1# 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. 5# 6mainmenu "U-Boot $UBOOTVERSION Configuration" 7 8config UBOOTVERSION 9 string 10 option env="UBOOTVERSION" 11 12# Allow defaults in arch-specific code to override any given here 13source "arch/Kconfig" 14 15menu "General setup" 16 17config LOCALVERSION 18 string "Local version - append to U-Boot release" 19 help 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. 26 27config LOCALVERSION_AUTO 28 bool "Automatically append version information to the version string" 29 default y 30 help 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 33 top of tree revision. 34 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. 39 40 (The actual string used here is the first eight characters produced 41 by running the command: 42 43 $ git rev-parse --verify HEAD 44 45 which is done within the script "scripts/setlocalversion".) 46 47config CC_OPTIMIZE_FOR_SIZE 48 bool "Optimize for size" 49 default y 50 help 51 Enabling this option will pass "-Os" instead of "-O2" to gcc 52 resulting in a smaller U-Boot image. 53 54 This option is enabled by default for U-Boot. 55 56config DISTRO_DEFAULTS 57 bool "Select defaults suitable for booting general purpose Linux distributions" 58 default y if ARCH_SUNXI 59 default n 60 select CMD_BOOTZ 61 select CMD_DHCP 62 select CMD_EXT2 63 select CMD_EXT4 64 select CMD_FAT 65 select CMD_FS_GENERIC 66 select CMD_MII 67 select CMD_PING 68 select HUSH_PARSER 69 help 70 Select this to enable various options and commands which are suitable 71 for building u-boot for booting general purpose Linux distributions. 72 73config SYS_MALLOC_F 74 bool "Enable malloc() pool before relocation" 75 default y if DM 76 help 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. 81 82config SYS_MALLOC_F_LEN 83 hex "Size of malloc() pool before relocation" 84 depends on SYS_MALLOC_F 85 default 0x400 86 help 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. 91 92menuconfig EXPERT 93 bool "Configure standard U-Boot features (expert users)" 94 default y 95 help 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. 100 101if EXPERT 102 config SYS_MALLOC_CLEAR_ON_INIT 103 bool "Init with zeros the memory reserved for malloc (slow)" 104 default y 105 help 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 109 slows the boot time. 110 111 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. 114 Warning: 115 When disabling this, please check if malloc calls, maybe 116 should be replaced by calloc - if one expects zeroed memory. 117 118config TOOLS_DEBUG 119 bool "Enable debug information for tools" 120 help 121 Enable generation of debug information for tools such as mkimage. 122 This can be used for debugging purposes. With debug information 123 it is possible to set breakpoints on particular lines, single-step 124 debug through the source code, etc. 125 126endif 127endmenu # General setup 128 129menu "Boot images" 130 131config SUPPORT_SPL 132 bool 133 134config SUPPORT_TPL 135 bool 136 137config SPL 138 bool 139 depends on SUPPORT_SPL 140 prompt "Enable SPL" 141 help 142 If you want to build SPL as well as the normal image, say Y. 143 144config SPL_SYS_MALLOC_SIMPLE 145 bool 146 depends on SPL 147 prompt "Only use malloc_simple functions in the SPL" 148 help 149 Say Y here to only use the *_simple malloc functions from 150 malloc_simple.c, rather then using the versions from dlmalloc.c; 151 this will make the SPL binary smaller at the cost of more heap 152 usage as the *_simple malloc functions do not re-use free-ed mem. 153 154config SPL_STACK_R 155 depends on SPL 156 bool "Enable SDRAM location for SPL stack" 157 help 158 SPL starts off execution in SRAM and thus typically has only a small 159 stack available. Since SPL sets up DRAM while in its board_init_f() 160 function, it is possible for the stack to move there before 161 board_init_r() is reached. This option enables a special SDRAM 162 location for the SPL stack. U-Boot SPL switches to this after 163 board_init_f() completes, and before board_init_r() starts. 164 165config SPL_STACK_R_ADDR 166 depends on SPL_STACK_R 167 hex "SDRAM location for SPL stack" 168 help 169 Specify the address in SDRAM for the SPL stack. This will be set up 170 before board_init_r() is called. 171 172config SPL_STACK_R_MALLOC_SIMPLE_LEN 173 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE 174 hex "Size of malloc_simple heap after switching to DRAM SPL stack" 175 default 0x100000 176 help 177 Specify the amount of the stack to use as memory pool for 178 malloc_simple after switching the stack to DRAM. This may be set 179 to give board_init_r() a larger heap then the initial heap in 180 SRAM which is limited to SYS_MALLOC_F_LEN bytes. 181 182config SPL_SEPARATE_BSS 183 depends on SPL 184 bool "BSS section is in a different memory region from text" 185 help 186 Some platforms need a large BSS region in SPL and can provide this 187 because RAM is already set up. In this case BSS can be moved to RAM. 188 This option should then be enabled so that the correct device tree 189 location is used. Normally we put the device tree at the end of BSS 190 but with this option enabled, it goes at _image_binary_end. 191 192config TPL 193 bool 194 depends on SPL && SUPPORT_TPL 195 prompt "Enable TPL" 196 help 197 If you want to build TPL as well as the normal image and SPL, say Y. 198 199config FIT 200 bool "Support Flattened Image Tree" 201 help 202 This option allows to boot the new uImage structrure, 203 Flattened Image Tree. FIT is formally a FDT, which can include 204 images of various types (kernel, FDT blob, ramdisk, etc.) 205 in a single blob. To boot this new uImage structure, 206 pass the address of the blob to the "bootm" command. 207 FIT is very flexible, supporting compression, multiple images, 208 multiple configurations, verification through hashing and also 209 verified boot (secure boot using RSA). This option enables that 210 feature. 211 212config SPL_FIT 213 bool "Support Flattened Image Tree within SPL" 214 depends on FIT 215 depends on SPL 216 217config FIT_VERBOSE 218 bool "Display verbose messages on FIT boot" 219 depends on FIT 220 221config FIT_SIGNATURE 222 bool "Enable signature verification of FIT uImages" 223 depends on FIT 224 depends on DM 225 select RSA 226 help 227 This option enables signature verification of FIT uImages, 228 using a hash signed and verified using RSA. If 229 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive 230 hashing is available using hardware, then then RSA library will use 231 it. See doc/uImage.FIT/signature.txt for more details. 232 233 WARNING: When relying on signed FIT images with a required signature 234 check the legacy image format is disabled by default, so that 235 unsigned images cannot be loaded. If a board needs the legacy image 236 format support in this case, enable it using 237 CONFIG_IMAGE_FORMAT_LEGACY. 238 239config SPL_FIT_SIGNATURE 240 bool "Enable signature verification of FIT firmware within SPL" 241 depends on SPL_FIT 242 depends on SPL_DM 243 select SPL_RSA 244 245config FIT_BEST_MATCH 246 bool "Select the best match for the kernel device tree" 247 depends on FIT 248 help 249 When no configuration is explicitly selected, default to the 250 one whose fdt's compatibility field best matches that of 251 U-Boot itself. A match is considered "best" if it matches the 252 most specific compatibility entry of U-Boot's fdt's root node. 253 The order of entries in the configuration's fdt is ignored. 254 255config FIT_VERBOSE 256 bool "Show verbose messages when FIT images fails" 257 depends on FIT 258 help 259 Generally a system will have valid FIT images so debug messages 260 are a waste of code space. If you are debugging your images then 261 you can enable this option to get more verbose information about 262 failures. 263 264config OF_BOARD_SETUP 265 bool "Set up board-specific details in device tree before boot" 266 depends on OF_LIBFDT 267 help 268 This causes U-Boot to call ft_board_setup() before booting into 269 the Operating System. This function can set up various 270 board-specific information in the device tree for use by the OS. 271 The device tree is then passed to the OS. 272 273config OF_SYSTEM_SETUP 274 bool "Set up system-specific details in device tree before boot" 275 depends on OF_LIBFDT 276 help 277 This causes U-Boot to call ft_system_setup() before booting into 278 the Operating System. This function can set up various 279 system-specific information in the device tree for use by the OS. 280 The device tree is then passed to the OS. 281 282config OF_STDOUT_VIA_ALIAS 283 bool "Update the device-tree stdout alias from U-Boot" 284 depends on OF_LIBFDT 285 help 286 This uses U-Boot's serial alias from the aliases node to update 287 the device tree passed to the OS. The "linux,stdout-path" property 288 in the chosen node is set to point to the correct serial node. 289 This option currently references CONFIG_CONS_INDEX, which is 290 incorrect when used with device tree as this option does not 291 exist / should not be used. 292 293config SYS_EXTRA_OPTIONS 294 string "Extra Options (DEPRECATED)" 295 help 296 The old configuration infrastructure (= mkconfig + boards.cfg) 297 provided the extra options field. If you have something like 298 "HAS_BAR,BAZ=64", the optional options 299 #define CONFIG_HAS 300 #define CONFIG_BAZ 64 301 will be defined in include/config.h. 302 This option was prepared for the smooth migration from the old 303 configuration to Kconfig. Since this option will be removed sometime, 304 new boards should not use this option. 305 306config SYS_TEXT_BASE 307 depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \ 308 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS 309 depends on !EFI_APP 310 hex "Text Base" 311 help 312 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture 313 314config SPL_LOAD_FIT 315 bool "Enable SPL loading U-Boot as a FIT" 316 depends on FIT 317 help 318 Normally with the SPL framework a legacy image is generated as part 319 of the build. This contains U-Boot along with information as to 320 where it should be loaded. This option instead enables generation 321 of a FIT (Flat Image Tree) which provides more flexibility. In 322 particular it can handle selecting from multiple device tree 323 and passing the correct one to U-Boot. 324 325config SPL_FIT_IMAGE_POST_PROCESS 326 bool "Enable post-processing of FIT artifacts after loading by the SPL" 327 depends on SPL_LOAD_FIT && TI_SECURE_DEVICE 328 help 329 Allows doing any sort of manipulation to blobs after they got extracted 330 from the U-Boot FIT image like stripping off headers or modifying the 331 size of the blob, verification, authentication, decryption etc. in a 332 platform or board specific way. In order to use this feature a platform 333 or board-specific implementation of board_fit_image_post_process() must 334 be provided. Also, anything done during this post-processing step would 335 need to be comprehended in how the images were prepared before being 336 injected into the FIT creation (i.e. the blobs would have been pre- 337 processed before being added to the FIT image). 338 339config SYS_CLK_FREQ 340 depends on ARC || ARCH_SUNXI 341 int "CPU clock frequency" 342 help 343 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 344 345endmenu # Boot images 346 347source "common/Kconfig" 348 349source "cmd/Kconfig" 350 351source "dts/Kconfig" 352 353source "net/Kconfig" 354 355source "drivers/Kconfig" 356 357source "fs/Kconfig" 358 359source "lib/Kconfig" 360 361source "test/Kconfig" 362