6mainmenu "U-Boot $UBOOTVERSION Configuration"
10 option env="UBOOTVERSION"
15menu "General setup"
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.
41 bool "Automatically append version information to the version string"
42 default y
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
46 top of tree revision.
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 bool "Optimize for size"
62 default y
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"
71 depends on SANDBOX
73 Enabling this option will pass "--coverage" to gcc to compile
74 and link code instrumented for coverage analysis.
77 bool "Select defaults suitable for booting general purpose Linux distributions"
78 select AUTO_COMPLETE
79 select CMDLINE_EDITING
80 select CMD_BOOTI if ARM64
81 select CMD_BOOTZ if ARM && !ARM64
82 select CMD_DHCP if CMD_NET
83 select CMD_ENV_EXISTS
84 select CMD_EXT2
85 select CMD_EXT4
86 select CMD_FAT
87 select CMD_FS_GENERIC
88 select CMD_PART if PARTITIONS
89 select CMD_PING if CMD_NET
90 select CMD_PXE if NET
91 select CMD_SYSBOOT
92 select ENV_VARS_UBOOT_CONFIG
93 select HUSH_PARSER
94 select SUPPORT_RAW_INITRD
95 select SYS_LONGHELP
96 imply CMD_MII if NET
97 imply USB_STORAGE
98 imply USE_BOOTCOMMAND
100 Select this to enable various options and commands which are suitable
101 for building u-boot for booting general purpose Linux distributions.
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:
110 - CONFIG_SYS_ARCH
111 - CONFIG_SYS_CPU
112 - CONFIG_SYS_BOARD
113 - CONFIG_SYS_VENDOR
114 - CONFIG_SYS_SOC
117 int "Number of DRAM banks"
118 default 4
120 This defines the number of DRAM banks.
123 bool "Enable kernel command line setup"
125 Enables allocating and saving kernel cmdline in space between
126 "bootm_low" and "bootm_low" + BOOTMAPSZ.
129 bool "Enable kernel board information setup"
131 Enables allocating and saving a kernel copy of the bd_info in
132 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
135 bool "Enable malloc() pool before relocation"
136 default y if DM
139 Before relocation, memory is very limited on many platforms. Still,
140 we can provide a small malloc() pool if needed. Driver model in
141 particular needs this to operate, so that it can allocate the
142 initial serial device and any others that are needed.
145 hex "Size of malloc() pool before relocation"
146 depends on SYS_MALLOC_F
147 default 0x1000 if AM33XX
148 default 0x2800 if SANDBOX
149 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
150 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5)
151 default 0x400
153 Before relocation, memory is very limited on many platforms. Still,
154 we can provide a small malloc() pool if needed. Driver model in
155 particular needs this to operate, so that it can allocate the
156 initial serial device and any others that are needed.
159 hex "Define memory for Dynamic allocation"
160 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
161 default 0x2000000 if ARCH_ROCKCHIP
163 This defines memory to be allocated for Dynamic allocation
164 TODO: Use for other architectures
167 hex "Size of malloc() pool in SPL before relocation"
168 depends on SYS_MALLOC_F && SPL
169 default 0x2800 if RCAR_GEN3
170 default SYS_MALLOC_F_LEN
172 Before relocation, memory is very limited on many platforms. Still,
173 we can provide a small malloc() pool if needed. Driver model in
174 particular needs this to operate, so that it can allocate the
175 initial serial device and any others that are needed.
178 hex "Size of malloc() pool in TPL before relocation"
179 depends on SYS_MALLOC_F && TPL
180 default SYS_MALLOC_F_LEN
182 Before relocation, memory is very limited on many platforms. Still,
183 we can provide a small malloc() pool if needed. Driver model in
184 particular needs this to operate, so that it can allocate the
185 initial serial device and any others that are needed.
188 bool "Configure standard U-Boot features (expert users)"
189 default y
191 This option allows certain base U-Boot options and settings
192 to be disabled or tweaked. This is for specialized
193 environments which can tolerate a "non-standard" U-Boot.
194 Use this only if you really know what you are doing.
197 config SYS_MALLOC_CLEAR_ON_INIT
198 bool "Init with zeros the memory reserved for malloc (slow)"
199 default y
201 This setting is enabled by default. The reserved malloc
202 memory is initialized with zeros, so first malloc calls
203 will return the pointer to the zeroed memory. But this
204 slows the boot time.
206 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
207 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
208 Then the boot time can be significantly reduced.
210 When disabling this, please check if malloc calls, maybe
211 should be replaced by calloc - if one expects zeroed memory.
214 bool "Enable debug information for tools"
216 Enable generation of debug information for tools such as mkimage.
217 This can be used for debugging purposes. With debug information
218 it is possible to set breakpoints on particular lines, single-step
219 debug through the source code, etc.
224 bool "64bit physical address support"
226 Say Y here to support 64bit physical memory address.
227 This can be used not only for 64bit SoCs, but also for
228 large physical address extension on 32bit SoCs.
231 bool "Build U-Boot as BIOS replacement"
232 depends on X86
234 This option allows to build a ROM version of U-Boot.
235 The build process generally requires several binary blobs
236 which are not shipped in the U-Boot source tree.
237 Please, see doc/README.x86 for details.
240 string "SPL image used in the combined SPL+U-Boot image"
241 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
242 default "spl/u-boot-spl.bin"
243 depends on SPL
245 Select the SPL build target that shall be generated by the SPL
246 build process (default spl/u-boot-spl.bin). This image will be
247 used to generate a combined image with SPL and main U-Boot
248 proper as one single image.
251 string "Build target special images"
252 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
253 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
254 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
255 default "u-boot-elf.srec" if RCAR_GEN3
256 default "u-boot.itb" if SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
257 ARCH_SUNXI || RISCV)
258 default "u-boot.kwb" if KIRKWOOD
259 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
260 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
262 Some SoCs need special image types (e.g. U-Boot binary
263 with a special header) as build targets. By defining
264 CONFIG_BUILD_TARGET in the SoC / board header, this
265 special image will be automatically built upon calling
266 make / buildman.
269 bool "Use a custom location for the U-Boot linker script"
271 Normally when linking U-Boot we will look in the board directory,
272 the CPU directory and finally the "cpu" directory of the architecture
273 for the ile "u-boot.lds" and use that as our linker. However, in
274 some cases we need to provide a different linker script. To do so,
275 enable this option and then provide the location under
279 depends on SYS_CUSTOM_LDSCRIPT
280 string "Custom ldscript location"
282 Path within the source tree to the linker script to use for the
283 main U-Boot binary.
287 default 0x0
289 Some U-Boot pointers have redundant information, so we can use a
290 scheme where we can return either an error code or a pointer with the
291 same return value. The default implementation just casts the pointer
292 to a number, however, this may fail on platforms where the end of the
293 address range is used for valid pointers (e.g. 0xffffff00 is a valid
294 heap pointer in socfpga SPL).
295 For such platforms, this value provides an upper range of those error
296 pointer values - up to 'MAX_ERRNO' bytes below this value must be
297 unused/invalid addresses.
301menu "Boot images"
304 bool "Enable support for Android Boot Images"
305 default y if FASTBOOT
307 This enables support for booting images which use the Android
308 image format header.
311 bool "Support Flattened Image Tree"
312 select MD5
313 select SHA1
315 This option allows you to boot the new uImage structure,
316 Flattened Image Tree. FIT is formally a FDT, which can include
317 images of various types (kernel, FDT blob, ramdisk, etc.)
318 in a single blob. To boot this new uImage structure,
319 pass the address of the blob to the "bootm" command.
320 FIT is very flexible, supporting compression, multiple images,
321 multiple configurations, verification through hashing and also
322 verified boot (secure boot using RSA).
327 hex "FIT external data offset"
328 default 0x0
330 This specifies a data offset in fit image.
331 The offset is from data payload offset to the beginning of
332 fit image header. When specifies a offset, specific data
333 could be put in the hole between data payload and fit image
334 header, such as CSF data on i.MX platform.
337 bool "Support SHA256 checksum of FIT image contents"
338 default y
339 select SHA256
341 Enable this to support SHA256 checksum of FIT image contents. A
342 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
343 the image contents have not been corrupted. SHA256 is recommended
344 for use in secure applications since (as at 2016) there is no known
345 feasible attack that could produce a 'collision' with differing
346 input data. Use this for the highest security. Note that only the
347 SHA256 variant is supported: SHA512 and others are not currently
348 supported in U-Boot.
351 bool "Enable signature verification of FIT uImages"
352 depends on DM
353 select HASH
354 select RSA
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
369 hex "Max size of signed FIT structures"
370 depends on FIT_SIGNATURE
371 default 0x10000000
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
379 bool "Support rsassa-pss signature scheme of FIT image contents"
380 depends on FIT_SIGNATURE
381 default n
383 Enable this to support the pss padding algorithm as described
384 in the rfc8017 (https://tools.ietf.org/html/rfc8017).
387 bool "Show verbose messages when FIT images fail"
389 Generally a system will have valid FIT images so debug messages
390 are a waste of code space. If you are debugging your images then
391 you can enable this option to get more verbose information about
395 bool "Select the best match for the kernel device tree"
397 When no configuration is explicitly selected, default to the
398 one whose fdt's compatibility field best matches that of
399 U-Boot itself. A match is considered "best" if it matches the
400 most specific compatibility entry of U-Boot's fdt's root node.
401 The order of entries in the configuration's fdt is ignored.
404 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
405 depends on TI_SECURE_DEVICE
407 Allows doing any sort of manipulation to blobs after they got extracted
408 from FIT images like stripping off headers or modifying the size of the
409 blob, verification, authentication, decryption etc. in a platform or
410 board specific way. In order to use this feature a platform or board-
411 specific implementation of board_fit_image_post_process() must be
412 provided. Also, anything done during this post-processing step would
413 need to be comprehended in how the images were prepared before being
414 injected into the FIT creation (i.e. the blobs would have been pre-
415 processed before being added to the FIT image).
420 bool "Support Flattened Image Tree within SPL"
421 depends on SPL
422 select SPL_OF_LIBFDT
425 bool "Support FIT printing within SPL"
426 depends on SPL_FIT
428 Support printing the content of the fitImage in a verbose manner in SPL.
431 bool "Enable signature verification of FIT firmware within SPL"
432 depends on SPL_DM
433 select SPL_FIT
434 select SPL_RSA
437 bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
438 select SPL_FIT
440 Normally with the SPL framework a legacy image is generated as part
441 of the build. This contains U-Boot along with information as to
442 where it should be loaded. This option instead enables generation
443 of a FIT (Flat Image Tree) which provides more flexibility. In
444 particular it can handle selecting from multiple device tree
445 and passing the correct one to U-Boot.
448 bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
449 select SPL_FIT
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.
459 bool "Enable post-processing of FIT artifacts after loading by the SPL"
460 depends on SPL_LOAD_FIT
462 Allows doing any sort of manipulation to blobs after they got extracted
463 from the U-Boot FIT image like stripping off headers or modifying the
464 size of the blob, verification, authentication, decryption etc. in a
465 platform or board specific way. In order to use this feature a platform
466 or board-specific implementation of board_fit_image_post_process() must
467 be provided. Also, anything done during this post-processing step would
468 need to be comprehended in how the images were prepared before being
469 injected into the FIT creation (i.e. the blobs would have been pre-
470 processed before being added to the FIT image).
473 string ".its source file for U-Boot FIT image"
474 depends on SPL_FIT
476 Specifies a (platform specific) FIT source file to generate the
477 U-Boot FIT image. This could specify further image to load and/or
481 string ".its file generator script for U-Boot FIT image"
482 depends on SPL_FIT
483 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
484 default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
485 default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
487 Specifies a (platform specific) script file to generate the FIT
488 source file used to build the U-Boot FIT image file. This gets
489 passed a list of supported device tree file stub names to
490 include in the generated image.
497 bool "Enable support for the legacy image format"
498 default y if !FIT_SIGNATURE
500 This option enables the legacy image format. It is enabled by
501 default for backward compatibility, unless FIT_SIGNATURE is
502 set where it is disabled so that unsigned images cannot be
503 loaded. If a board needs the legacy image format support in this
504 case, enable it here.
507 bool "Set up board-specific details in device tree before boot"
508 depends on OF_LIBFDT
510 This causes U-Boot to call ft_board_setup() before booting into
511 the Operating System. This function can set up various
512 board-specific information in the device tree for use by the OS.
513 The device tree is then passed to the OS.
516 bool "Set up system-specific details in device tree before boot"
517 depends on OF_LIBFDT
519 This causes U-Boot to call ft_system_setup() before booting into
520 the Operating System. This function can set up various
521 system-specific information in the device tree for use by the OS.
522 The device tree is then passed to the OS.
525 bool "Update the device-tree stdout alias from U-Boot"
526 depends on OF_LIBFDT
528 This uses U-Boot's serial alias from the aliases node to update
529 the device tree passed to the OS. The "linux,stdout-path" property
530 in the chosen node is set to point to the correct serial node.
531 This option currently references CONFIG_CONS_INDEX, which is
532 incorrect when used with device tree as this option does not
533 exist / should not be used.
536 string "Extra Options (DEPRECATED)"
538 The old configuration infrastructure (= mkconfig + boards.cfg)
539 provided the extra options field. If you have something like
540 "HAS_BAR,BAZ=64", the optional options
541 #define CONFIG_HAS
542 #define CONFIG_BAZ 64
543 will be defined in include/config.h.
544 This option was prepared for the smooth migration from the old
545 configuration to Kconfig. Since this option will be removed sometime,
546 new boards should not use this option.
549 depends on !NIOS2 && !XTENSA
550 depends on !EFI_APP
551 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
552 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
553 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
554 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
555 hex "Text Base"
557 The address in memory that U-Boot will be running from, initially.
562 depends on ARC || ARCH_SUNXI || MPC83xx
563 int "CPU clock frequency"
565 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
568 bool "Enable arch_fixup_memory_banks() call"
569 default y
571 Enable FDT memory map syncup before OS boot. This feature can be
572 used for booting OS with different memory setup where the part of
573 the memory location should be used for different purpose.