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 ANDROID_BOOT_IMAGE 172 bool "Enable support for Android Boot Images" 173 default y if FASTBOOT 174 help 175 This enables support for booting images which use the Android 176 image format header. 177 178config FIT 179 bool "Support Flattened Image Tree" 180 help 181 This option allows you to boot the new uImage structure, 182 Flattened Image Tree. FIT is formally a FDT, which can include 183 images of various types (kernel, FDT blob, ramdisk, etc.) 184 in a single blob. To boot this new uImage structure, 185 pass the address of the blob to the "bootm" command. 186 FIT is very flexible, supporting compression, multiple images, 187 multiple configurations, verification through hashing and also 188 verified boot (secure boot using RSA). 189 190if FIT 191 192config FIT_ENABLE_SHA256_SUPPORT 193 bool "Support SHA256 checksum of FIT image contents" 194 select SHA256 if !DM_CRYPTO 195 default y 196 help 197 Enable this to support SHA256 checksum of FIT image contents. A 198 SHA256 checksum is a 256-bit (32-byte) hash value used to check that 199 the image contents have not been corrupted. SHA256 is recommended 200 for use in secure applications since (as at 2016) there is no known 201 feasible attack that could produce a 'collision' with differing 202 input data. Use this for the highest security. Note that only the 203 SHA256 variant is supported: SHA512 and others are not currently 204 supported in U-Boot. 205 206config FIT_ENABLE_RSA4096_SUPPORT 207 bool "Support RSA4096 verification of FIT image contents" 208 select RSA_SOFTWARE_EXP if !DM_CRYPTO 209 default n 210 help 211 Enable this to support RSA4096 checksum of FIT image contents. A 212 RSA4096 is a 4096-bit (512-byte) key used to check that 213 check if the content comes from an encryption party. RSA4096 is one 214 of algorithms recommended for use in secure applications since (as at 2016) 215 there is no known feasible attack that could produce a 'collision' with differing 216 input data. Use this for the higher security than RSA2048 in default. 217 218config FIT_SIGNATURE 219 bool "Enable signature verification of FIT uImages" 220 depends on DM 221 select RSA 222 select CONSOLE_DISABLE_CLI 223 help 224 This option enables signature verification of FIT uImages, 225 using a hash signed and verified using RSA. If 226 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive 227 hashing is available using hardware, then the RSA library will use 228 it. See doc/uImage.FIT/signature.txt for more details. 229 230 WARNING: When relying on signed FIT images with a required signature 231 check the legacy image format is disabled by default, so that 232 unsigned images cannot be loaded. If a board needs the legacy image 233 format support in this case, enable it using 234 CONFIG_IMAGE_FORMAT_LEGACY. 235 236config FIT_ROLLBACK_PROTECT 237 bool "Enable rollback-index protection for FIT image" 238 depends on FIT_SIGNATURE 239 help 240 Enable rollback-index protection for FIT image 241 242config FIT_ENABLE_RSASSA_PSS_SUPPORT 243 bool "Support rsassa-pss signature scheme of FIT image contents" 244 depends on FIT_SIGNATURE 245 default y 246 help 247 Enable this to support the pss padding algorithm as described 248 in the rfc8017 (https://tools.ietf.org/html/rfc8017). 249 250config FIT_VERBOSE 251 bool "Show verbose messages when FIT images fail" 252 help 253 Generally a system will have valid FIT images so debug messages 254 are a waste of code space. If you are debugging your images then 255 you can enable this option to get more verbose information about 256 failures. 257 258config FIT_BEST_MATCH 259 bool "Select the best match for the kernel device tree" 260 help 261 When no configuration is explicitly selected, default to the 262 one whose fdt's compatibility field best matches that of 263 U-Boot itself. A match is considered "best" if it matches the 264 most specific compatibility entry of U-Boot's fdt's root node. 265 The order of entries in the configuration's fdt is ignored. 266 267config FIT_IMAGE_POST_PROCESS 268 bool "Enable post-processing of FIT artifacts after loading by U-Boot" 269 help 270 Allows doing any sort of manipulation to blobs after they got extracted 271 from FIT images like stripping off headers or modifying the size of the 272 blob, verification, authentication, decryption etc. in a platform or 273 board specific way. In order to use this feature a platform or board- 274 specific implementation of board_fit_image_post_process() must be 275 provided. Also, anything done during this post-processing step would 276 need to be comprehended in how the images were prepared before being 277 injected into the FIT creation (i.e. the blobs would have been pre- 278 processed before being added to the FIT image). 279 280config FIT_HW_CRYPTO 281 bool "Enable hardware crypto for FIT image checksum and rsa verify" 282 depends on DM_CRYPTO 283 help 284 Enable hardware crypto for FIT image checksum and rsa verify. 285 286config FIT_PRINT 287 bool "Enable fit image structure and data print" 288 default y 289 help 290 Say y here if you want to enable fit image structure and data 291 print. 292 293config FIT_OMIT_UBOOT 294 bool "Omit u-boot-nodtb.bin and u-boot.dtb when output uboot.itb" 295 296if SPL 297 298config SPL_FIT 299 bool "Support Flattened Image Tree within SPL" 300 depends on SPL 301 select SPL_OF_LIBFDT 302 303config SPL_FIT_SIGNATURE 304 bool "Enable signature verification of FIT firmware within SPL" 305 depends on SPL_DM 306 select SPL_FIT 307 select SPL_RSA 308 309config SPL_FIT_ROLLBACK_PROTECT 310 bool "Enable SPL rollback-index protection for FIT image" 311 depends on SPL_FIT_SIGNATURE 312 help 313 Enable SPL rollback-index protection for FIT image 314 315config SPL_LOAD_FIT 316 bool "Enable SPL loading U-Boot as a FIT" 317 select SPL_FIT 318 help 319 Normally with the SPL framework a legacy image is generated as part 320 of the build. This contains U-Boot along with information as to 321 where it should be loaded. This option instead enables generation 322 of a FIT (Flat Image Tree) which provides more flexibility. In 323 particular it can handle selecting from multiple device tree 324 and passing the correct one to U-Boot. 325 326config SPL_FIT_IMAGE_POST_PROCESS 327 bool "Enable post-processing of FIT artifacts after loading by the SPL" 328 depends on SPL_LOAD_FIT 329 help 330 Allows doing any sort of manipulation to blobs after they got extracted 331 from the U-Boot FIT image like stripping off headers or modifying the 332 size of the blob, verification, authentication, decryption etc. in a 333 platform or board specific way. In order to use this feature a platform 334 or board-specific implementation of board_fit_image_post_process() must 335 be provided. Also, anything done during this post-processing step would 336 need to be comprehended in how the images were prepared before being 337 injected into the FIT creation (i.e. the blobs would have been pre- 338 processed before being added to the FIT image). 339 340config SPL_FIT_HW_CRYPTO 341 bool "Enable SPL hardware crypto for FIT image checksum and rsa verify" 342 depends on SPL_DM_CRYPTO 343 help 344 Enable SPL hardware crypto for FIT image checksum and rsa verify. 345 346config SPL_SYS_DCACHE_OFF 347 bool "Disable SPL dcache" 348 default y 349 help 350 Disable SPL dcache. Please make sure CONFIG_SPL_SYS_MALLOC_F_LEN 351 is large enough to malloc TLB and bd_t buffer while enabling dcache. 352 353config SPL_FIT_PRINT 354 bool "Enable fit image structure and data print in SPL" 355 default n 356 help 357 Say y here if you want to enable fit image structure and data 358 print in SPL. 359 360endif # SPL 361 362config SPL_FIT_SOURCE 363 string ".its source file for U-Boot FIT image" 364 depends on SPL_FIT || FIT 365 help 366 Specifies a (platform specific) FIT source file to generate the 367 U-Boot FIT image. This could specify further image to load and/or 368 execute. 369 370config SPL_FIT_GENERATOR 371 string ".its file generator script for U-Boot FIT image" 372 depends on SPL_FIT || FIT 373 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI 374 help 375 Specifies a (platform specific) script file to generate the FIT 376 source file used to build the U-Boot FIT image file. This gets 377 passed a list of supported device tree file stub names to 378 include in the generated image. 379 380config SPL_FIT_IMAGE_KB 381 int "SPL FIT image size in KiB" 382 depends on SPL_FIT || FIT 383 default 2048 384 help 385 SPL FIT image size in KiB, default 2048KB = 1024KB(u-boot) + 1024KB(tee/atf + others). 386 387config SPL_FIT_IMAGE_MULTIPLE 388 int "SPL FIT image multiple number" 389 depends on SPL_FIT || FIT 390 default 2 391 help 392 SPL FIT image multiple number. 393 394endif # FIT 395 396config OF_BOARD_SETUP 397 bool "Set up board-specific details in device tree before boot" 398 depends on OF_LIBFDT 399 help 400 This causes U-Boot to call ft_board_setup() before booting into 401 the Operating System. This function can set up various 402 board-specific information in the device tree for use by the OS. 403 The device tree is then passed to the OS. 404 405config OF_SYSTEM_SETUP 406 bool "Set up system-specific details in device tree before boot" 407 depends on OF_LIBFDT 408 help 409 This causes U-Boot to call ft_system_setup() before booting into 410 the Operating System. This function can set up various 411 system-specific information in the device tree for use by the OS. 412 The device tree is then passed to the OS. 413 414config OF_STDOUT_VIA_ALIAS 415 bool "Update the device-tree stdout alias from U-Boot" 416 depends on OF_LIBFDT 417 help 418 This uses U-Boot's serial alias from the aliases node to update 419 the device tree passed to the OS. The "linux,stdout-path" property 420 in the chosen node is set to point to the correct serial node. 421 This option currently references CONFIG_CONS_INDEX, which is 422 incorrect when used with device tree as this option does not 423 exist / should not be used. 424 425config SYS_EXTRA_OPTIONS 426 string "Extra Options (DEPRECATED)" 427 help 428 The old configuration infrastructure (= mkconfig + boards.cfg) 429 provided the extra options field. If you have something like 430 "HAS_BAR,BAZ=64", the optional options 431 #define CONFIG_HAS 432 #define CONFIG_BAZ 64 433 will be defined in include/config.h. 434 This option was prepared for the smooth migration from the old 435 configuration to Kconfig. Since this option will be removed sometime, 436 new boards should not use this option. 437 438config SYS_TEXT_BASE 439 depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \ 440 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \ 441 ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS 442 depends on !EFI_APP 443 hex "Text Base" 444 help 445 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture 446 447 default 0x80800000 if ARCH_OMAP2PLUS 448 449 450config SYS_CLK_FREQ 451 depends on ARC || ARCH_SUNXI 452 int "CPU clock frequency" 453 help 454 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 455 456config ARCH_FIXUP_FDT_MEMORY 457 bool "Enable arch_fixup_memory_banks() call" 458 default y 459 help 460 Enable FDT memory map syncup before OS boot. This feature can be 461 used for booting OS with different memory setup where the part of 462 the memory location should be used for different purpose. 463 464endmenu # Boot images 465 466source "api/Kconfig" 467 468source "common/Kconfig" 469 470source "cmd/Kconfig" 471 472source "disk/Kconfig" 473 474source "dts/Kconfig" 475 476source "env/Kconfig" 477 478source "net/Kconfig" 479 480source "drivers/Kconfig" 481 482source "fs/Kconfig" 483 484source "lib/Kconfig" 485 486source "test/Kconfig" 487