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
70 Select this to enable various options and commands which are suitable
71 for building u-boot for booting general purpose Linux distributions.
74 bool "Enable malloc() pool before relocation"
77 Before relocation, memory is very limited on many platforms. Still,
78 we can provide a small malloc() pool if needed. Driver model in
79 particular needs this to operate, so that it can allocate the
80 initial serial device and any others that are needed.
82 config SYS_MALLOC_F_LEN
83 hex "Size of malloc() pool before relocation"
84 depends on SYS_MALLOC_F
87 Before relocation, memory is very limited on many platforms. Still,
88 we can provide a small malloc() pool if needed. Driver model in
89 particular needs this to operate, so that it can allocate the
90 initial serial device and any others that are needed.
93 bool "Configure standard U-Boot features (expert users)"
96 This option allows certain base U-Boot options and settings
97 to be disabled or tweaked. This is for specialized
98 environments which can tolerate a "non-standard" U-Boot.
99 Use this only if you really know what you are doing.
102 config SYS_MALLOC_CLEAR_ON_INIT
103 bool "Init with zeros the memory reserved for malloc (slow)"
106 This setting is enabled by default. The reserved malloc
107 memory is initialized with zeros, so first malloc calls
108 will return the pointer to the zeroed memory. But this
111 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
112 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
113 Then the boot time can be significantly reduced.
115 When disabling this, please check if malloc calls, maybe
116 should be replaced by calloc - if one expects zeroed memory.
118 endmenu # General setup
130 depends on SUPPORT_SPL
133 If you want to build SPL as well as the normal image, say Y.
135 config SPL_SYS_MALLOC_SIMPLE
138 prompt "Only use malloc_simple functions in the SPL"
140 Say Y here to only use the *_simple malloc functions from
141 malloc_simple.c, rather then using the versions from dlmalloc.c;
142 this will make the SPL binary smaller at the cost of more heap
143 usage as the *_simple malloc functions do not re-use free-ed mem.
147 bool "Enable SDRAM location for SPL stack"
149 SPL starts off execution in SRAM and thus typically has only a small
150 stack available. Since SPL sets up DRAM while in its board_init_f()
151 function, it is possible for the stack to move there before
152 board_init_r() is reached. This option enables a special SDRAM
153 location for the SPL stack. U-Boot SPL switches to this after
154 board_init_f() completes, and before board_init_r() starts.
156 config SPL_STACK_R_ADDR
157 depends on SPL_STACK_R
158 hex "SDRAM location for SPL stack"
160 Specify the address in SDRAM for the SPL stack. This will be set up
161 before board_init_r() is called.
163 config SPL_STACK_R_MALLOC_SIMPLE_LEN
164 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
165 hex "Size of malloc_simple heap after switching to DRAM SPL stack"
168 Specify the amount of the stack to use as memory pool for
169 malloc_simple after switching the stack to DRAM. This may be set
170 to give board_init_r() a larger heap then the initial heap in
171 SRAM which is limited to SYS_MALLOC_F_LEN bytes.
173 config SPL_SEPARATE_BSS
175 bool "BSS section is in a different memory region from text"
177 Some platforms need a large BSS region in SPL and can provide this
178 because RAM is already set up. In this case BSS can be moved to RAM.
179 This option should then be enabled so that the correct device tree
180 location is used. Normally we put the device tree at the end of BSS
181 but with this option enabled, it goes at _image_binary_end.
185 depends on SPL && SUPPORT_TPL
188 If you want to build TPL as well as the normal image and SPL, say Y.
191 bool "Support Flattened Image Tree"
193 This option allows to boot the new uImage structrure,
194 Flattened Image Tree. FIT is formally a FDT, which can include
195 images of various types (kernel, FDT blob, ramdisk, etc.)
196 in a single blob. To boot this new uImage structure,
197 pass the address of the blob to the "bootm" command.
198 FIT is very flexible, supporting compression, multiple images,
199 multiple configurations, verification through hashing and also
200 verified boot (secure boot using RSA). This option enables that
204 bool "Support Flattened Image Tree within SPL"
209 bool "Display verbose messages on FIT boot"
213 bool "Enable signature verification of FIT uImages"
218 This option enables signature verification of FIT uImages,
219 using a hash signed and verified using RSA. If
220 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
221 hashing is available using hardware, then then RSA library will use
222 it. See doc/uImage.FIT/signature.txt for more details.
224 WARNING: When relying on signed FIT images with a required signature
225 check the legacy image format is disabled by default, so that
226 unsigned images cannot be loaded. If a board needs the legacy image
227 format support in this case, enable it using
228 CONFIG_IMAGE_FORMAT_LEGACY.
230 config SPL_FIT_SIGNATURE
231 bool "Enable signature verification of FIT firmware within SPL"
236 config FIT_BEST_MATCH
237 bool "Select the best match for the kernel device tree"
240 When no configuration is explicitly selected, default to the
241 one whose fdt's compatibility field best matches that of
242 U-Boot itself. A match is considered "best" if it matches the
243 most specific compatibility entry of U-Boot's fdt's root node.
244 The order of entries in the configuration's fdt is ignored.
247 bool "Show verbose messages when FIT images fails"
250 Generally a system will have valid FIT images so debug messages
251 are a waste of code space. If you are debugging your images then
252 you can enable this option to get more verbose information about
255 config OF_BOARD_SETUP
256 bool "Set up board-specific details in device tree before boot"
259 This causes U-Boot to call ft_board_setup() before booting into
260 the Operating System. This function can set up various
261 board-specific information in the device tree for use by the OS.
262 The device tree is then passed to the OS.
264 config OF_SYSTEM_SETUP
265 bool "Set up system-specific details in device tree before boot"
268 This causes U-Boot to call ft_system_setup() before booting into
269 the Operating System. This function can set up various
270 system-specific information in the device tree for use by the OS.
271 The device tree is then passed to the OS.
273 config OF_STDOUT_VIA_ALIAS
274 bool "Update the device-tree stdout alias from U-Boot"
277 This uses U-Boot's serial alias from the aliases node to update
278 the device tree passed to the OS. The "linux,stdout-path" property
279 in the chosen node is set to point to the correct serial node.
280 This option currently references CONFIG_CONS_INDEX, which is
281 incorrect when used with device tree as this option does not
282 exist / should not be used.
284 config SYS_EXTRA_OPTIONS
285 string "Extra Options (DEPRECATED)"
287 The old configuration infrastructure (= mkconfig + boards.cfg)
288 provided the extra options field. If you have something like
289 "HAS_BAR,BAZ=64", the optional options
291 #define CONFIG_BAZ 64
292 will be defined in include/config.h.
293 This option was prepared for the smooth migration from the old
294 configuration to Kconfig. Since this option will be removed sometime,
295 new boards should not use this option.
298 depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
299 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
303 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
306 bool "Enable SPL loading U-Boot as a FIT"
309 Normally with the SPL framework a legacy image is generated as part
310 of the build. This contains U-Boot along with information as to
311 where it should be loaded. This option instead enables generation
312 of a FIT (Flat Image Tree) which provides more flexibility. In
313 particular it can handle selecting from multiple device tree
314 and passing the correct one to U-Boot.
317 depends on ARC || ARCH_SUNXI
318 int "CPU clock frequency"
320 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
322 endmenu # Boot images
324 source "common/Kconfig"
332 source "drivers/Kconfig"
338 source "test/Kconfig"