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 # 6 mainmenu "U-Boot $UBOOTVERSION Configuration" 7 8 config UBOOTVERSION 9 string 10 option env="UBOOTVERSION" 11 12 # Allow defaults in arch-specific code to override any given here 13 source "arch/Kconfig" 14 15 menu "General setup" 16 17 config BROKEN 18 bool 19 help 20 This option cannot be enabled. It is used as dependency 21 for broken and incomplete features. 22 23 config LOCALVERSION 24 string "Local version - append to U-Boot release" 25 help 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. 32 33 config LOCALVERSION_AUTO 34 bool "Automatically append version information to the version string" 35 default y 36 help 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 39 top of tree revision. 40 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. 45 46 (The actual string used here is the first eight characters produced 47 by running the command: 48 49 $ git rev-parse --verify HEAD 50 51 which is done within the script "scripts/setlocalversion".) 52 53 config CC_OPTIMIZE_FOR_SIZE 54 bool "Optimize for size" 55 default y 56 help 57 Enabling this option will pass "-Os" instead of "-O2" to gcc 58 resulting in a smaller U-Boot image. 59 60 This option is enabled by default for U-Boot. 61 62 config CC_COVERAGE 63 bool "Enable code coverage analysis" 64 depends on SANDBOX 65 help 66 Enabling this option will pass "--coverage" to gcc to compile 67 and link code instrumented for coverage analysis. 68 69 config DISTRO_DEFAULTS 70 bool "Select defaults suitable for booting general purpose Linux distributions" 71 imply USE_BOOTCOMMAND 72 select CMD_BOOTZ if ARM && !ARM64 73 select CMD_BOOTI if ARM64 74 select CMD_DHCP if CMD_NET 75 select CMD_PING if CMD_NET 76 select CMD_PXE if NET 77 select CMD_ENV_EXISTS 78 select CMD_EXT2 79 select CMD_EXT4 80 select CMD_FAT 81 select CMD_FS_GENERIC 82 imply CMD_MII if NET 83 select CMD_PART if PARTITIONS 84 select HUSH_PARSER 85 select CMDLINE_EDITING 86 select AUTO_COMPLETE 87 select SYS_LONGHELP 88 select SUPPORT_RAW_INITRD 89 select ENV_VARS_UBOOT_CONFIG 90 help 91 Select this to enable various options and commands which are suitable 92 for building u-boot for booting general purpose Linux distributions. 93 94 config ENV_VARS_UBOOT_CONFIG 95 bool "Add arch, board, vendor and soc variables to default environment" 96 help 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: 101 - CONFIG_SYS_ARCH 102 - CONFIG_SYS_CPU 103 - CONFIG_SYS_BOARD 104 - CONFIG_SYS_VENDOR 105 - CONFIG_SYS_SOC 106 107 config SYS_BOOT_GET_CMDLINE 108 bool "Enable kernel command line setup" 109 help 110 Enables allocating and saving kernel cmdline in space between 111 "bootm_low" and "bootm_low" + BOOTMAPSZ. 112 113 config SYS_BOOT_GET_KBD 114 bool "Enable kernel board information setup" 115 help 116 Enables allocating and saving a kernel copy of the bd_info in 117 space between "bootm_low" and "bootm_low" + BOOTMAPSZ. 118 119 config SYS_MALLOC_F 120 bool "Enable malloc() pool before relocation" 121 default y if DM 122 help 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. 127 128 config SYS_MALLOC_F_LEN 129 hex "Size of malloc() pool before relocation" 130 depends on SYS_MALLOC_F 131 default 0x1000 if AM33XX 132 default 0x400 133 help 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. 138 139 config SPL_SYS_MALLOC_F_LEN 140 hex "Size of malloc() pool in SPL before relocation" 141 depends on SYS_MALLOC_F 142 default SYS_MALLOC_F_LEN 143 help 144 Before relocation, memory is very limited on many platforms. Still, 145 we can provide a small malloc() pool if needed. Driver model in 146 particular needs this to operate, so that it can allocate the 147 initial serial device and any others that are needed. 148 149 config TPL_SYS_MALLOC_F_LEN 150 hex "Size of malloc() pool in TPL before relocation" 151 depends on SYS_MALLOC_F 152 default SYS_MALLOC_F_LEN 153 help 154 Before relocation, memory is very limited on many platforms. Still, 155 we can provide a small malloc() pool if needed. Driver model in 156 particular needs this to operate, so that it can allocate the 157 initial serial device and any others that are needed. 158 159 menuconfig EXPERT 160 bool "Configure standard U-Boot features (expert users)" 161 default y 162 help 163 This option allows certain base U-Boot options and settings 164 to be disabled or tweaked. This is for specialized 165 environments which can tolerate a "non-standard" U-Boot. 166 Use this only if you really know what you are doing. 167 168 if EXPERT 169 config SYS_MALLOC_CLEAR_ON_INIT 170 bool "Init with zeros the memory reserved for malloc (slow)" 171 default y 172 help 173 This setting is enabled by default. The reserved malloc 174 memory is initialized with zeros, so first malloc calls 175 will return the pointer to the zeroed memory. But this 176 slows the boot time. 177 178 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN 179 value, has more than few MiB, e.g. when uses bzip2 or bmp logo. 180 Then the boot time can be significantly reduced. 181 Warning: 182 When disabling this, please check if malloc calls, maybe 183 should be replaced by calloc - if one expects zeroed memory. 184 185 config TOOLS_DEBUG 186 bool "Enable debug information for tools" 187 help 188 Enable generation of debug information for tools such as mkimage. 189 This can be used for debugging purposes. With debug information 190 it is possible to set breakpoints on particular lines, single-step 191 debug through the source code, etc. 192 193 endif # EXPERT 194 195 config PHYS_64BIT 196 bool "64bit physical address support" 197 help 198 Say Y here to support 64bit physical memory address. 199 This can be used not only for 64bit SoCs, but also for 200 large physical address extention on 32bit SoCs. 201 202 config BUILD_ROM 203 bool "Build U-Boot as BIOS replacement" 204 depends on X86 205 help 206 This option allows to build a ROM version of U-Boot. 207 The build process generally requires several binary blobs 208 which are not shipped in the U-Boot source tree. 209 Please, see doc/README.x86 for details. 210 211 endmenu # General setup 212 213 menu "Boot images" 214 215 config ANDROID_BOOT_IMAGE 216 bool "Enable support for Android Boot Images" 217 default y if FASTBOOT 218 help 219 This enables support for booting images which use the Android 220 image format header. 221 222 config FIT 223 bool "Support Flattened Image Tree" 224 select MD5 225 select SHA1 226 help 227 This option allows you to boot the new uImage structure, 228 Flattened Image Tree. FIT is formally a FDT, which can include 229 images of various types (kernel, FDT blob, ramdisk, etc.) 230 in a single blob. To boot this new uImage structure, 231 pass the address of the blob to the "bootm" command. 232 FIT is very flexible, supporting compression, multiple images, 233 multiple configurations, verification through hashing and also 234 verified boot (secure boot using RSA). 235 236 if FIT 237 238 config FIT_ENABLE_SHA256_SUPPORT 239 bool "Support SHA256 checksum of FIT image contents" 240 select SHA256 241 default y 242 help 243 Enable this to support SHA256 checksum of FIT image contents. A 244 SHA256 checksum is a 256-bit (32-byte) hash value used to check that 245 the image contents have not been corrupted. SHA256 is recommended 246 for use in secure applications since (as at 2016) there is no known 247 feasible attack that could produce a 'collision' with differing 248 input data. Use this for the highest security. Note that only the 249 SHA256 variant is supported: SHA512 and others are not currently 250 supported in U-Boot. 251 252 config FIT_SIGNATURE 253 bool "Enable signature verification of FIT uImages" 254 depends on DM 255 select RSA 256 select HASH 257 help 258 This option enables signature verification of FIT uImages, 259 using a hash signed and verified using RSA. If 260 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive 261 hashing is available using hardware, then the RSA library will use 262 it. See doc/uImage.FIT/signature.txt for more details. 263 264 WARNING: When relying on signed FIT images with a required signature 265 check the legacy image format is disabled by default, so that 266 unsigned images cannot be loaded. If a board needs the legacy image 267 format support in this case, enable it using 268 CONFIG_IMAGE_FORMAT_LEGACY. 269 270 config FIT_VERBOSE 271 bool "Show verbose messages when FIT images fail" 272 help 273 Generally a system will have valid FIT images so debug messages 274 are a waste of code space. If you are debugging your images then 275 you can enable this option to get more verbose information about 276 failures. 277 278 config FIT_BEST_MATCH 279 bool "Select the best match for the kernel device tree" 280 help 281 When no configuration is explicitly selected, default to the 282 one whose fdt's compatibility field best matches that of 283 U-Boot itself. A match is considered "best" if it matches the 284 most specific compatibility entry of U-Boot's fdt's root node. 285 The order of entries in the configuration's fdt is ignored. 286 287 config FIT_IMAGE_POST_PROCESS 288 bool "Enable post-processing of FIT artifacts after loading by U-Boot" 289 depends on TI_SECURE_DEVICE 290 help 291 Allows doing any sort of manipulation to blobs after they got extracted 292 from FIT images like stripping off headers or modifying the size of the 293 blob, verification, authentication, decryption etc. in a platform or 294 board specific way. In order to use this feature a platform or board- 295 specific implementation of board_fit_image_post_process() must be 296 provided. Also, anything done during this post-processing step would 297 need to be comprehended in how the images were prepared before being 298 injected into the FIT creation (i.e. the blobs would have been pre- 299 processed before being added to the FIT image). 300 301 if SPL 302 303 config SPL_FIT 304 bool "Support Flattened Image Tree within SPL" 305 depends on SPL 306 select SPL_OF_LIBFDT 307 308 config SPL_FIT_PRINT 309 bool "Support FIT printing within SPL" 310 depends on SPL_FIT 311 help 312 Support printing the content of the fitImage in a verbose manner in SPL. 313 314 config SPL_FIT_SIGNATURE 315 bool "Enable signature verification of FIT firmware within SPL" 316 depends on SPL_DM 317 select SPL_FIT 318 select SPL_RSA 319 320 config SPL_LOAD_FIT 321 bool "Enable SPL loading U-Boot as a FIT" 322 select SPL_FIT 323 help 324 Normally with the SPL framework a legacy image is generated as part 325 of the build. This contains U-Boot along with information as to 326 where it should be loaded. This option instead enables generation 327 of a FIT (Flat Image Tree) which provides more flexibility. In 328 particular it can handle selecting from multiple device tree 329 and passing the correct one to U-Boot. 330 331 config SPL_LOAD_FIT_FULL 332 bool "Enable SPL loading U-Boot as a FIT" 333 select SPL_FIT 334 help 335 Normally with the SPL framework a legacy image is generated as part 336 of the build. This contains U-Boot along with information as to 337 where it should be loaded. This option instead enables generation 338 of a FIT (Flat Image Tree) which provides more flexibility. In 339 particular it can handle selecting from multiple device tree 340 and passing the correct one to U-Boot. 341 342 config SPL_FIT_IMAGE_POST_PROCESS 343 bool "Enable post-processing of FIT artifacts after loading by the SPL" 344 depends on SPL_LOAD_FIT 345 help 346 Allows doing any sort of manipulation to blobs after they got extracted 347 from the U-Boot FIT image like stripping off headers or modifying the 348 size of the blob, verification, authentication, decryption etc. in a 349 platform or board specific way. In order to use this feature a platform 350 or board-specific implementation of board_fit_image_post_process() must 351 be provided. Also, anything done during this post-processing step would 352 need to be comprehended in how the images were prepared before being 353 injected into the FIT creation (i.e. the blobs would have been pre- 354 processed before being added to the FIT image). 355 356 config SPL_FIT_SOURCE 357 string ".its source file for U-Boot FIT image" 358 depends on SPL_FIT 359 help 360 Specifies a (platform specific) FIT source file to generate the 361 U-Boot FIT image. This could specify further image to load and/or 362 execute. 363 364 config SPL_FIT_GENERATOR 365 string ".its file generator script for U-Boot FIT image" 366 depends on SPL_FIT 367 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI 368 help 369 Specifies a (platform specific) script file to generate the FIT 370 source file used to build the U-Boot FIT image file. This gets 371 passed a list of supported device tree file stub names to 372 include in the generated image. 373 374 endif # SPL 375 376 endif # FIT 377 378 config IMAGE_FORMAT_LEGACY 379 bool "Enable support for the legacy image format" 380 default y if !FIT_SIGNATURE 381 help 382 This option enables the legacy image format. It is enabled by 383 default for backward compatibility, unless FIT_SIGNATURE is 384 set where it is disabled so that unsigned images cannot be 385 loaded. If a board needs the legacy image format support in this 386 case, enable it here. 387 388 config OF_BOARD_SETUP 389 bool "Set up board-specific details in device tree before boot" 390 depends on OF_LIBFDT 391 help 392 This causes U-Boot to call ft_board_setup() before booting into 393 the Operating System. This function can set up various 394 board-specific information in the device tree for use by the OS. 395 The device tree is then passed to the OS. 396 397 config OF_SYSTEM_SETUP 398 bool "Set up system-specific details in device tree before boot" 399 depends on OF_LIBFDT 400 help 401 This causes U-Boot to call ft_system_setup() before booting into 402 the Operating System. This function can set up various 403 system-specific information in the device tree for use by the OS. 404 The device tree is then passed to the OS. 405 406 config OF_STDOUT_VIA_ALIAS 407 bool "Update the device-tree stdout alias from U-Boot" 408 depends on OF_LIBFDT 409 help 410 This uses U-Boot's serial alias from the aliases node to update 411 the device tree passed to the OS. The "linux,stdout-path" property 412 in the chosen node is set to point to the correct serial node. 413 This option currently references CONFIG_CONS_INDEX, which is 414 incorrect when used with device tree as this option does not 415 exist / should not be used. 416 417 config SYS_EXTRA_OPTIONS 418 string "Extra Options (DEPRECATED)" 419 help 420 The old configuration infrastructure (= mkconfig + boards.cfg) 421 provided the extra options field. If you have something like 422 "HAS_BAR,BAZ=64", the optional options 423 #define CONFIG_HAS 424 #define CONFIG_BAZ 64 425 will be defined in include/config.h. 426 This option was prepared for the smooth migration from the old 427 configuration to Kconfig. Since this option will be removed sometime, 428 new boards should not use this option. 429 430 config SYS_TEXT_BASE 431 depends on !NIOS2 && !XTENSA 432 depends on !EFI_APP 433 default 0x80800000 if ARCH_OMAP2PLUS 434 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S 435 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I 436 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S 437 hex "Text Base" 438 help 439 The address in memory that U-Boot will be running from, initially. 440 441 442 443 config SYS_CLK_FREQ 444 depends on ARC || ARCH_SUNXI 445 int "CPU clock frequency" 446 help 447 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 448 449 config ARCH_FIXUP_FDT_MEMORY 450 bool "Enable arch_fixup_memory_banks() call" 451 default y 452 help 453 Enable FDT memory map syncup before OS boot. This feature can be 454 used for booting OS with different memory setup where the part of 455 the memory location should be used for different purpose. 456 457 endmenu # Boot images 458 459 source "api/Kconfig" 460 461 source "common/Kconfig" 462 463 source "cmd/Kconfig" 464 465 source "disk/Kconfig" 466 467 source "dts/Kconfig" 468 469 source "env/Kconfig" 470 471 source "net/Kconfig" 472 473 source "drivers/Kconfig" 474 475 source "fs/Kconfig" 476 477 source "lib/Kconfig" 478 479 source "test/Kconfig" 480
