1menu "Boot timing" 2 3config BOOTSTAGE 4 bool "Boot timing and reporting" 5 help 6 Enable recording of boot time while booting. To use it, insert 7 calls to bootstage_mark() with a suitable BOOTSTAGE_ID from 8 bootstage.h. Only a single entry is recorded for each ID. You can 9 give the entry a name with bootstage_mark_name(). You can also 10 record elapsed time in a particular stage using bootstage_start() 11 before starting and bootstage_accum() when finished. Bootstage will 12 add up all the accumulated time and report it. 13 14 Normally, IDs are defined in bootstage.h but a small number of 15 additional 'user' IDs can be used by passing BOOTSTAGE_ID_ALLOC 16 as the ID. 17 18 Calls to show_boot_progress() will also result in log entries but 19 these will not have names. 20 21config SPL_BOOTSTAGE 22 bool "Boot timing and reported in SPL" 23 depends on BOOTSTAGE 24 help 25 Enable recording of boot time in SPL. To make this visible to U-Boot 26 proper, enable BOOTSTAGE_STASH as well. This will stash the timing 27 information when SPL finishes and load it when U-Boot proper starts 28 up. 29 30config BOOTSTAGE_REPORT 31 bool "Display a detailed boot timing report before booting the OS" 32 depends on BOOTSTAGE 33 help 34 Enable output of a boot time report just before the OS is booted. 35 This shows how long it took U-Boot to go through each stage of the 36 boot process. The report looks something like this: 37 38 Timer summary in microseconds: 39 Mark Elapsed Stage 40 0 0 reset 41 3,575,678 3,575,678 board_init_f start 42 3,575,695 17 arch_cpu_init A9 43 3,575,777 82 arch_cpu_init done 44 3,659,598 83,821 board_init_r start 45 3,910,375 250,777 main_loop 46 29,916,167 26,005,792 bootm_start 47 30,361,327 445,160 start_kernel 48 49config BOOTSTAGE_USER_COUNT 50 int "Number of boot ID numbers available for user use" 51 default 20 52 help 53 This is the number of available user bootstage records. 54 Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...) 55 a new ID will be allocated from this stash. If you exceed 56 the limit, recording will stop. 57 58config BOOTSTAGE_RECORD_COUNT 59 int "Number of boot stage records to store" 60 default 30 61 help 62 This is the size of the bootstage record list and is the maximum 63 number of bootstage records that can be recorded. 64 65config BOOTSTAGE_FDT 66 bool "Store boot timing information in the OS device tree" 67 depends on BOOTSTAGE 68 help 69 Stash the bootstage information in the FDT. A root 'bootstage' 70 node is created with each bootstage id as a child. Each child 71 has a 'name' property and either 'mark' containing the 72 mark time in microseconds, or 'accum' containing the 73 accumulated time for that bootstage id in microseconds. 74 For example: 75 76 bootstage { 77 154 { 78 name = "board_init_f"; 79 mark = <3575678>; 80 }; 81 170 { 82 name = "lcd"; 83 accum = <33482>; 84 }; 85 }; 86 87 Code in the Linux kernel can find this in /proc/devicetree. 88 89config BOOTSTAGE_STASH 90 bool "Stash the boot timing information in memory before booting OS" 91 depends on BOOTSTAGE 92 help 93 Some OSes do not support device tree. Bootstage can instead write 94 the boot timing information in a binary format at a given address. 95 This happens through a call to bootstage_stash(), typically in 96 the CPU's cleanup_before_linux() function. You can use the 97 'bootstage stash' and 'bootstage unstash' commands to do this on 98 the command line. 99 100config BOOTSTAGE_STASH_ADDR 101 hex "Address to stash boot timing information" 102 default 0 103 help 104 Provide an address which will not be overwritten by the OS when it 105 starts, so that it can read this information when ready. 106 107config BOOTSTAGE_STASH_SIZE 108 hex "Size of boot timing stash region" 109 default 0x1000 110 help 111 This should be large enough to hold the bootstage stash. A value of 112 4096 (4KiB) is normally plenty. 113 114endmenu 115 116menu "Boot media" 117 118config NOR_BOOT 119 bool "Support for booting from NOR flash" 120 depends on NOR 121 help 122 Enabling this will make a U-Boot binary that is capable of being 123 booted via NOR. In this case we will enable certain pinmux early 124 as the ROM only partially sets up pinmux. We also default to using 125 NOR for environment. 126 127config NAND_BOOT 128 bool "Support for booting from NAND flash" 129 default n 130 help 131 Enabling this will make a U-Boot binary that is capable of being 132 booted via NAND flash. This is not a must, some SoCs need this, 133 some not. 134 135config ONENAND_BOOT 136 bool "Support for booting from ONENAND" 137 default n 138 help 139 Enabling this will make a U-Boot binary that is capable of being 140 booted via ONENAND. This is not a must, some SoCs need this, 141 some not. 142 143config QSPI_BOOT 144 bool "Support for booting from QSPI flash" 145 default n 146 help 147 Enabling this will make a U-Boot binary that is capable of being 148 booted via QSPI flash. This is not a must, some SoCs need this, 149 some not. 150 151config SATA_BOOT 152 bool "Support for booting from SATA" 153 default n 154 help 155 Enabling this will make a U-Boot binary that is capable of being 156 booted via SATA. This is not a must, some SoCs need this, 157 some not. 158 159config SD_BOOT 160 bool "Support for booting from SD/EMMC" 161 default n 162 help 163 Enabling this will make a U-Boot binary that is capable of being 164 booted via SD/EMMC. This is not a must, some SoCs need this, 165 some not. 166 167config SPI_BOOT 168 bool "Support for booting from SPI flash" 169 default n 170 help 171 Enabling this will make a U-Boot binary that is capable of being 172 booted via SPI flash. This is not a must, some SoCs need this, 173 some not. 174 175endmenu 176 177menu "Environment" 178 179config ENV_IS_IN_DATAFLASH 180 bool "Environment in dataflash" 181 depends on !CHAIN_OF_TRUST 182 help 183 Define this if you have a DataFlash memory device which you 184 want to use for the environment. 185 186 - CONFIG_ENV_OFFSET: 187 - CONFIG_ENV_ADDR: 188 - CONFIG_ENV_SIZE: 189 190 These three #defines specify the offset and size of the 191 environment area within the total memory of your DataFlash placed 192 at the specified address. 193 194config ENV_IS_IN_EEPROM 195 bool "Environment in EEPROM" 196 depends on !CHAIN_OF_TRUST 197 help 198 Use this if you have an EEPROM or similar serial access 199 device and a driver for it. 200 201 - CONFIG_ENV_OFFSET: 202 - CONFIG_ENV_SIZE: 203 204 These two #defines specify the offset and size of the 205 environment area within the total memory of your EEPROM. 206 207 - CONFIG_SYS_I2C_EEPROM_ADDR: 208 If defined, specified the chip address of the EEPROM device. 209 The default address is zero. 210 211 - CONFIG_SYS_I2C_EEPROM_BUS: 212 If defined, specified the i2c bus of the EEPROM device. 213 214 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: 215 If defined, the number of bits used to address bytes in a 216 single page in the EEPROM device. A 64 byte page, for example 217 would require six bits. 218 219 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: 220 If defined, the number of milliseconds to delay between 221 page writes. The default is zero milliseconds. 222 223 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN: 224 The length in bytes of the EEPROM memory array address. Note 225 that this is NOT the chip address length! 226 227 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: 228 EEPROM chips that implement "address overflow" are ones 229 like Catalyst 24WC04/08/16 which has 9/10/11 bits of 230 address and the extra bits end up in the "chip address" bit 231 slots. This makes a 24WC08 (1Kbyte) chip look like four 256 232 byte chips. 233 234 Note that we consider the length of the address field to 235 still be one byte because the extra address bits are hidden 236 in the chip address. 237 238 - CONFIG_SYS_EEPROM_SIZE: 239 The size in bytes of the EEPROM device. 240 241 - CONFIG_ENV_EEPROM_IS_ON_I2C 242 define this, if you have I2C and SPI activated, and your 243 EEPROM, which holds the environment, is on the I2C bus. 244 245 - CONFIG_I2C_ENV_EEPROM_BUS 246 if you have an Environment on an EEPROM reached over 247 I2C muxes, you can define here, how to reach this 248 EEPROM. For example: 249 250 #define CONFIG_I2C_ENV_EEPROM_BUS 1 251 252 EEPROM which holds the environment, is reached over 253 a pca9547 i2c mux with address 0x70, channel 3. 254 255config ENV_IS_IN_FLASH 256 bool "Environment in flash memory" 257 depends on !CHAIN_OF_TRUST 258 help 259 Define this if you have a flash device which you want to use for the 260 environment. 261 262 a) The environment occupies one whole flash sector, which is 263 "embedded" in the text segment with the U-Boot code. This 264 happens usually with "bottom boot sector" or "top boot 265 sector" type flash chips, which have several smaller 266 sectors at the start or the end. For instance, such a 267 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 268 such a case you would place the environment in one of the 269 4 kB sectors - with U-Boot code before and after it. With 270 "top boot sector" type flash chips, you would put the 271 environment in one of the last sectors, leaving a gap 272 between U-Boot and the environment. 273 274 CONFIG_ENV_OFFSET: 275 276 Offset of environment data (variable area) to the 277 beginning of flash memory; for instance, with bottom boot 278 type flash chips the second sector can be used: the offset 279 for this sector is given here. 280 281 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. 282 283 CONFIG_ENV_ADDR: 284 285 This is just another way to specify the start address of 286 the flash sector containing the environment (instead of 287 CONFIG_ENV_OFFSET). 288 289 CONFIG_ENV_SECT_SIZE: 290 291 Size of the sector containing the environment. 292 293 294 b) Sometimes flash chips have few, equal sized, BIG sectors. 295 In such a case you don't want to spend a whole sector for 296 the environment. 297 298 CONFIG_ENV_SIZE: 299 300 If you use this in combination with CONFIG_ENV_IS_IN_FLASH 301 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part 302 of this flash sector for the environment. This saves 303 memory for the RAM copy of the environment. 304 305 It may also save flash memory if you decide to use this 306 when your environment is "embedded" within U-Boot code, 307 since then the remainder of the flash sector could be used 308 for U-Boot code. It should be pointed out that this is 309 STRONGLY DISCOURAGED from a robustness point of view: 310 updating the environment in flash makes it always 311 necessary to erase the WHOLE sector. If something goes 312 wrong before the contents has been restored from a copy in 313 RAM, your target system will be dead. 314 315 CONFIG_ENV_ADDR_REDUND 316 CONFIG_ENV_SIZE_REDUND 317 318 These settings describe a second storage area used to hold 319 a redundant copy of the environment data, so that there is 320 a valid backup copy in case there is a power failure during 321 a "saveenv" operation. 322 323 BE CAREFUL! Any changes to the flash layout, and some changes to the 324 source code will make it necessary to adapt <board>/u-boot.lds* 325 accordingly! 326 327config ENV_IS_IN_MMC 328 bool "Environment in an MMC device" 329 depends on !CHAIN_OF_TRUST 330 default y if ARCH_SUNXI 331 help 332 Define this if you have an MMC device which you want to use for the 333 environment. 334 335 CONFIG_SYS_MMC_ENV_DEV: 336 337 Specifies which MMC device the environment is stored in. 338 339 CONFIG_SYS_MMC_ENV_PART (optional): 340 341 Specifies which MMC partition the environment is stored in. If not 342 set, defaults to partition 0, the user area. Common values might be 343 1 (first MMC boot partition), 2 (second MMC boot partition). 344 345 CONFIG_ENV_OFFSET: 346 CONFIG_ENV_SIZE: 347 348 These two #defines specify the offset and size of the environment 349 area within the specified MMC device. 350 351 If offset is positive (the usual case), it is treated as relative to 352 the start of the MMC partition. If offset is negative, it is treated 353 as relative to the end of the MMC partition. This can be useful if 354 your board may be fitted with different MMC devices, which have 355 different sizes for the MMC partitions, and you always want the 356 environment placed at the very end of the partition, to leave the 357 maximum possible space before it, to store other data. 358 359 These two values are in units of bytes, but must be aligned to an 360 MMC sector boundary. 361 362 CONFIG_ENV_OFFSET_REDUND (optional): 363 364 Specifies a second storage area, of CONFIG_ENV_SIZE size, used to 365 hold a redundant copy of the environment data. This provides a 366 valid backup copy in case the other copy is corrupted, e.g. due 367 to a power failure during a "saveenv" operation. 368 369 This value may also be positive or negative; this is handled in the 370 same way as CONFIG_ENV_OFFSET. 371 372 This value is also in units of bytes, but must also be aligned to 373 an MMC sector boundary. 374 375 CONFIG_ENV_SIZE_REDUND (optional): 376 377 This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is 378 set. If this value is set, it must be set to the same value as 379 CONFIG_ENV_SIZE. 380 381config ENV_IS_IN_NAND 382 bool "Environment in a NAND device" 383 depends on !CHAIN_OF_TRUST 384 help 385 Define this if you have a NAND device which you want to use for the 386 environment. 387 388 - CONFIG_ENV_OFFSET: 389 - CONFIG_ENV_SIZE: 390 391 These two #defines specify the offset and size of the environment 392 area within the first NAND device. CONFIG_ENV_OFFSET must be 393 aligned to an erase block boundary. 394 395 - CONFIG_ENV_OFFSET_REDUND (optional): 396 397 This setting describes a second storage area of CONFIG_ENV_SIZE 398 size used to hold a redundant copy of the environment data, so 399 that there is a valid backup copy in case there is a power failure 400 during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be 401 aligned to an erase block boundary. 402 403 - CONFIG_ENV_RANGE (optional): 404 405 Specifies the length of the region in which the environment 406 can be written. This should be a multiple of the NAND device's 407 block size. Specifying a range with more erase blocks than 408 are needed to hold CONFIG_ENV_SIZE allows bad blocks within 409 the range to be avoided. 410 411 - CONFIG_ENV_OFFSET_OOB (optional): 412 413 Enables support for dynamically retrieving the offset of the 414 environment from block zero's out-of-band data. The 415 "nand env.oob" command can be used to record this offset. 416 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when 417 using CONFIG_ENV_OFFSET_OOB. 418 419config ENV_IS_IN_NVRAM 420 bool "Environment in a non-volatile RAM" 421 depends on !CHAIN_OF_TRUST 422 help 423 Define this if you have some non-volatile memory device 424 (NVRAM, battery buffered SRAM) which you want to use for the 425 environment. 426 427 - CONFIG_ENV_ADDR: 428 - CONFIG_ENV_SIZE: 429 430 These two #defines are used to determine the memory area you 431 want to use for environment. It is assumed that this memory 432 can just be read and written to, without any special 433 provision. 434 435config ENV_IS_IN_REMOTE 436 bool "Environment is in remove memory space" 437 depends on !CHAIN_OF_TRUST 438 help 439 Define this if you have a remote memory space which you 440 want to use for the local device's environment. 441 442 - CONFIG_ENV_ADDR: 443 - CONFIG_ENV_SIZE: 444 445 These two #defines specify the address and size of the 446 environment area within the remote memory space. The 447 local device can get the environment from remote memory 448 space by SRIO or PCIE links. 449 450config ENV_IS_IN_SPI_FLASH 451 bool "Environment is in SPI flash" 452 depends on !CHAIN_OF_TRUST 453 help 454 Define this if you have a SPI Flash memory device which you 455 want to use for the environment. 456 457 - CONFIG_ENV_OFFSET: 458 - CONFIG_ENV_SIZE: 459 460 These two #defines specify the offset and size of the 461 environment area within the SPI Flash. CONFIG_ENV_OFFSET must be 462 aligned to an erase sector boundary. 463 464 - CONFIG_ENV_SECT_SIZE: 465 466 Define the SPI flash's sector size. 467 468 - CONFIG_ENV_OFFSET_REDUND (optional): 469 470 This setting describes a second storage area of CONFIG_ENV_SIZE 471 size used to hold a redundant copy of the environment data, so 472 that there is a valid backup copy in case there is a power failure 473 during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be 474 aligned to an erase sector boundary. 475 476 - CONFIG_ENV_SPI_BUS (optional): 477 - CONFIG_ENV_SPI_CS (optional): 478 479 Define the SPI bus and chip select. If not defined they will be 0. 480 481 - CONFIG_ENV_SPI_MAX_HZ (optional): 482 483 Define the SPI max work clock. If not defined then use 1MHz. 484 485 - CONFIG_ENV_SPI_MODE (optional): 486 487 Define the SPI work mode. If not defined then use SPI_MODE_3. 488 489config ENV_IS_IN_UBI 490 bool "Environment in a UBI volume" 491 depends on !CHAIN_OF_TRUST 492 help 493 Define this if you have an UBI volume that you want to use for the 494 environment. This has the benefit of wear-leveling the environment 495 accesses, which is important on NAND. 496 497 - CONFIG_ENV_UBI_PART: 498 499 Define this to a string that is the mtd partition containing the UBI. 500 501 - CONFIG_ENV_UBI_VOLUME: 502 503 Define this to the name of the volume that you want to store the 504 environment in. 505 506 - CONFIG_ENV_UBI_VOLUME_REDUND: 507 508 Define this to the name of another volume to store a second copy of 509 the environment in. This will enable redundant environments in UBI. 510 It is assumed that both volumes are in the same MTD partition. 511 512 - CONFIG_UBI_SILENCE_MSG 513 - CONFIG_UBIFS_SILENCE_MSG 514 515 You will probably want to define these to avoid a really noisy system 516 when storing the env in UBI. 517 518config ENV_IS_NOWHERE 519 bool "Environment is not stored" 520 help 521 Define this if you don't want to or can't have an environment stored 522 on a storage medium 523 524if ARCH_SUNXI 525 526config ENV_OFFSET 527 hex "Environment Offset" 528 depends on !ENV_IS_IN_UBI 529 depends on !ENV_IS_NOWHERE 530 default 0x88000 if ARCH_SUNXI 531 help 532 Offset from the start of the device (or partition) 533 534config ENV_SIZE 535 hex "Environment Size" 536 depends on !ENV_IS_NOWHERE 537 default 0x20000 if ARCH_SUNXI 538 help 539 Size of the environment storage area 540 541config ENV_UBI_PART 542 string "UBI partition name" 543 depends on ENV_IS_IN_UBI 544 help 545 MTD partition containing the UBI device 546 547config ENV_UBI_VOLUME 548 string "UBI volume name" 549 depends on ENV_IS_IN_UBI 550 help 551 Name of the volume that you want to store the environment in. 552 553endif 554 555endmenu 556 557config BOOTDELAY 558 int "delay in seconds before automatically booting" 559 default 2 560 depends on AUTOBOOT 561 help 562 Delay before automatically running bootcmd; 563 set to 0 to autoboot with no delay, but you can stop it by key input. 564 set to -1 to disable autoboot. 565 set to -2 to autoboot with no delay and not check for abort 566 567 See doc/README.autoboot for details. 568 569menu "Console" 570 571config MENU 572 bool 573 help 574 This is the library functionality to provide a text-based menu of 575 choices for the user to make choices with. 576 577config CONSOLE_RECORD 578 bool "Console recording" 579 help 580 This provides a way to record console output (and provide console 581 input) through circular buffers. This is mostly useful for testing. 582 Console output is recorded even when the console is silent. 583 To enable console recording, call console_record_reset_enable() 584 from your code. 585 586config CONSOLE_RECORD_OUT_SIZE 587 hex "Output buffer size" 588 depends on CONSOLE_RECORD 589 default 0x400 if CONSOLE_RECORD 590 help 591 Set the size of the console output buffer. When this fills up, no 592 more data will be recorded until some is removed. The buffer is 593 allocated immediately after the malloc() region is ready. 594 595config CONSOLE_RECORD_IN_SIZE 596 hex "Input buffer size" 597 depends on CONSOLE_RECORD 598 default 0x100 if CONSOLE_RECORD 599 help 600 Set the size of the console input buffer. When this contains data, 601 tstc() and getc() will use this in preference to real device input. 602 The buffer is allocated immediately after the malloc() region is 603 ready. 604 605config IDENT_STRING 606 string "Board specific string to be added to uboot version string" 607 help 608 This options adds the board specific name to u-boot version. 609 610config SILENT_CONSOLE 611 bool "Support a silent console" 612 help 613 This option allows the console to be silenced, meaning that no 614 output will appear on the console devices. This is controlled by 615 setting the environment vaariable 'silent' to a non-empty value. 616 Note this also silences the console when booting Linux. 617 618 When the console is set up, the variable is checked, and the 619 GD_FLG_SILENT flag is set. Changing the environment variable later 620 will update the flag. 621 622config SILENT_U_BOOT_ONLY 623 bool "Only silence the U-Boot console" 624 depends on SILENT_CONSOLE 625 help 626 Normally when the U-Boot console is silenced, Linux's console is 627 also silenced (assuming the board boots into Linux). This option 628 allows the linux console to operate normally, even if U-Boot's 629 is silenced. 630 631config SILENT_CONSOLE_UPDATE_ON_SET 632 bool "Changes to the 'silent' environment variable update immediately" 633 depends on SILENT_CONSOLE 634 default y if SILENT_CONSOLE 635 help 636 When the 'silent' environment variable is changed, update the 637 console silence flag immediately. This allows 'setenv' to be used 638 to silence or un-silence the console. 639 640 The effect is that any change to the variable will affect the 641 GD_FLG_SILENT flag. 642 643config SILENT_CONSOLE_UPDATE_ON_RELOC 644 bool "Allow flags to take effect on relocation" 645 depends on SILENT_CONSOLE 646 help 647 In some cases the environment is not available until relocation 648 (e.g. NAND). This option makes the value of the 'silent' 649 environment variable take effect at relocation. 650 651config PRE_CONSOLE_BUFFER 652 bool "Buffer characters before the console is available" 653 help 654 Prior to the console being initialised (i.e. serial UART 655 initialised etc) all console output is silently discarded. 656 Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to 657 buffer any console messages prior to the console being 658 initialised to a buffer. The buffer is a circular buffer, so 659 if it overflows, earlier output is discarded. 660 661 Note that this is not currently supported in SPL. It would be 662 useful to be able to share the pre-console buffer with SPL. 663 664config PRE_CON_BUF_SZ 665 int "Sets the size of the pre-console buffer" 666 depends on PRE_CONSOLE_BUFFER 667 default 4096 668 help 669 The size of the pre-console buffer affects how much console output 670 can be held before it overflows and starts discarding earlier 671 output. Normally there is very little output at this early stage, 672 unless debugging is enabled, so allow enough for ~10 lines of 673 text. 674 675 This is a useful feature if you are using a video console and 676 want to see the full boot output on the console. Without this 677 option only the post-relocation output will be displayed. 678 679config PRE_CON_BUF_ADDR 680 hex "Address of the pre-console buffer" 681 depends on PRE_CONSOLE_BUFFER 682 default 0x2f000000 if ARCH_SUNXI && MACH_SUN9I 683 default 0x4f000000 if ARCH_SUNXI && !MACH_SUN9I 684 help 685 This sets the start address of the pre-console buffer. This must 686 be in available memory and is accessed before relocation and 687 possibly before DRAM is set up. Therefore choose an address 688 carefully. 689 690 We should consider removing this option and allocating the memory 691 in board_init_f_init_reserve() instead. 692 693config CONSOLE_MUX 694 bool "Enable console multiplexing" 695 default y if DM_VIDEO || VIDEO || LCD 696 help 697 This allows multiple devices to be used for each console 'file'. 698 For example, stdout can be set to go to serial and video. 699 Similarly, stdin can be set to come from serial and keyboard. 700 Input can be provided from either source. Console multiplexing 701 adds a small amount of size to U-Boot. Changes to the environment 702 variables stdout, stdin and stderr will take effect immediately. 703 704config SYS_CONSOLE_IS_IN_ENV 705 bool "Select console devices from the environment" 706 default y if CONSOLE_MUX 707 help 708 This allows multiple input/output devices to be set at boot time. 709 For example, if stdout is set to "serial,video" then output will 710 be sent to both the serial and video devices on boot. The 711 environment variables can be updated after boot to change the 712 input/output devices. 713 714config SYS_CONSOLE_OVERWRITE_ROUTINE 715 bool "Allow board control over console overwriting" 716 help 717 If this is enabled, and the board-specific function 718 overwrite_console() returns 1, the stdin, stderr and stdout are 719 switched to the serial port, else the settings in the environment 720 are used. If this is not enabled, the console will not be switched 721 to serial. 722 723config SYS_CONSOLE_ENV_OVERWRITE 724 bool "Update environment variables during console init" 725 help 726 The console environment variables (stdout, stdin, stderr) can be 727 used to determine the correct console devices on start-up. This 728 option writes the console devices to these variables on console 729 start-up (after relocation). This causes the environment to be 730 updated to match the console devices actually chosen. 731 732config SYS_CONSOLE_INFO_QUIET 733 bool "Don't display the console devices on boot" 734 help 735 Normally U-Boot displays the current settings for stdout, stdin 736 and stderr on boot when the post-relocation console is set up. 737 Enable this option to supress this output. It can be obtained by 738 calling stdio_print_current_devices() from board code. 739 740config SYS_STDIO_DEREGISTER 741 bool "Allow deregistering stdio devices" 742 default y if USB_KEYBOARD 743 help 744 Generally there is no need to deregister stdio devices since they 745 are never deactivated. But if a stdio device is used which can be 746 removed (for example a USB keyboard) then this option can be 747 enabled to ensure this is handled correctly. 748 749endmenu 750 751config DTB_RESELECT 752 bool "Support swapping dtbs at a later point in boot" 753 depends on FIT_EMBED 754 help 755 It is possible during initial boot you may need to use a generic 756 dtb until you can fully determine the board your running on. This 757 config allows boards to implement a function at a later point 758 during boot to switch to the "correct" dtb. 759 760config FIT_EMBED 761 bool "Support a FIT image embedded in the U-boot image" 762 help 763 This option provides hooks to allow U-boot to parse an 764 appended FIT image and enable board specific code to then select 765 the correct DTB to be used. 766 767config DEFAULT_FDT_FILE 768 string "Default fdt file" 769 help 770 This option is used to set the default fdt file to boot OS. 771 772config VERSION_VARIABLE 773 bool "add U-Boot environment variable vers" 774 default n 775 help 776 If this variable is defined, an environment variable 777 named "ver" is created by U-Boot showing the U-Boot 778 version as printed by the "version" command. 779 Any change to this variable will be reverted at the 780 next reset. 781 782config BOARD_LATE_INIT 783 bool 784 help 785 Sometimes board require some initialization code that might 786 require once the actual init done, example saving board specific env, 787 boot-modes etc. which eventually done at late. 788 789 So this config enable the late init code with the help of board_late_init 790 function which should defined on respective boards. 791 792config DISPLAY_CPUINFO 793 bool "Display information about the CPU during start up" 794 default y if ARM || NIOS2 || X86 || XTENSA 795 help 796 Display information about the CPU that U-Boot is running on 797 when U-Boot starts up. The function print_cpuinfo() is called 798 to do this. 799 800config DISPLAY_BOARDINFO 801 bool "Display information about the board during start up" 802 default y if ARM || M68K || MIPS || PPC || SANDBOX || XTENSA 803 help 804 Display information about the board that U-Boot is running on 805 when U-Boot starts up. The board function checkboard() is called 806 to do this. 807 808menu "Start-up hooks" 809 810config ARCH_EARLY_INIT_R 811 bool "Call arch-specific init soon after relocation" 812 default y if X86 813 help 814 With this option U-Boot will call arch_early_init_r() soon after 815 relocation. Driver model is running by this point, and the cache 816 is on. Note that board_early_init_r() is called first, if 817 enabled. This can be used to set up architecture-specific devices. 818 819config ARCH_MISC_INIT 820 bool "Call arch-specific init after relocation, when console is ready" 821 help 822 With this option U-Boot will call arch_misc_init() after 823 relocation to allow miscellaneous arch-dependent initialisation 824 to be performed. This function should be defined by the board 825 and will be called after the console is set up, after relocaiton. 826 827config BOARD_EARLY_INIT_F 828 bool "Call board-specific init before relocation" 829 default y if X86 830 help 831 Some boards need to perform initialisation as soon as possible 832 after boot. With this option, U-Boot calls board_early_init_f() 833 after driver model is ready in the pre-relocation init sequence. 834 Note that the normal serial console is not yet set up, but the 835 debug UART will be available if enabled. 836 837endmenu 838 839menu "Security support" 840 841config HASH 842 bool # "Support hashing API (SHA1, SHA256, etc.)" 843 help 844 This provides a way to hash data in memory using various supported 845 algorithms (such as SHA1, MD5, CRC32). The API is defined in hash.h 846 and the algorithms it supports are defined in common/hash.c. See 847 also CMD_HASH for command-line access. 848 849endmenu 850 851source "common/spl/Kconfig" 852