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 BROKEN 18 bool 19 help 20 This option cannot be enabled. It is used as dependency 21 for broken and incomplete features. 22 23config 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 33config 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 53config 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 62config DISTRO_DEFAULTS 63 bool "Select defaults suitable for booting general purpose Linux distributions" 64 default y if ARCH_SUNXI || TEGRA 65 default y if ARCH_LS2080A 66 default y if ARCH_MESON 67 default y if ARCH_ROCKCHIP 68 default n 69 select CMD_BOOTZ if ARM && !ARM64 70 select CMD_BOOTI if ARM64 71 select CMD_DHCP 72 imply CMD_PXE 73 select CMD_EXT2 74 select CMD_EXT4 75 select CMD_FAT 76 select CMD_FS_GENERIC 77 imply CMD_MII 78 select CMD_PING 79 select CMD_PART 80 select HUSH_PARSER 81 help 82 Select this to enable various options and commands which are suitable 83 for building u-boot for booting general purpose Linux distributions. 84 85config SYS_MALLOC_F 86 bool "Enable malloc() pool before relocation" 87 default y if DM 88 help 89 Before relocation, memory is very limited on many platforms. Still, 90 we can provide a small malloc() pool if needed. Driver model in 91 particular needs this to operate, so that it can allocate the 92 initial serial device and any others that are needed. 93 94config SYS_MALLOC_F_LEN 95 hex "Size of malloc() pool before relocation" 96 depends on SYS_MALLOC_F 97 default 0x400 98 help 99 Before relocation, memory is very limited on many platforms. Still, 100 we can provide a small malloc() pool if needed. Driver model in 101 particular needs this to operate, so that it can allocate the 102 initial serial device and any others that are needed. 103 104config SPL_SYS_MALLOC_F_LEN 105 hex "Size of malloc() pool in SPL before relocation" 106 depends on SYS_MALLOC_F 107 default SYS_MALLOC_F_LEN 108 help 109 Before relocation, memory is very limited on many platforms. Still, 110 we can provide a small malloc() pool if needed. Driver model in 111 particular needs this to operate, so that it can allocate the 112 initial serial device and any others that are needed. 113 114config TPL_SYS_MALLOC_F_LEN 115 hex "Size of malloc() pool in TPL before relocation" 116 depends on SYS_MALLOC_F 117 default SYS_MALLOC_F_LEN 118 help 119 Before relocation, memory is very limited on many platforms. Still, 120 we can provide a small malloc() pool if needed. Driver model in 121 particular needs this to operate, so that it can allocate the 122 initial serial device and any others that are needed. 123 124menuconfig EXPERT 125 bool "Configure standard U-Boot features (expert users)" 126 default y 127 help 128 This option allows certain base U-Boot options and settings 129 to be disabled or tweaked. This is for specialized 130 environments which can tolerate a "non-standard" U-Boot. 131 Use this only if you really know what you are doing. 132 133if EXPERT 134 config SYS_MALLOC_CLEAR_ON_INIT 135 bool "Init with zeros the memory reserved for malloc (slow)" 136 default y if !ARCH_ROCKCHIP 137 help 138 This setting is enabled by default. The reserved malloc 139 memory is initialized with zeros, so first malloc calls 140 will return the pointer to the zeroed memory. But this 141 slows the boot time. 142 143 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN 144 value, has more than few MiB, e.g. when uses bzip2 or bmp logo. 145 Then the boot time can be significantly reduced. 146 Warning: 147 When disabling this, please check if malloc calls, maybe 148 should be replaced by calloc - if one expects zeroed memory. 149 150config TOOLS_DEBUG 151 bool "Enable debug information for tools" 152 help 153 Enable generation of debug information for tools such as mkimage. 154 This can be used for debugging purposes. With debug information 155 it is possible to set breakpoints on particular lines, single-step 156 debug through the source code, etc. 157 158endif # EXPERT 159 160config PHYS_64BIT 161 bool "64bit physical address support" 162 help 163 Say Y here to support 64bit physical memory address. 164 This can be used not only for 64bit SoCs, but also for 165 large physical address extention on 32bit SoCs. 166 167endmenu # General setup 168 169menu "Boot images" 170 171config IMAGE_GZIP 172 bool "U-Boot Image with gzip compression" 173 default n 174 help 175 This enables gzip compression on U-Boot Image. 176 177config ANDROID_BOOT_IMAGE 178 bool "Enable support for Android Boot Images" 179 default y if FASTBOOT 180 help 181 This enables support for booting images which use the Android 182 image format header. 183 184config FIT 185 bool "Support Flattened Image Tree" 186 help 187 This option allows you to boot the new uImage structure, 188 Flattened Image Tree. FIT is formally a FDT, which can include 189 images of various types (kernel, FDT blob, ramdisk, etc.) 190 in a single blob. To boot this new uImage structure, 191 pass the address of the blob to the "bootm" command. 192 FIT is very flexible, supporting compression, multiple images, 193 multiple configurations, verification through hashing and also 194 verified boot (secure boot using RSA). 195 196if FIT 197 198config FIT_ENABLE_SHA256_SUPPORT 199 bool "Support SHA256 checksum of FIT image contents" 200 select SHA256 if !DM_CRYPTO 201 default y 202 help 203 Enable this to support SHA256 checksum of FIT image contents. A 204 SHA256 checksum is a 256-bit (32-byte) hash value used to check that 205 the image contents have not been corrupted. SHA256 is recommended 206 for use in secure applications since (as at 2016) there is no known 207 feasible attack that could produce a 'collision' with differing 208 input data. Use this for the highest security. Note that only the 209 SHA256 variant is supported: SHA512 and others are not currently 210 supported in U-Boot. 211 212config FIT_ENABLE_RSA4096_SUPPORT 213 bool "Support RSA4096 verification of FIT image contents" 214 select RSA_SOFTWARE_EXP if !DM_CRYPTO 215 default n 216 help 217 Enable this to support RSA4096 checksum of FIT image contents. A 218 RSA4096 is a 4096-bit (512-byte) key used to check that 219 check if the content comes from an encryption party. RSA4096 is one 220 of algorithms recommended for use in secure applications since (as at 2016) 221 there is no known feasible attack that could produce a 'collision' with differing 222 input data. Use this for the higher security than RSA2048 in default. 223 224config FIT_SIGNATURE 225 bool "Enable signature verification of FIT uImages" 226 depends on DM 227 select RSA 228 select CONSOLE_DISABLE_CLI 229 help 230 This option enables signature verification of FIT uImages, 231 using a hash signed and verified using RSA. If 232 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive 233 hashing is available using hardware, then the RSA library will use 234 it. See doc/uImage.FIT/signature.txt for more details. 235 236 WARNING: When relying on signed FIT images with a required signature 237 check the legacy image format is disabled by default, so that 238 unsigned images cannot be loaded. If a board needs the legacy image 239 format support in this case, enable it using 240 CONFIG_IMAGE_FORMAT_LEGACY. 241 242config FIT_ROLLBACK_PROTECT 243 bool "Enable rollback-index protection for FIT image" 244 depends on FIT_SIGNATURE 245 help 246 Enable rollback-index protection for FIT image 247 248config FIT_ENABLE_RSASSA_PSS_SUPPORT 249 bool "Support rsassa-pss signature scheme of FIT image contents" 250 depends on FIT_SIGNATURE 251 default y 252 help 253 Enable this to support the pss padding algorithm as described 254 in the rfc8017 (https://tools.ietf.org/html/rfc8017). 255 256config FIT_CIPHER 257 bool "Enable ciphering data in a FIT uImages" 258 depends on DM && OPTEE_CLIENT 259 help 260 Enable the feature of data ciphering/unciphering in the tool mkimage 261 and in the u-boot support of the FIT image. 262 263config FIT_VERBOSE 264 bool "Show verbose messages when FIT images fail" 265 help 266 Generally a system will have valid FIT images so debug messages 267 are a waste of code space. If you are debugging your images then 268 you can enable this option to get more verbose information about 269 failures. 270 271config FIT_BEST_MATCH 272 bool "Select the best match for the kernel device tree" 273 help 274 When no configuration is explicitly selected, default to the 275 one whose fdt's compatibility field best matches that of 276 U-Boot itself. A match is considered "best" if it matches the 277 most specific compatibility entry of U-Boot's fdt's root node. 278 The order of entries in the configuration's fdt is ignored. 279 280config FIT_IMAGE_POST_PROCESS 281 bool "Enable post-processing of FIT artifacts after loading by U-Boot" 282 help 283 Allows doing any sort of manipulation to blobs after they got extracted 284 from FIT images like stripping off headers or modifying the size of the 285 blob, verification, authentication, decryption etc. in a platform or 286 board specific way. In order to use this feature a platform or board- 287 specific implementation of board_fit_image_post_process() must be 288 provided. Also, anything done during this post-processing step would 289 need to be comprehended in how the images were prepared before being 290 injected into the FIT creation (i.e. the blobs would have been pre- 291 processed before being added to the FIT image). 292 293config FIT_HW_CRYPTO 294 bool "Enable hardware crypto for FIT image checksum and rsa verify" 295 depends on DM_CRYPTO 296 help 297 Enable hardware crypto for FIT image checksum and rsa verify. 298 299config FIT_PRINT 300 bool "Enable fit image structure and data print" 301 default y 302 help 303 Say y here if you want to enable fit image structure and data 304 print. 305 306config FIT_OMIT_UBOOT 307 bool "Omit u-boot-nodtb.bin and u-boot.dtb when output uboot.itb" 308 309if SPL 310 311config SPL_FIT 312 bool "Support Flattened Image Tree within SPL" 313 depends on SPL 314 select SPL_OF_LIBFDT 315 316config SPL_FIT_SIGNATURE 317 bool "Enable signature verification of FIT firmware within SPL" 318 depends on SPL_DM 319 select SPL_FIT 320 select SPL_RSA 321 322config SPL_FIT_ROLLBACK_PROTECT 323 bool "Enable SPL rollback-index protection for FIT image" 324 depends on SPL_FIT_SIGNATURE 325 help 326 Enable SPL rollback-index protection for FIT image 327 328config SPL_FIT_CIPHER 329 bool "Enable ciphering data in a FIT uImages in SPL" 330 depends on SPL_DM 331 help 332 Enable the feature of data ciphering/unciphering in the tool mkimage 333 and in the u-boot support of the FIT image in SPL. 334 335config SPL_LOAD_FIT 336 bool "Enable SPL loading U-Boot as a FIT" 337 select SPL_FIT 338 help 339 Normally with the SPL framework a legacy image is generated as part 340 of the build. This contains U-Boot along with information as to 341 where it should be loaded. This option instead enables generation 342 of a FIT (Flat Image Tree) which provides more flexibility. In 343 particular it can handle selecting from multiple device tree 344 and passing the correct one to U-Boot. 345 346config SPL_FIT_IMAGE_POST_PROCESS 347 bool "Enable post-processing of FIT artifacts after loading by the SPL" 348 depends on SPL_LOAD_FIT 349 help 350 Allows doing any sort of manipulation to blobs after they got extracted 351 from the U-Boot FIT image like stripping off headers or modifying the 352 size of the blob, verification, authentication, decryption etc. in a 353 platform or board specific way. In order to use this feature a platform 354 or board-specific implementation of board_fit_image_post_process() must 355 be provided. Also, anything done during this post-processing step would 356 need to be comprehended in how the images were prepared before being 357 injected into the FIT creation (i.e. the blobs would have been pre- 358 processed before being added to the FIT image). 359 360config SPL_FIT_HW_CRYPTO 361 bool "Enable SPL hardware crypto for FIT image checksum and rsa verify" 362 depends on SPL_DM_CRYPTO 363 help 364 Enable SPL hardware crypto for FIT image checksum and rsa verify. 365 366config SPL_SYS_DCACHE_OFF 367 bool "Disable SPL dcache" 368 default y 369 help 370 Disable SPL dcache. Please make sure CONFIG_SPL_SYS_MALLOC_F_LEN 371 is large enough to malloc TLB and bd_t buffer while enabling dcache. 372 373config SPL_FIT_PRINT 374 bool "Enable fit image structure and data print in SPL" 375 default n 376 help 377 Say y here if you want to enable fit image structure and data 378 print in SPL. 379 380endif # SPL 381 382config SPL_FIT_SOURCE 383 string ".its source file for U-Boot FIT image" 384 depends on SPL_FIT || FIT 385 help 386 Specifies a (platform specific) FIT source file to generate the 387 U-Boot FIT image. This could specify further image to load and/or 388 execute. 389 390config SPL_FIT_GENERATOR 391 string ".its file generator script for U-Boot FIT image" 392 depends on SPL_FIT || FIT 393 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI 394 help 395 Specifies a (platform specific) script file to generate the FIT 396 source file used to build the U-Boot FIT image file. This gets 397 passed a list of supported device tree file stub names to 398 include in the generated image. 399 400config SPL_FIT_IMAGE_KB 401 int "SPL FIT image size in KiB" 402 depends on SPL_FIT || FIT 403 default 2048 404 help 405 SPL FIT image size in KiB, default 2048KB = 1024KB(u-boot) + 1024KB(tee/atf + others). 406 407config SPL_FIT_IMAGE_MULTIPLE 408 int "SPL FIT image multiple number" 409 depends on SPL_FIT || FIT 410 default 2 411 help 412 SPL FIT image multiple number. 413 414endif # FIT 415 416config OF_BOARD_SETUP 417 bool "Set up board-specific details in device tree before boot" 418 depends on OF_LIBFDT 419 help 420 This causes U-Boot to call ft_board_setup() before booting into 421 the Operating System. This function can set up various 422 board-specific information in the device tree for use by the OS. 423 The device tree is then passed to the OS. 424 425config OF_SYSTEM_SETUP 426 bool "Set up system-specific details in device tree before boot" 427 depends on OF_LIBFDT 428 help 429 This causes U-Boot to call ft_system_setup() before booting into 430 the Operating System. This function can set up various 431 system-specific information in the device tree for use by the OS. 432 The device tree is then passed to the OS. 433 434config OF_STDOUT_VIA_ALIAS 435 bool "Update the device-tree stdout alias from U-Boot" 436 depends on OF_LIBFDT 437 help 438 This uses U-Boot's serial alias from the aliases node to update 439 the device tree passed to the OS. The "linux,stdout-path" property 440 in the chosen node is set to point to the correct serial node. 441 This option currently references CONFIG_CONS_INDEX, which is 442 incorrect when used with device tree as this option does not 443 exist / should not be used. 444 445config SYS_EXTRA_OPTIONS 446 string "Extra Options (DEPRECATED)" 447 help 448 The old configuration infrastructure (= mkconfig + boards.cfg) 449 provided the extra options field. If you have something like 450 "HAS_BAR,BAZ=64", the optional options 451 #define CONFIG_HAS 452 #define CONFIG_BAZ 64 453 will be defined in include/config.h. 454 This option was prepared for the smooth migration from the old 455 configuration to Kconfig. Since this option will be removed sometime, 456 new boards should not use this option. 457 458config SYS_TEXT_BASE 459 depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \ 460 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \ 461 ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS 462 depends on !EFI_APP 463 hex "Text Base" 464 help 465 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture 466 467 default 0x80800000 if ARCH_OMAP2PLUS 468 469 470config SYS_CLK_FREQ 471 depends on ARC || ARCH_SUNXI 472 int "CPU clock frequency" 473 help 474 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 475 476config ARCH_FIXUP_FDT_MEMORY 477 bool "Enable arch_fixup_memory_banks() call" 478 default y 479 help 480 Enable FDT memory map syncup before OS boot. This feature can be 481 used for booting OS with different memory setup where the part of 482 the memory location should be used for different purpose. 483 484endmenu # Boot images 485 486source "api/Kconfig" 487 488source "common/Kconfig" 489 490source "cmd/Kconfig" 491 492source "disk/Kconfig" 493 494source "dts/Kconfig" 495 496source "env/Kconfig" 497 498source "net/Kconfig" 499 500source "drivers/Kconfig" 501 502source "fs/Kconfig" 503 504source "lib/Kconfig" 505 506source "test/Kconfig" 507