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.
109 bool "Configure standard U-Boot features (expert users)"
112 This option allows certain base U-Boot options and settings
113 to be disabled or tweaked. This is for specialized
114 environments which can tolerate a "non-standard" U-Boot.
115 Use this only if you really know what you are doing.
118 config SYS_MALLOC_CLEAR_ON_INIT
119 bool "Init with zeros the memory reserved for malloc (slow)"
122 This setting is enabled by default. The reserved malloc
123 memory is initialized with zeros, so first malloc calls
124 will return the pointer to the zeroed memory. But this
127 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
128 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
129 Then the boot time can be significantly reduced.
131 When disabling this, please check if malloc calls, maybe
132 should be replaced by calloc - if one expects zeroed memory.
135 bool "Enable debug information for tools"
137 Enable generation of debug information for tools such as mkimage.
138 This can be used for debugging purposes. With debug information
139 it is possible to set breakpoints on particular lines, single-step
140 debug through the source code, etc.
145 bool "64bit physical address support"
147 Say Y here to support 64bit physical memory address.
148 This can be used not only for 64bit SoCs, but also for
149 large physical address extention on 32bit SoCs.
151 endmenu # General setup
156 bool "Support Flattened Image Tree"
160 This option allows you to boot the new uImage structure,
161 Flattened Image Tree. FIT is formally a FDT, which can include
162 images of various types (kernel, FDT blob, ramdisk, etc.)
163 in a single blob. To boot this new uImage structure,
164 pass the address of the blob to the "bootm" command.
165 FIT is very flexible, supporting compression, multiple images,
166 multiple configurations, verification through hashing and also
167 verified boot (secure boot using RSA).
171 config FIT_ENABLE_SHA256_SUPPORT
172 bool "Support SHA256 checksum of FIT image contents"
176 Enable this to support SHA256 checksum of FIT image contents. A
177 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
178 the image contents have not been corrupted. SHA256 is recommended
179 for use in secure applications since (as at 2016) there is no known
180 feasible attack that could produce a 'collision' with differing
181 input data. Use this for the highest security. Note that only the
182 SHA256 variant is supported: SHA512 and others are not currently
186 bool "Enable signature verification of FIT uImages"
190 This option enables signature verification of FIT uImages,
191 using a hash signed and verified using RSA. If
192 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
193 hashing is available using hardware, then the RSA library will use
194 it. See doc/uImage.FIT/signature.txt for more details.
196 WARNING: When relying on signed FIT images with a required signature
197 check the legacy image format is disabled by default, so that
198 unsigned images cannot be loaded. If a board needs the legacy image
199 format support in this case, enable it using
200 CONFIG_IMAGE_FORMAT_LEGACY.
203 bool "Show verbose messages when FIT images fail"
205 Generally a system will have valid FIT images so debug messages
206 are a waste of code space. If you are debugging your images then
207 you can enable this option to get more verbose information about
210 config FIT_BEST_MATCH
211 bool "Select the best match for the kernel device tree"
213 When no configuration is explicitly selected, default to the
214 one whose fdt's compatibility field best matches that of
215 U-Boot itself. A match is considered "best" if it matches the
216 most specific compatibility entry of U-Boot's fdt's root node.
217 The order of entries in the configuration's fdt is ignored.
219 config FIT_IMAGE_POST_PROCESS
220 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
221 depends on TI_SECURE_DEVICE
223 Allows doing any sort of manipulation to blobs after they got extracted
224 from FIT images like stripping off headers or modifying the size of the
225 blob, verification, authentication, decryption etc. in a platform or
226 board specific way. In order to use this feature a platform or board-
227 specific implementation of board_fit_image_post_process() must be
228 provided. Also, anything done during this post-processing step would
229 need to be comprehended in how the images were prepared before being
230 injected into the FIT creation (i.e. the blobs would have been pre-
231 processed before being added to the FIT image).
236 bool "Support Flattened Image Tree within SPL"
240 config SPL_FIT_SIGNATURE
241 bool "Enable signature verification of FIT firmware within SPL"
247 bool "Enable SPL loading U-Boot as a FIT"
250 Normally with the SPL framework a legacy image is generated as part
251 of the build. This contains U-Boot along with information as to
252 where it should be loaded. This option instead enables generation
253 of a FIT (Flat Image Tree) which provides more flexibility. In
254 particular it can handle selecting from multiple device tree
255 and passing the correct one to U-Boot.
257 config SPL_FIT_IMAGE_POST_PROCESS
258 bool "Enable post-processing of FIT artifacts after loading by the SPL"
259 depends on SPL_LOAD_FIT && TI_SECURE_DEVICE
261 Allows doing any sort of manipulation to blobs after they got extracted
262 from the U-Boot FIT image like stripping off headers or modifying the
263 size of the blob, verification, authentication, decryption etc. in a
264 platform or board specific way. In order to use this feature a platform
265 or board-specific implementation of board_fit_image_post_process() must
266 be provided. Also, anything done during this post-processing step would
267 need to be comprehended in how the images were prepared before being
268 injected into the FIT creation (i.e. the blobs would have been pre-
269 processed before being added to the FIT image).
271 config SPL_FIT_SOURCE
272 string ".its source file for U-Boot FIT image"
275 Specifies a (platform specific) FIT source file to generate the
276 U-Boot FIT image. This could specify further image to load and/or
279 config SPL_FIT_GENERATOR
280 string ".its file generator script for U-Boot FIT image"
282 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
284 Specifies a (platform specific) script file to generate the FIT
285 source file used to build the U-Boot FIT image file. This gets
286 passed a list of supported device tree file stub names to
287 include in the generated image.
293 config OF_BOARD_SETUP
294 bool "Set up board-specific details in device tree before boot"
297 This causes U-Boot to call ft_board_setup() before booting into
298 the Operating System. This function can set up various
299 board-specific information in the device tree for use by the OS.
300 The device tree is then passed to the OS.
302 config OF_SYSTEM_SETUP
303 bool "Set up system-specific details in device tree before boot"
306 This causes U-Boot to call ft_system_setup() before booting into
307 the Operating System. This function can set up various
308 system-specific information in the device tree for use by the OS.
309 The device tree is then passed to the OS.
311 config OF_STDOUT_VIA_ALIAS
312 bool "Update the device-tree stdout alias from U-Boot"
315 This uses U-Boot's serial alias from the aliases node to update
316 the device tree passed to the OS. The "linux,stdout-path" property
317 in the chosen node is set to point to the correct serial node.
318 This option currently references CONFIG_CONS_INDEX, which is
319 incorrect when used with device tree as this option does not
320 exist / should not be used.
322 config SYS_EXTRA_OPTIONS
323 string "Extra Options (DEPRECATED)"
325 The old configuration infrastructure (= mkconfig + boards.cfg)
326 provided the extra options field. If you have something like
327 "HAS_BAR,BAZ=64", the optional options
329 #define CONFIG_BAZ 64
330 will be defined in include/config.h.
331 This option was prepared for the smooth migration from the old
332 configuration to Kconfig. Since this option will be removed sometime,
333 new boards should not use this option.
336 depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
337 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
338 ARCH_ZYNQ || ARCH_KEYSTONE
342 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
346 depends on ARC || ARCH_SUNXI
347 int "CPU clock frequency"
349 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
351 config ARCH_FIXUP_FDT_MEMORY
352 bool "Enable arch_fixup_memory_banks() call"
355 Enable FDT memory map syncup before OS boot. This feature can be
356 used for booting OS with different memory setup where the part of
357 the memory location should be used for different purpose.
359 endmenu # Boot images
363 source "common/Kconfig"
367 source "disk/Kconfig"
373 source "drivers/Kconfig"
379 source "test/Kconfig"
381 source "scripts/Kconfig"