
314 bool "Support Flattened Image Tree"
318 This option allows you to boot the new uImage structure,
319 Flattened Image Tree. FIT is formally a FDT, which can include
320 images of various types (kernel, FDT blob, ramdisk, etc.)
321 in a single blob. To boot this new uImage structure,
322 pass the address of the blob to the "bootm" command.
323 FIT is very flexible, supporting compression, multiple images,
324 multiple configurations, verification through hashing and also
325 verified boot (secure boot using RSA).
329 config FIT_EXTERNAL_OFFSET
330 hex "FIT external data offset"
333 This specifies a data offset in fit image.
334 The offset is from data payload offset to the beginning of
335 fit image header. When specifies a offset, specific data
336 could be put in the hole between data payload and fit image
337 header, such as CSF data on i.MX platform.
339 config FIT_ENABLE_SHA256_SUPPORT
340 bool "Support SHA256 checksum of FIT image contents"
344 Enable this to support SHA256 checksum of FIT image contents. A
345 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
346 the image contents have not been corrupted. SHA256 is recommended
347 for use in secure applications since (as at 2016) there is no known
348 feasible attack that could produce a 'collision' with differing
349 input data. Use this for the highest security. Note that only the
350 SHA256 variant is supported: SHA512 and others are not currently
354 bool "Enable signature verification of FIT uImages"
359 This option enables signature verification of FIT uImages,
360 using a hash signed and verified using RSA. If
361 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
362 hashing is available using hardware, then the RSA library will use
363 it. See doc/uImage.FIT/signature.txt for more details.
365 WARNING: When relying on signed FIT images with a required signature
366 check the legacy image format is disabled by default, so that
367 unsigned images cannot be loaded. If a board needs the legacy image
368 format support in this case, enable it using
369 CONFIG_LEGACY_IMAGE_FORMAT.
371 config FIT_SIGNATURE_MAX_SIZE
372 hex "Max size of signed FIT structures"
373 depends on FIT_SIGNATURE
376 This option sets a max size in bytes for verified FIT uImages.
377 A sane value of 256MB protects corrupted DTB structures from overlapping
378 device memory. Assure this size does not extend past expected storage
381 config FIT_ENABLE_RSASSA_PSS_SUPPORT
382 bool "Support rsassa-pss signature scheme of FIT image contents"
383 depends on FIT_SIGNATURE
386 Enable this to support the pss padding algorithm as described
387 in the rfc8017 (https://tools.ietf.org/html/rfc8017).
390 bool "Enable ciphering data in a FIT uImages"
394 Enable the feature of data ciphering/unciphering in the tool mkimage
395 and in the u-boot support of the FIT image.
398 bool "Show verbose messages when FIT images fail"
400 Generally a system will have valid FIT images so debug messages
401 are a waste of code space. If you are debugging your images then
402 you can enable this option to get more verbose information about
405 config FIT_BEST_MATCH
406 bool "Select the best match for the kernel device tree"
408 When no configuration is explicitly selected, default to the
409 one whose fdt's compatibility field best matches that of
410 U-Boot itself. A match is considered "best" if it matches the
411 most specific compatibility entry of U-Boot's fdt's root node.
412 The order of entries in the configuration's fdt is ignored.
414 config FIT_IMAGE_POST_PROCESS
415 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
416 depends on TI_SECURE_DEVICE
418 Allows doing any sort of manipulation to blobs after they got extracted
419 from FIT images like stripping off headers or modifying the size of the
420 blob, verification, authentication, decryption etc. in a platform or
421 board specific way. In order to use this feature a platform or board-
422 specific implementation of board_fit_image_post_process() must be
423 provided. Also, anything done during this post-processing step would
424 need to be comprehended in how the images were prepared before being
425 injected into the FIT creation (i.e. the blobs would have been pre-
426 processed before being added to the FIT image).
431 bool "Support Flattened Image Tree within SPL"
436 bool "Support FIT printing within SPL"
439 Support printing the content of the fitImage in a verbose manner in SPL.
441 config SPL_FIT_SIGNATURE
442 bool "Enable signature verification of FIT firmware within SPL"
448 bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
451 Normally with the SPL framework a legacy image is generated as part
452 of the build. This contains U-Boot along with information as to
453 where it should be loaded. This option instead enables generation
454 of a FIT (Flat Image Tree) which provides more flexibility. In
455 particular it can handle selecting from multiple device tree
456 and passing the correct one to U-Boot.
458 config SPL_LOAD_FIT_APPLY_OVERLAY
459 bool "Enable SPL applying DT overlays from FIT"
460 depends on SPL_LOAD_FIT
461 select OF_LIBFDT_OVERLAY
463 The device tree is loaded from the FIT image. Allow the SPL is to
464 also load device-tree overlays from the FIT image an apply them
465 over the device tree.
467 config SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
468 depends on SPL_LOAD_FIT_APPLY_OVERLAY
470 hex "size of temporary buffer used to load the overlays"
472 The size of the area where the overlays will be loaded and
473 uncompress. Must be at least as large as biggest overlay
476 config SPL_LOAD_FIT_FULL
477 bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
480 Normally with the SPL framework a legacy image is generated as part
481 of the build. This contains U-Boot along with information as to
482 where it should be loaded. This option instead enables generation
483 of a FIT (Flat Image Tree) which provides more flexibility. In
484 particular it can handle selecting from multiple device tree
485 and passing the correct one to U-Boot.
487 config SPL_FIT_IMAGE_POST_PROCESS
488 bool "Enable post-processing of FIT artifacts after loading by the SPL"
489 depends on SPL_LOAD_FIT
491 Allows doing any sort of manipulation to blobs after they got extracted
492 from the U-Boot FIT image like stripping off headers or modifying the
493 size of the blob, verification, authentication, decryption etc. in a
494 platform or board specific way. In order to use this feature a platform
495 or board-specific implementation of board_fit_image_post_process() must
496 be provided. Also, anything done during this post-processing step would
497 need to be comprehended in how the images were prepared before being
498 injected into the FIT creation (i.e. the blobs would have been pre-
499 processed before being added to the FIT image).
501 config SPL_FIT_SOURCE
502 string ".its source file for U-Boot FIT image"
505 Specifies a (platform specific) FIT source file to generate the
506 U-Boot FIT image. This could specify further image to load and/or
509 config SPL_FIT_GENERATOR
510 string ".its file generator script for U-Boot FIT image"
512 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
513 default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
514 default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
515 default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
517 Specifies a (platform specific) script file to generate the FIT
518 source file used to build the U-Boot FIT image file. This gets
519 passed a list of supported device tree file stub names to
520 include in the generated image.
526 config LEGACY_IMAGE_FORMAT
527 bool "Enable support for the legacy image format"
528 default y if !FIT_SIGNATURE
530 This option enables the legacy image format. It is enabled by
531 default for backward compatibility, unless FIT_SIGNATURE is
532 set where it is disabled so that unsigned images cannot be
533 loaded. If a board needs the legacy image format support in this
534 case, enable it here.
536 config OF_BOARD_SETUP
537 bool "Set up board-specific details in device tree before boot"
540 This causes U-Boot to call ft_board_setup() before booting into
541 the Operating System. This function can set up various
542 board-specific information in the device tree for use by the OS.
543 The device tree is then passed to the OS.
545 config OF_SYSTEM_SETUP
546 bool "Set up system-specific details in device tree before boot"
549 This causes U-Boot to call ft_system_setup() before booting into
550 the Operating System. This function can set up various
551 system-specific information in the device tree for use by the OS.
552 The device tree is then passed to the OS.
554 config OF_STDOUT_VIA_ALIAS
555 bool "Update the device-tree stdout alias from U-Boot"
558 This uses U-Boot's serial alias from the aliases node to update
559 the device tree passed to the OS. The "linux,stdout-path" property
560 in the chosen node is set to point to the correct serial node.
561 This option currently references CONFIG_CONS_INDEX, which is
562 incorrect when used with device tree as this option does not
563 exist / should not be used.
565 config SYS_EXTRA_OPTIONS
566 string "Extra Options (DEPRECATED)"
568 The old configuration infrastructure (= mkconfig + boards.cfg)
569 provided the extra options field. If you have something like
570 "HAS_BAR,BAZ=64", the optional options
572 #define CONFIG_BAZ 64
573 will be defined in include/config.h.
574 This option was prepared for the smooth migration from the old
575 configuration to Kconfig. Since this option will be removed sometime,
576 new boards should not use this option.
578 config HAVE_SYS_TEXT_BASE
580 depends on !NIOS2 && !XTENSA
585 depends on HAVE_SYS_TEXT_BASE
586 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
587 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
588 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
589 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
592 The address in memory that U-Boot will be running from, initially.
595 depends on ARC || ARCH_SUNXI || MPC83xx
596 int "CPU clock frequency"
598 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
600 config ARCH_FIXUP_FDT_MEMORY
601 bool "Enable arch_fixup_memory_banks() call"
604 Enable FDT memory map syncup before OS boot. This feature can be
605 used for booting OS with different memory setup where the part of
606 the memory location should be used for different purpose.
608 endmenu # Boot images
612 source "common/Kconfig"
616 source "disk/Kconfig"
624 source "drivers/Kconfig"
630 source "test/Kconfig"