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
18 string "Local version - append to U-Boot release"
20 Append an extra string to the end of your U-Boot version.
21 This will show up in your boot log, for example.
22 The string you set here will be appended after the contents of
23 any files with a filename matching localversion* in your
24 object and source tree, in that order. Your total string can
25 be a maximum of 64 characters.
27 config LOCALVERSION_AUTO
28 bool "Automatically append version information to the version string"
31 This will try to automatically determine if the current tree is a
32 release tree by looking for Git tags that belong to the current
35 A string of the format -gxxxxxxxx will be added to the localversion
36 if a Git-based tree is found. The string generated by this will be
37 appended after any matching localversion* files, and after the value
38 set in CONFIG_LOCALVERSION.
40 (The actual string used here is the first eight characters produced
41 by running the command:
43 $ git rev-parse --verify HEAD
45 which is done within the script "scripts/setlocalversion".)
47 config CC_OPTIMIZE_FOR_SIZE
48 bool "Optimize for size"
51 Enabling this option will pass "-Os" instead of "-O2" to gcc
52 resulting in a smaller U-Boot image.
54 This option is enabled by default for U-Boot.
56 config DISTRO_DEFAULTS
57 bool "Select defaults suitable for booting general purpose Linux distributions"
58 default y if ARCH_SUNXI || TEGRA
59 default y if ARCH_LS2080A
60 default y if ARCH_MESON
61 default y if ARCH_ROCKCHIP
63 select CMD_BOOTZ if ARM && !ARM64
64 select CMD_BOOTI if ARM64
76 Select this to enable various options and commands which are suitable
77 for building u-boot for booting general purpose Linux distributions.
80 bool "Enable malloc() pool before relocation"
83 Before relocation, memory is very limited on many platforms. Still,
84 we can provide a small malloc() pool if needed. Driver model in
85 particular needs this to operate, so that it can allocate the
86 initial serial device and any others that are needed.
88 config SYS_MALLOC_F_LEN
89 hex "Size of malloc() pool before relocation"
90 depends on SYS_MALLOC_F
93 Before relocation, memory is very limited on many platforms. Still,
94 we can provide a small malloc() pool if needed. Driver model in
95 particular needs this to operate, so that it can allocate the
96 initial serial device and any others that are needed.
98 config SPL_SYS_MALLOC_F_LEN
99 hex "Size of malloc() pool in SPL before relocation"
100 depends on SYS_MALLOC_F
101 default SYS_MALLOC_F_LEN
103 Before relocation, memory is very limited on many platforms. Still,
104 we can provide a small malloc() pool if needed. Driver model in
105 particular needs this to operate, so that it can allocate the
106 initial serial device and any others that are needed.
108 config TPL_SYS_MALLOC_F_LEN
109 hex "Size of malloc() pool in TPL before relocation"
110 depends on SYS_MALLOC_F
111 default SYS_MALLOC_F_LEN
113 Before relocation, memory is very limited on many platforms. Still,
114 we can provide a small malloc() pool if needed. Driver model in
115 particular needs this to operate, so that it can allocate the
116 initial serial device and any others that are needed.
119 bool "Configure standard U-Boot features (expert users)"
122 This option allows certain base U-Boot options and settings
123 to be disabled or tweaked. This is for specialized
124 environments which can tolerate a "non-standard" U-Boot.
125 Use this only if you really know what you are doing.
128 config SYS_MALLOC_CLEAR_ON_INIT
129 bool "Init with zeros the memory reserved for malloc (slow)"
132 This setting is enabled by default. The reserved malloc
133 memory is initialized with zeros, so first malloc calls
134 will return the pointer to the zeroed memory. But this
137 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
138 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
139 Then the boot time can be significantly reduced.
141 When disabling this, please check if malloc calls, maybe
142 should be replaced by calloc - if one expects zeroed memory.
145 bool "Enable debug information for tools"
147 Enable generation of debug information for tools such as mkimage.
148 This can be used for debugging purposes. With debug information
149 it is possible to set breakpoints on particular lines, single-step
150 debug through the source code, etc.
155 bool "64bit physical address support"
157 Say Y here to support 64bit physical memory address.
158 This can be used not only for 64bit SoCs, but also for
159 large physical address extention on 32bit SoCs.
162 bool "Build U-Boot as BIOS replacement"
165 This option allows to build a ROM version of U-Boot.
166 The build process generally requires several binary blobs
167 which are not shipped in the U-Boot source tree.
168 Please, see doc/README.x86 for details.
170 endmenu # General setup
174 config ANDROID_BOOT_IMAGE
175 bool "Enable support for Android Boot Images"
176 default y if FASTBOOT
178 This enables support for booting images which use the Android
182 bool "Support Flattened Image Tree"
186 This option allows you to boot the new uImage structure,
187 Flattened Image Tree. FIT is formally a FDT, which can include
188 images of various types (kernel, FDT blob, ramdisk, etc.)
189 in a single blob. To boot this new uImage structure,
190 pass the address of the blob to the "bootm" command.
191 FIT is very flexible, supporting compression, multiple images,
192 multiple configurations, verification through hashing and also
193 verified boot (secure boot using RSA).
197 config FIT_ENABLE_SHA256_SUPPORT
198 bool "Support SHA256 checksum of FIT image contents"
202 Enable this to support SHA256 checksum of FIT image contents. A
203 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
204 the image contents have not been corrupted. SHA256 is recommended
205 for use in secure applications since (as at 2016) there is no known
206 feasible attack that could produce a 'collision' with differing
207 input data. Use this for the highest security. Note that only the
208 SHA256 variant is supported: SHA512 and others are not currently
212 bool "Enable signature verification of FIT uImages"
216 This option enables signature verification of FIT uImages,
217 using a hash signed and verified using RSA. If
218 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
219 hashing is available using hardware, then the RSA library will use
220 it. See doc/uImage.FIT/signature.txt for more details.
222 WARNING: When relying on signed FIT images with a required signature
223 check the legacy image format is disabled by default, so that
224 unsigned images cannot be loaded. If a board needs the legacy image
225 format support in this case, enable it using
226 CONFIG_IMAGE_FORMAT_LEGACY.
229 bool "Show verbose messages when FIT images fail"
231 Generally a system will have valid FIT images so debug messages
232 are a waste of code space. If you are debugging your images then
233 you can enable this option to get more verbose information about
236 config FIT_BEST_MATCH
237 bool "Select the best match for the kernel device tree"
239 When no configuration is explicitly selected, default to the
240 one whose fdt's compatibility field best matches that of
241 U-Boot itself. A match is considered "best" if it matches the
242 most specific compatibility entry of U-Boot's fdt's root node.
243 The order of entries in the configuration's fdt is ignored.
245 config FIT_IMAGE_POST_PROCESS
246 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
247 depends on TI_SECURE_DEVICE
249 Allows doing any sort of manipulation to blobs after they got extracted
250 from FIT images like stripping off headers or modifying the size of the
251 blob, verification, authentication, decryption etc. in a platform or
252 board specific way. In order to use this feature a platform or board-
253 specific implementation of board_fit_image_post_process() must be
254 provided. Also, anything done during this post-processing step would
255 need to be comprehended in how the images were prepared before being
256 injected into the FIT creation (i.e. the blobs would have been pre-
257 processed before being added to the FIT image).
262 bool "Support Flattened Image Tree within SPL"
266 config SPL_FIT_SIGNATURE
267 bool "Enable signature verification of FIT firmware within SPL"
273 bool "Enable SPL loading U-Boot as a FIT"
276 Normally with the SPL framework a legacy image is generated as part
277 of the build. This contains U-Boot along with information as to
278 where it should be loaded. This option instead enables generation
279 of a FIT (Flat Image Tree) which provides more flexibility. In
280 particular it can handle selecting from multiple device tree
281 and passing the correct one to U-Boot.
283 config SPL_FIT_IMAGE_POST_PROCESS
284 bool "Enable post-processing of FIT artifacts after loading by the SPL"
285 depends on SPL_LOAD_FIT
287 Allows doing any sort of manipulation to blobs after they got extracted
288 from the U-Boot FIT image like stripping off headers or modifying the
289 size of the blob, verification, authentication, decryption etc. in a
290 platform or board specific way. In order to use this feature a platform
291 or board-specific implementation of board_fit_image_post_process() must
292 be provided. Also, anything done during this post-processing step would
293 need to be comprehended in how the images were prepared before being
294 injected into the FIT creation (i.e. the blobs would have been pre-
295 processed before being added to the FIT image).
297 config SPL_FIT_SOURCE
298 string ".its source file for U-Boot FIT image"
301 Specifies a (platform specific) FIT source file to generate the
302 U-Boot FIT image. This could specify further image to load and/or
305 config SPL_FIT_GENERATOR
306 string ".its file generator script for U-Boot FIT image"
308 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
310 Specifies a (platform specific) script file to generate the FIT
311 source file used to build the U-Boot FIT image file. This gets
312 passed a list of supported device tree file stub names to
313 include in the generated image.
319 config OF_BOARD_SETUP
320 bool "Set up board-specific details in device tree before boot"
323 This causes U-Boot to call ft_board_setup() before booting into
324 the Operating System. This function can set up various
325 board-specific information in the device tree for use by the OS.
326 The device tree is then passed to the OS.
328 config OF_SYSTEM_SETUP
329 bool "Set up system-specific details in device tree before boot"
332 This causes U-Boot to call ft_system_setup() before booting into
333 the Operating System. This function can set up various
334 system-specific information in the device tree for use by the OS.
335 The device tree is then passed to the OS.
337 config OF_STDOUT_VIA_ALIAS
338 bool "Update the device-tree stdout alias from U-Boot"
341 This uses U-Boot's serial alias from the aliases node to update
342 the device tree passed to the OS. The "linux,stdout-path" property
343 in the chosen node is set to point to the correct serial node.
344 This option currently references CONFIG_CONS_INDEX, which is
345 incorrect when used with device tree as this option does not
346 exist / should not be used.
348 config SYS_EXTRA_OPTIONS
349 string "Extra Options (DEPRECATED)"
351 The old configuration infrastructure (= mkconfig + boards.cfg)
352 provided the extra options field. If you have something like
353 "HAS_BAR,BAZ=64", the optional options
355 #define CONFIG_BAZ 64
356 will be defined in include/config.h.
357 This option was prepared for the smooth migration from the old
358 configuration to Kconfig. Since this option will be removed sometime,
359 new boards should not use this option.
362 depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
363 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
364 ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS
368 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
370 default 0x80800000 if ARCH_OMAP2PLUS
374 depends on ARC || ARCH_SUNXI
375 int "CPU clock frequency"
377 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
379 config ARCH_FIXUP_FDT_MEMORY
380 bool "Enable arch_fixup_memory_banks() call"
383 Enable FDT memory map syncup before OS boot. This feature can be
384 used for booting OS with different memory setup where the part of
385 the memory location should be used for different purpose.
387 endmenu # Boot images
391 source "common/Kconfig"
395 source "disk/Kconfig"
403 source "drivers/Kconfig"
409 source "test/Kconfig"