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.
24 string "Local version - append to U-Boot release"
26 Append an extra string to the end of your U-Boot version.
27 This will show up in your boot log, for example.
28 The string you set here will be appended after the contents of
29 any files with a filename matching localversion* in your
30 object and source tree, in that order. Your total string can
31 be a maximum of 64 characters.
33 config LOCALVERSION_AUTO
34 bool "Automatically append version information to the version string"
37 This will try to automatically determine if the current tree is a
38 release tree by looking for Git tags that belong to the current
41 A string of the format -gxxxxxxxx will be added to the localversion
42 if a Git-based tree is found. The string generated by this will be
43 appended after any matching localversion* files, and after the value
44 set in CONFIG_LOCALVERSION.
46 (The actual string used here is the first eight characters produced
47 by running the command:
49 $ git rev-parse --verify HEAD
51 which is done within the script "scripts/setlocalversion".)
53 config CC_OPTIMIZE_FOR_SIZE
54 bool "Optimize for size"
57 Enabling this option will pass "-Os" instead of "-O2" to gcc
58 resulting in a smaller U-Boot image.
60 This option is enabled by default for U-Boot.
63 bool "Enable code coverage analysis"
66 Enabling this option will pass "--coverage" to gcc to compile
67 and link code instrumented for coverage analysis.
69 config DISTRO_DEFAULTS
70 bool "Select defaults suitable for booting general purpose Linux distributions"
72 select CMDLINE_EDITING
73 select CMD_BOOTI if ARM64
74 select CMD_BOOTZ if ARM && !ARM64
75 select CMD_DHCP if CMD_NET
81 select CMD_PART if PARTITIONS
82 select CMD_PING if CMD_NET
84 select ENV_VARS_UBOOT_CONFIG
86 select SUPPORT_RAW_INITRD
91 Select this to enable various options and commands which are suitable
92 for building u-boot for booting general purpose Linux distributions.
94 config ENV_VARS_UBOOT_CONFIG
95 bool "Add arch, board, vendor and soc variables to default environment"
97 Define this in order to add variables describing the
98 U-Boot build configuration to the default environment.
99 These will be named arch, cpu, board, vendor, and soc.
100 Enabling this option will cause the following to be defined:
107 config SYS_BOOT_GET_CMDLINE
108 bool "Enable kernel command line setup"
110 Enables allocating and saving kernel cmdline in space between
111 "bootm_low" and "bootm_low" + BOOTMAPSZ.
113 config SYS_BOOT_GET_KBD
114 bool "Enable kernel board information setup"
116 Enables allocating and saving a kernel copy of the bd_info in
117 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
120 bool "Enable malloc() pool before relocation"
123 Before relocation, memory is very limited on many platforms. Still,
124 we can provide a small malloc() pool if needed. Driver model in
125 particular needs this to operate, so that it can allocate the
126 initial serial device and any others that are needed.
128 config SYS_MALLOC_F_LEN
129 hex "Size of malloc() pool before relocation"
130 depends on SYS_MALLOC_F
131 default 0x1000 if AM33XX
134 Before relocation, memory is very limited on many platforms. Still,
135 we can provide a small malloc() pool if needed. Driver model in
136 particular needs this to operate, so that it can allocate the
137 initial serial device and any others that are needed.
139 config SYS_MALLOC_LEN
140 hex "Define memory for Dynamic allocation"
143 This defines memory to be allocated for Dynamic allocation
144 TODO: Use for other architectures
146 config SPL_SYS_MALLOC_F_LEN
147 hex "Size of malloc() pool in SPL before relocation"
148 depends on SYS_MALLOC_F
149 default SYS_MALLOC_F_LEN
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 TPL_SYS_MALLOC_F_LEN
157 hex "Size of malloc() pool in TPL before relocation"
158 depends on SYS_MALLOC_F
159 default SYS_MALLOC_F_LEN
161 Before relocation, memory is very limited on many platforms. Still,
162 we can provide a small malloc() pool if needed. Driver model in
163 particular needs this to operate, so that it can allocate the
164 initial serial device and any others that are needed.
167 bool "Configure standard U-Boot features (expert users)"
170 This option allows certain base U-Boot options and settings
171 to be disabled or tweaked. This is for specialized
172 environments which can tolerate a "non-standard" U-Boot.
173 Use this only if you really know what you are doing.
176 config SYS_MALLOC_CLEAR_ON_INIT
177 bool "Init with zeros the memory reserved for malloc (slow)"
180 This setting is enabled by default. The reserved malloc
181 memory is initialized with zeros, so first malloc calls
182 will return the pointer to the zeroed memory. But this
185 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
186 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
187 Then the boot time can be significantly reduced.
189 When disabling this, please check if malloc calls, maybe
190 should be replaced by calloc - if one expects zeroed memory.
193 bool "Enable debug information for tools"
195 Enable generation of debug information for tools such as mkimage.
196 This can be used for debugging purposes. With debug information
197 it is possible to set breakpoints on particular lines, single-step
198 debug through the source code, etc.
203 bool "64bit physical address support"
205 Say Y here to support 64bit physical memory address.
206 This can be used not only for 64bit SoCs, but also for
207 large physical address extention on 32bit SoCs.
210 bool "Build U-Boot as BIOS replacement"
213 This option allows to build a ROM version of U-Boot.
214 The build process generally requires several binary blobs
215 which are not shipped in the U-Boot source tree.
216 Please, see doc/README.x86 for details.
218 endmenu # General setup
222 config ANDROID_BOOT_IMAGE
223 bool "Enable support for Android Boot Images"
224 default y if FASTBOOT
226 This enables support for booting images which use the Android
230 bool "Support Flattened Image Tree"
234 This option allows you to boot the new uImage structure,
235 Flattened Image Tree. FIT is formally a FDT, which can include
236 images of various types (kernel, FDT blob, ramdisk, etc.)
237 in a single blob. To boot this new uImage structure,
238 pass the address of the blob to the "bootm" command.
239 FIT is very flexible, supporting compression, multiple images,
240 multiple configurations, verification through hashing and also
241 verified boot (secure boot using RSA).
245 config FIT_ENABLE_SHA256_SUPPORT
246 bool "Support SHA256 checksum of FIT image contents"
250 Enable this to support SHA256 checksum of FIT image contents. A
251 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
252 the image contents have not been corrupted. SHA256 is recommended
253 for use in secure applications since (as at 2016) there is no known
254 feasible attack that could produce a 'collision' with differing
255 input data. Use this for the highest security. Note that only the
256 SHA256 variant is supported: SHA512 and others are not currently
260 bool "Enable signature verification of FIT uImages"
265 This option enables signature verification of FIT uImages,
266 using a hash signed and verified using RSA. If
267 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
268 hashing is available using hardware, then the RSA library will use
269 it. See doc/uImage.FIT/signature.txt for more details.
271 WARNING: When relying on signed FIT images with a required signature
272 check the legacy image format is disabled by default, so that
273 unsigned images cannot be loaded. If a board needs the legacy image
274 format support in this case, enable it using
275 CONFIG_IMAGE_FORMAT_LEGACY.
277 config FIT_SIGNATURE_MAX_SIZE
278 hex "Max size of signed FIT structures"
279 depends on FIT_SIGNATURE
282 This option sets a max size in bytes for verified FIT uImages.
283 A sane value of 256MB protects corrupted DTB structures from overlapping
284 device memory. Assure this size does not extend past expected storage
288 bool "Show verbose messages when FIT images fail"
290 Generally a system will have valid FIT images so debug messages
291 are a waste of code space. If you are debugging your images then
292 you can enable this option to get more verbose information about
295 config FIT_BEST_MATCH
296 bool "Select the best match for the kernel device tree"
298 When no configuration is explicitly selected, default to the
299 one whose fdt's compatibility field best matches that of
300 U-Boot itself. A match is considered "best" if it matches the
301 most specific compatibility entry of U-Boot's fdt's root node.
302 The order of entries in the configuration's fdt is ignored.
304 config FIT_IMAGE_POST_PROCESS
305 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
306 depends on TI_SECURE_DEVICE
308 Allows doing any sort of manipulation to blobs after they got extracted
309 from FIT images like stripping off headers or modifying the size of the
310 blob, verification, authentication, decryption etc. in a platform or
311 board specific way. In order to use this feature a platform or board-
312 specific implementation of board_fit_image_post_process() must be
313 provided. Also, anything done during this post-processing step would
314 need to be comprehended in how the images were prepared before being
315 injected into the FIT creation (i.e. the blobs would have been pre-
316 processed before being added to the FIT image).
321 bool "Support Flattened Image Tree within SPL"
326 bool "Support FIT printing within SPL"
329 Support printing the content of the fitImage in a verbose manner in SPL.
331 config SPL_FIT_SIGNATURE
332 bool "Enable signature verification of FIT firmware within SPL"
338 bool "Enable SPL loading U-Boot as a FIT"
341 Normally with the SPL framework a legacy image is generated as part
342 of the build. This contains U-Boot along with information as to
343 where it should be loaded. This option instead enables generation
344 of a FIT (Flat Image Tree) which provides more flexibility. In
345 particular it can handle selecting from multiple device tree
346 and passing the correct one to U-Boot.
348 config SPL_LOAD_FIT_FULL
349 bool "Enable SPL loading U-Boot as a FIT"
352 Normally with the SPL framework a legacy image is generated as part
353 of the build. This contains U-Boot along with information as to
354 where it should be loaded. This option instead enables generation
355 of a FIT (Flat Image Tree) which provides more flexibility. In
356 particular it can handle selecting from multiple device tree
357 and passing the correct one to U-Boot.
359 config SPL_FIT_IMAGE_POST_PROCESS
360 bool "Enable post-processing of FIT artifacts after loading by the SPL"
361 depends on SPL_LOAD_FIT
363 Allows doing any sort of manipulation to blobs after they got extracted
364 from the U-Boot FIT image like stripping off headers or modifying the
365 size of the blob, verification, authentication, decryption etc. in a
366 platform or board specific way. In order to use this feature a platform
367 or board-specific implementation of board_fit_image_post_process() must
368 be provided. Also, anything done during this post-processing step would
369 need to be comprehended in how the images were prepared before being
370 injected into the FIT creation (i.e. the blobs would have been pre-
371 processed before being added to the FIT image).
373 config SPL_FIT_SOURCE
374 string ".its source file for U-Boot FIT image"
377 Specifies a (platform specific) FIT source file to generate the
378 U-Boot FIT image. This could specify further image to load and/or
381 config SPL_FIT_GENERATOR
382 string ".its file generator script for U-Boot FIT image"
384 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
386 Specifies a (platform specific) script file to generate the FIT
387 source file used to build the U-Boot FIT image file. This gets
388 passed a list of supported device tree file stub names to
389 include in the generated image.
395 config IMAGE_FORMAT_LEGACY
396 bool "Enable support for the legacy image format"
397 default y if !FIT_SIGNATURE
399 This option enables the legacy image format. It is enabled by
400 default for backward compatibility, unless FIT_SIGNATURE is
401 set where it is disabled so that unsigned images cannot be
402 loaded. If a board needs the legacy image format support in this
403 case, enable it here.
405 config OF_BOARD_SETUP
406 bool "Set up board-specific details in device tree before boot"
409 This causes U-Boot to call ft_board_setup() before booting into
410 the Operating System. This function can set up various
411 board-specific information in the device tree for use by the OS.
412 The device tree is then passed to the OS.
414 config OF_SYSTEM_SETUP
415 bool "Set up system-specific details in device tree before boot"
418 This causes U-Boot to call ft_system_setup() before booting into
419 the Operating System. This function can set up various
420 system-specific information in the device tree for use by the OS.
421 The device tree is then passed to the OS.
423 config OF_STDOUT_VIA_ALIAS
424 bool "Update the device-tree stdout alias from U-Boot"
427 This uses U-Boot's serial alias from the aliases node to update
428 the device tree passed to the OS. The "linux,stdout-path" property
429 in the chosen node is set to point to the correct serial node.
430 This option currently references CONFIG_CONS_INDEX, which is
431 incorrect when used with device tree as this option does not
432 exist / should not be used.
434 config SYS_EXTRA_OPTIONS
435 string "Extra Options (DEPRECATED)"
437 The old configuration infrastructure (= mkconfig + boards.cfg)
438 provided the extra options field. If you have something like
439 "HAS_BAR,BAZ=64", the optional options
441 #define CONFIG_BAZ 64
442 will be defined in include/config.h.
443 This option was prepared for the smooth migration from the old
444 configuration to Kconfig. Since this option will be removed sometime,
445 new boards should not use this option.
448 depends on !NIOS2 && !XTENSA
450 default 0x80800000 if ARCH_OMAP2PLUS
451 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
452 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
453 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
456 The address in memory that U-Boot will be running from, initially.
461 depends on ARC || ARCH_SUNXI
462 int "CPU clock frequency"
464 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
466 config ARCH_FIXUP_FDT_MEMORY
467 bool "Enable arch_fixup_memory_banks() call"
470 Enable FDT memory map syncup before OS boot. This feature can be
471 used for booting OS with different memory setup where the part of
472 the memory location should be used for different purpose.
474 endmenu # Boot images
478 source "common/Kconfig"
482 source "disk/Kconfig"
490 source "drivers/Kconfig"
496 source "test/Kconfig"