9 config SPL_DFU_NO_RESET
14 depends on SUPPORT_SPL
17 If you want to build SPL as well as the normal image, say Y.
20 bool "Support SPL based upon the common SPL framework"
24 Enable the SPL framework under common/spl/. This framework
25 supports MMC, NAND and YMODEM and other methods loading of U-Boot
26 and the Linux Kernel. If unsure, say Y.
29 bool "Pass hand-off information from SPL to U-Boot proper"
32 It is useful to be able to pass information from SPL to U-Boot
33 proper to preserve state that is known in SPL and is needed in U-Boot.
34 Enable this to locate the handoff information in U-Boot proper, early
35 in boot. It is available in gd->handoff. The state state is set up
36 in SPL (or TPL if that is being used).
41 bool "Pass hand-off information from SPL to U-Boot proper"
45 This option enables SPL to write handoff information. This can be
46 used to pass information like the size of SDRAM from SPL to U-Boot
47 proper. Also SPL can receive information from TPL in the same place
51 string "Linker script for the SPL stage"
52 default "arch/$(ARCH)/cpu/u-boot-spl.lds"
54 The SPL stage will usually require a different linker-script
55 (as it runs from a different memory region) than the regular
56 U-Boot stage. Set this to the path of the linker-script to
61 default ISW_ENTRY_ADDR if AM43XX || AM33XX || OMAP54XX || ARCH_KEYSTONE
64 The address in memory that SPL will be running from.
67 bool "Call board-specific initialization in SPL"
69 If this option is enabled, U-Boot will call the function
70 spl_board_init() from board_init_r(). This function should be
71 provided by the board.
73 config SPL_BOOTROM_SUPPORT
74 bool "Support returning to the BOOTROM"
76 Some platforms (e.g. the Rockchip RK3368) provide support in their
77 ROM for loading the next boot-stage after performing basic setup
80 Enable this option, to return to the BOOTROM through the
81 BOOT_DEVICE_BOOTROM (or fall-through to the next boot device in the
82 boot device list, if not implemented for a given board)
84 config SPL_BOOTCOUNT_LIMIT
85 bool "Support bootcount in SPL"
86 depends on SPL_ENV_SUPPORT
88 On some boards, which use 'falcon' mode, it is necessary to check
89 and increment the number of boot attempts. Such boards do not
90 use proper U-Boot for normal boot flow and hence needs those
91 adjustments to be done in the SPL.
93 config SPL_RAW_IMAGE_SUPPORT
94 bool "Support SPL loading and booting of RAW images"
95 default n if (ARCH_MX6 && (SPL_MMC_SUPPORT || SPL_SATA_SUPPORT))
96 default y if !TI_SECURE_DEVICE
98 SPL will support loading and booting a RAW image when this option
99 is y. If this is not set, SPL will move on to other available
100 boot media to find a suitable image.
102 config SPL_LEGACY_IMAGE_SUPPORT
103 bool "Support SPL loading and booting of Legacy images"
104 default y if !TI_SECURE_DEVICE
106 SPL will support loading and booting Legacy images when this option
107 is y. If this is not set, SPL will move on to other available
108 boot media to find a suitable image.
110 config SPL_LEGACY_IMAGE_CRC_CHECK
111 bool "Check CRC of Legacy images"
112 depends on SPL_LEGACY_IMAGE_SUPPORT
113 select SPL_CRC32_SUPPORT
115 Enable this to check the CRC of Legacy images. While this increases
116 reliability, it affects both code size and boot duration.
117 If disabled, Legacy images are booted if the image magic and size
118 are correct, without further integrity checks.
120 config SPL_SYS_MALLOC_SIMPLE
122 prompt "Only use malloc_simple functions in the SPL"
124 Say Y here to only use the *_simple malloc functions from
125 malloc_simple.c, rather then using the versions from dlmalloc.c;
126 this will make the SPL binary smaller at the cost of more heap
127 usage as the *_simple malloc functions do not re-use free-ed mem.
129 config TPL_SYS_MALLOC_SIMPLE
131 prompt "Only use malloc_simple functions in the TPL"
133 Say Y here to only use the *_simple malloc functions from
134 malloc_simple.c, rather then using the versions from dlmalloc.c;
135 this will make the TPL binary smaller at the cost of more heap
136 usage as the *_simple malloc functions do not re-use free-ed mem.
139 bool "Enable SDRAM location for SPL stack"
141 SPL starts off execution in SRAM and thus typically has only a small
142 stack available. Since SPL sets up DRAM while in its board_init_f()
143 function, it is possible for the stack to move there before
144 board_init_r() is reached. This option enables a special SDRAM
145 location for the SPL stack. U-Boot SPL switches to this after
146 board_init_f() completes, and before board_init_r() starts.
148 config SPL_STACK_R_ADDR
149 depends on SPL_STACK_R
150 hex "SDRAM location for SPL stack"
151 default 0x82000000 if ARCH_OMAP2PLUS
153 Specify the address in SDRAM for the SPL stack. This will be set up
154 before board_init_r() is called.
156 config SPL_STACK_R_MALLOC_SIMPLE_LEN
157 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
158 hex "Size of malloc_simple heap after switching to DRAM SPL stack"
161 Specify the amount of the stack to use as memory pool for
162 malloc_simple after switching the stack to DRAM. This may be set
163 to give board_init_r() a larger heap then the initial heap in
164 SRAM which is limited to SYS_MALLOC_F_LEN bytes.
166 config SPL_SEPARATE_BSS
167 bool "BSS section is in a different memory region from text"
169 Some platforms need a large BSS region in SPL and can provide this
170 because RAM is already set up. In this case BSS can be moved to RAM.
171 This option should then be enabled so that the correct device tree
172 location is used. Normally we put the device tree at the end of BSS
173 but with this option enabled, it goes at _image_binary_end.
175 config SPL_BANNER_PRINT
176 bool "Enable output of the SPL banner 'U-Boot SPL ...'"
179 If this option is enabled, SPL will print the banner with version
180 info. Disabling this option could be useful to reduce TPL boot time
181 (e.g. approx. 6 ms faster, when output on i.MX6 with 115200 baud).
183 config TPL_BANNER_PRINT
184 bool "Enable output of the TPL banner 'U-Boot TPL ...'"
187 If this option is enabled, SPL will not print the banner with version
188 info. Disabling this option could be useful to reduce SPL boot time
189 (e.g. approx. 6 ms faster, when output on i.MX6 with 115200 baud).
191 config SPL_DISPLAY_PRINT
192 bool "Display a board-specific message in SPL"
194 If this option is enabled, U-Boot will call the function
195 spl_display_print() immediately after displaying the SPL console
196 banner ("U-Boot SPL ..."). This function should be provided by
199 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
200 bool "MMC raw mode: by sector"
201 default y if ARCH_SUNXI || ARCH_DAVINCI || ARCH_UNIPHIER || \
202 ARCH_MX6 || ARCH_MX7 || \
203 ARCH_ROCKCHIP || ARCH_MVEBU || ARCH_SOCFPGA || \
204 ARCH_AT91 || ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
205 OMAP44XX || OMAP54XX || AM33XX || AM43XX
207 Use sector number for specifying U-Boot location on MMC/SD in
210 config SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
211 hex "Address on the MMC to load U-Boot from"
212 depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
213 default 0x50 if ARCH_SUNXI
214 default 0x75 if ARCH_DAVINCI
215 default 0x8a if ARCH_MX6 || ARCH_MX7
216 default 0x100 if ARCH_UNIPHIER
217 default 0x140 if ARCH_MVEBU
218 default 0x200 if ARCH_SOCFPGA || ARCH_AT91
219 default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
220 OMAP54XX || AM33XX || AM43XX || ARCH_K3
221 default 0x4000 if ARCH_ROCKCHIP
223 Address on the MMC to load U-Boot from, when the MMC is being used
224 in raw mode. Units: MMC sectors (1 sector = 512 bytes).
226 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
227 bool "MMC Raw mode: by partition"
229 Use a partition for loading U-Boot when using MMC/SD in raw mode.
231 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
232 hex "Partition to use to load U-Boot from"
233 depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
236 Partition on the MMC to load U-Boot from when the MMC is being
239 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
240 bool "MMC raw mode: by partition type"
241 depends on DOS_PARTITION && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
243 Use partition type for specifying U-Boot partition on MMC/SD in
244 raw mode. U-Boot will be loaded from the first partition of this
247 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
248 hex "Partition Type on the MMC to load U-Boot from"
249 depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
251 Partition Type on the MMC to load U-Boot from, when the MMC is being
254 config SPL_CRC32_SUPPORT
256 default y if SPL_LEGACY_IMAGE_SUPPORT
258 Enable this to support CRC32 in uImages or FIT images within SPL.
259 This is a 32-bit checksum value that can be used to verify images.
260 For FIT images, this is the least secure type of checksum, suitable
261 for detected accidental image corruption. For secure applications you
262 should consider SHA1 or SHA256.
264 config SPL_MD5_SUPPORT
268 Enable this to support MD5 in FIT images within SPL. An MD5
269 checksum is a 128-bit hash value used to check that the image
270 contents have not been corrupted. Note that MD5 is not considered
271 secure as it is possible (with a brute-force attack) to adjust the
272 image while still retaining the same MD5 hash value. For secure
273 applications where images may be changed maliciously, you should
274 consider SHA1 or SHA256.
276 config SPL_SHA1_SUPPORT
281 Enable this to support SHA1 in FIT images within SPL. A SHA1
282 checksum is a 160-bit (20-byte) hash value used to check that the
283 image contents have not been corrupted or maliciously altered.
284 While SHA1 is fairly secure it is coming to the end of its life
285 due to the expanding computing power avaiable to brute-force
286 attacks. For more security, consider SHA256.
288 config SPL_SHA256_SUPPORT
289 bool "Support SHA256"
293 Enable this to support SHA256 in FIT images within SPL. A SHA256
294 checksum is a 256-bit (32-byte) hash value used to check that the
295 image contents have not been corrupted. SHA256 is recommended for
296 use in secure applications since (as at 2016) there is no known
297 feasible attack that could produce a 'collision' with differing
298 input data. Use this for the highest security. Note that only the
299 SHA256 variant is supported: SHA512 and others are not currently
302 config SPL_FIT_IMAGE_TINY
303 bool "Remove functionality from SPL FIT loading to reduce size"
305 default y if MACH_SUN50I || MACH_SUN50I_H5 || MACH_SUN50I_H6
306 default y if ARCH_IMX8M
308 Enable this to reduce the size of the FIT image loading code
309 in SPL, if space for the SPL binary is very tight.
311 This removes the detection of image types (which forces the
312 first image to be treated as having a U-Boot style calling
313 convention) and skips the recording of each loaded payload
314 (i.e. loadable) into the FDT (modifying the loaded FDT to
315 ensure this information is available to the next image
318 config SPL_CPU_SUPPORT
319 bool "Support CPU drivers"
321 Enable this to support CPU drivers in SPL. These drivers can set
322 up CPUs and provide information about them such as the model and
323 name. This can be useful in SPL since setting up the CPUs earlier
324 may improve boot performance. Enable this option to build the
325 drivers in drivers/cpu as part of an SPL build.
327 config SPL_CRYPTO_SUPPORT
328 bool "Support crypto drivers"
330 Enable crypto drivers in SPL. These drivers can be used to
331 accelerate secure boot processing in secure applications. Enable
332 this option to build the drivers in drivers/crypto as part of an
335 config SPL_HASH_SUPPORT
336 bool "Support hashing drivers"
340 Enable hashing drivers in SPL. These drivers can be used to
341 accelerate secure boot processing in secure applications. Enable
342 this option to build system-specific drivers for hash acceleration
343 as part of an SPL build.
345 config TPL_HASH_SUPPORT
346 bool "Support hashing drivers in TPL"
350 Enable hashing drivers in SPL. These drivers can be used to
351 accelerate secure boot processing in secure applications. Enable
352 this option to build system-specific drivers for hash acceleration
353 as part of an SPL build.
355 config SPL_DMA_SUPPORT
356 bool "Support DMA drivers"
358 Enable DMA (direct-memory-access) drivers in SPL. These drivers
359 can be used to handle memory-to-peripheral data transfer without
360 the CPU moving the data. Enable this option to build the drivers
361 in drivers/dma as part of an SPL build.
363 config SPL_DRIVERS_MISC_SUPPORT
364 bool "Support misc drivers"
366 Enable miscellaneous drivers in SPL. These drivers perform various
367 tasks that don't fall nicely into other categories, Enable this
368 option to build the drivers in drivers/misc as part of an SPL
369 build, for those that support building in SPL (not all drivers do).
371 config SPL_ENV_SUPPORT
372 bool "Support an environment"
374 Enable environment support in SPL. The U-Boot environment provides
375 a number of settings (essentially name/value pairs) which can
376 control many aspects of U-Boot's operation. Normally this is not
377 needed in SPL as it has a much simpler task with less
378 configuration. But some boards use this to support 'Falcon' boot
379 on EXT2 and FAT, where SPL boots directly into Linux without
380 starting U-Boot first. Enabling this option will make env_get()
381 and env_set() available in SPL.
384 bool "Support save environment"
385 depends on SPL_ENV_SUPPORT
386 select SPL_MMC_WRITE if ENV_IS_IN_MMC
388 Enable save environment support in SPL after setenv. By default
389 the saveenv option is not provided in SPL, but some boards need
390 this support in 'Falcon' boot, where SPL need to boot from
391 different images based on environment variable set by OS. For
392 example OS may set "reboot_image" environment variable to
393 "recovery" inorder to boot recovery image by SPL. The SPL read
394 "reboot_image" and act accordingly and change the reboot_image
395 to default mode using setenv and save the environment.
397 config SPL_ETH_SUPPORT
398 bool "Support Ethernet"
399 depends on SPL_ENV_SUPPORT
401 Enable access to the network subsystem and associated Ethernet
402 drivers in SPL. This permits SPL to load U-Boot over an Ethernet
403 link rather than from an on-board peripheral. Environment support
404 is required since the network stack uses a number of environment
405 variables. See also SPL_NET_SUPPORT.
408 bool "Support EXT filesystems"
410 Enable support for EXT2/3/4 filesystems with SPL. This permits
411 U-Boot (or Linux in Falcon mode) to be loaded from an EXT
412 filesystem from within SPL. Support for the underlying block
413 device (e.g. MMC or USB) must be enabled separately.
416 bool "Support FAT filesystems"
419 Enable support for FAT and VFAT filesystems with SPL. This
420 permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
421 filesystem from within SPL. Support for the underlying block
422 device (e.g. MMC or USB) must be enabled separately.
425 bool "Support write for FAT filesystems"
427 Enable write support for FAT and VFAT filesystems with SPL.
428 Support for the underlying block device (e.g. MMC or USB) must be
431 config SPL_FPGA_SUPPORT
434 Enable support for FPGAs in SPL. Field-programmable Gate Arrays
435 provide software-configurable hardware which is typically used to
436 implement peripherals (such as UARTs, LCD displays, MMC) or
437 accelerate custom processing functions, such as image processing
438 or machine learning. Sometimes it is useful to program the FPGA
439 as early as possible during boot, and this option can enable that
442 config SPL_GPIO_SUPPORT
443 bool "Support GPIO in SPL"
445 Enable support for GPIOs (General-purpose Input/Output) in SPL.
446 GPIOs allow U-Boot to read the state of an input line (high or
447 low) and set the state of an output line. This can be used to
448 drive LEDs, control power to various system parts and read user
449 input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
450 for example. Enable this option to build the drivers in
451 drivers/gpio as part of an SPL build.
453 config SPL_I2C_SUPPORT
456 Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
457 I2C works with a clock and data line which can be driven by a
458 one or more masters or slaves. It is a fairly complex bus but is
459 widely used as it only needs two lines for communication. Speeds of
460 400kbps are typical but up to 3.4Mbps is supported by some
461 hardware. I2C can be useful in SPL to configure power management
462 ICs (PMICs) before raising the CPU clock speed, for example.
463 Enable this option to build the drivers in drivers/i2c as part of
466 config SPL_LIBCOMMON_SUPPORT
467 bool "Support common libraries"
469 Enable support for common U-Boot libraries within SPL. These
470 libraries include common code to deal with U-Boot images,
471 environment and USB, for example. This option is enabled on many
472 boards. Enable this option to build the code in common/ as part of
475 config SPL_LIBDISK_SUPPORT
476 bool "Support disk partitions"
479 Enable support for disk partitions within SPL. 'Disk' is something
480 of a misnomer as it includes non-spinning media such as flash (as
481 used in MMC and USB sticks). Partitions provide a way for a disk
482 to be split up into separate regions, with a partition table placed
483 at the start or end which describes the location and size of each
484 'partition'. These partitions are typically uses as individual block
485 devices, typically with an EXT2 or FAT filesystem in each. This
486 option enables whatever partition support has been enabled in
487 U-Boot to also be used in SPL. It brings in the code in disk/.
489 config SPL_LIBGENERIC_SUPPORT
490 bool "Support generic libraries"
492 Enable support for generic U-Boot libraries within SPL. These
493 libraries include generic code to deal with device tree, hashing,
494 printf(), compression and the like. This option is enabled on many
495 boards. Enable this option to build the code in lib/ as part of an
498 config SPL_DM_MAILBOX
499 bool "Support Mailbox"
501 Enable support for Mailbox within SPL. This enable the inter
502 processor communication protocols tobe used within SPL. Enable
503 this option to build the drivers in drivers/mailbox as part of
506 config SPL_MMC_SUPPORT
509 select HAVE_BLOCK_DEVICE
511 Enable support for MMC (Multimedia Card) within SPL. This enables
512 the MMC protocol implementation and allows any enabled drivers to
513 be used within SPL. MMC can be used with or without disk partition
514 support depending on the application (SPL_LIBDISK_SUPPORT). Enable
515 this option to build the drivers in drivers/mmc as part of an SPL
519 bool "MMC/SD/SDIO card support for write operations in SPL"
520 depends on SPL_MMC_SUPPORT
523 Enable write access to MMC and SD Cards in SPL
526 config SPL_MPC8XXX_INIT_DDR_SUPPORT
527 bool "Support MPC8XXX DDR init"
529 Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
530 random-access memory) on the MPC8XXX family within SPL. This
531 allows DRAM to be set up before loading U-Boot into that DRAM,
534 config SPL_MTD_SUPPORT
535 bool "Support MTD drivers"
537 Enable support for MTD (Memory Technology Device) within SPL. MTD
538 provides a block interface over raw NAND and can also be used with
539 SPI flash. This allows SPL to load U-Boot from supported MTD
540 devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
541 to enable specific MTD drivers.
543 config SPL_MUSB_NEW_SUPPORT
544 bool "Support new Mentor Graphics USB"
546 Enable support for Mentor Graphics USB in SPL. This is a new
547 driver used by some boards. Enable this option to build
548 the drivers in drivers/usb/musb-new as part of an SPL build. The
549 old drivers are in drivers/usb/musb.
551 config SPL_NAND_SUPPORT
552 bool "Support NAND flash"
554 Enable support for NAND (Negative AND) flash in SPL. NAND flash
555 can be used to allow SPL to load U-Boot from supported devices.
556 This enables the drivers in drivers/mtd/nand/raw as part of an SPL
559 config SPL_NET_SUPPORT
560 bool "Support networking"
562 Enable support for network devices (such as Ethernet) in SPL.
563 This permits SPL to load U-Boot over a network link rather than
564 from an on-board peripheral. Environment support is required since
565 the network stack uses a number of environment variables. See also
569 config SPL_NET_VCI_STRING
570 string "BOOTP Vendor Class Identifier string sent by SPL"
572 As defined by RFC 2132 the vendor class identifier field can be
573 sent by the client to identify the vendor type and configuration
574 of a client. This is often used in practice to allow for the DHCP
575 server to specify different files to load depending on if the ROM,
576 SPL or U-Boot itself makes the request
577 endif # if SPL_NET_SUPPORT
579 config SPL_NO_CPU_SUPPORT
580 bool "Drop CPU code in SPL"
582 This is specific to the ARM926EJ-S CPU. It disables the standard
583 start.S start-up code, presumably so that a replacement can be
584 used on that CPU. You should not enable it unless you know what
587 config SPL_NOR_SUPPORT
588 bool "Support NOR flash"
590 Enable support for loading U-Boot from memory-mapped NOR (Negative
591 OR) flash in SPL. NOR flash is slow to write but fast to read, and
592 a memory-mapped device makes it very easy to access. Loading from
593 NOR is typically achieved with just a memcpy().
595 config SPL_XIP_SUPPORT
599 Enable support for execute in place of U-Boot or kernel image. There
600 is no need to copy image from flash to ram if flash supports execute
601 in place. Its very useful in systems having enough flash but not
602 enough ram to load the image.
604 config SPL_ONENAND_SUPPORT
605 bool "Support OneNAND flash"
607 Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
608 a type of NAND flash and therefore can be used to allow SPL to
609 load U-Boot from supported devices. This enables the drivers in
610 drivers/mtd/onenand as part of an SPL build.
613 bool "Activate Falcon Mode"
614 depends on !TI_SECURE_DEVICE
617 Enable booting directly to an OS from SPL.
618 for more info read doc/README.falcon
622 hex "addr, where OS is found"
623 depends on SPL_NOR_SUPPORT
625 Specify the address, where the OS image is found, which
632 default "tpl/u-boot-with-tpl.bin" if TPL
635 Payload for SPL boot. For backward compatibility, default to
636 u-boot.bin, i.e. RAW image without any header. In case of
637 TPL, tpl/u-boot-with-tpl.bin. For new boards, suggest to
641 bool "Support PCI drivers"
643 Enable support for PCI in SPL. For platforms that need PCI to boot,
644 or must perform some init using PCI in SPL, this provides the
645 necessary driver support. This enables the drivers in drivers/pci
646 as part of an SPL build.
648 config SPL_PCH_SUPPORT
649 bool "Support PCH drivers"
651 Enable support for PCH (Platform Controller Hub) devices in SPL.
652 These are used to set up GPIOs and the SPI peripheral early in
653 boot. This enables the drivers in drivers/pch as part of an SPL
656 config SPL_POST_MEM_SUPPORT
657 bool "Support POST drivers"
659 Enable support for POST (Power-on Self Test) in SPL. POST is a
660 procedure that checks that the hardware (CPU or board) appears to
661 be functionally correctly. It is a sanity check that can be
662 performed before booting. This enables the drivers in post/drivers
663 as part of an SPL build.
666 bool "Support reset drivers"
669 Enable support for reset control in SPL.
670 That can be useful in SPL to handle IP reset in driver, as in U-Boot,
671 by using the generic reset API provided by driver model.
672 This enables the drivers in drivers/reset as part of an SPL build.
674 config SPL_POWER_SUPPORT
675 bool "Support power drivers"
677 Enable support for power control in SPL. This includes support
678 for PMICs (Power-management Integrated Circuits) and some of the
679 features provided by PMICs. In particular, voltage regulators can
680 be used to enable/disable power and vary its voltage. That can be
681 useful in SPL to turn on boot peripherals and adjust CPU voltage
682 so that the clock speed can be increased. This enables the drivers
683 in drivers/power, drivers/power/pmic and drivers/power/regulator
684 as part of an SPL build.
686 config SPL_POWER_DOMAIN
687 bool "Support power domain drivers"
689 Enable support for power domain control in SPL. Many SoCs allow
690 power to be applied to or removed from portions of the SoC (power
691 domains). This may be used to save power. This API provides the
692 means to control such power management hardware. This enables
693 the drivers in drivers/power/domain as part of a SPL build.
695 config SPL_RAM_SUPPORT
696 bool "Support booting from RAM"
697 default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
699 Enable booting of an image in RAM. The image can be preloaded or
700 it can be loaded by SPL directly into RAM (e.g. using USB).
702 config SPL_RAM_DEVICE
703 bool "Support booting from preloaded image in RAM"
704 depends on SPL_RAM_SUPPORT
705 default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
707 Enable booting of an image already loaded in RAM. The image has to
708 be already in memory when SPL takes over, e.g. loaded by the boot
711 config SPL_REMOTEPROC
712 bool "Support REMOTEPROCS"
714 Enable support for REMOTEPROCs in SPL. This permits to load
715 a remote processor firmware in SPL.
717 config SPL_RTC_SUPPORT
718 bool "Support RTC drivers"
720 Enable RTC (Real-time Clock) support in SPL. This includes support
721 for reading and setting the time. Some RTC devices also have some
722 non-volatile (battery-backed) memory which is accessible if
723 needed. This enables the drivers in drivers/rtc as part of an SPL
726 config SPL_SATA_SUPPORT
727 bool "Support loading from SATA"
729 Enable support for SATA (Serial AT attachment) in SPL. This allows
730 use of SATA devices such as hard drives and flash drivers for
731 loading U-Boot. SATA is used in higher-end embedded systems and
732 can provide higher performance than MMC , at somewhat higher
733 expense and power consumption. This enables loading from SATA
734 using a configured device.
736 config SPL_SERIAL_SUPPORT
737 bool "Support serial"
741 Enable support for serial in SPL. This allows use of a serial UART
742 for displaying messages while SPL is running. It also brings in
743 printf() and panic() functions. This should normally be enabled
744 unless there are space reasons not to. Even then, consider
745 enabling USE_TINY_PRINTF which is a small printf() version.
747 config SPL_SPI_FLASH_SUPPORT
748 bool "Support SPI flash drivers"
750 Enable support for using SPI flash in SPL, and loading U-Boot from
751 SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
752 the SPI bus that is used to connect it to a system. It is a simple
753 but fast bidirectional 4-wire bus (clock, chip select and two data
754 lines). This enables the drivers in drivers/mtd/spi as part of an
755 SPL build. This normally requires SPL_SPI_SUPPORT.
757 if SPL_SPI_FLASH_SUPPORT
759 config SPL_SPI_FLASH_TINY
760 bool "Enable low footprint SPL SPI Flash support"
761 depends on !SPI_FLASH_BAR
762 default y if SPI_FLASH
764 Enable lightweight SPL SPI Flash support that supports just reading
765 data/images from flash. No support to write/erase flash. Enable
766 this if you have SPL size limitations and don't need full
767 fledged SPI flash support.
769 config SPL_SPI_FLASH_SFDP_SUPPORT
770 bool "SFDP table parsing support for SPI NOR flashes"
771 depends on !SPI_FLASH_BAR && !SPL_SPI_FLASH_TINY
773 Enable support for parsing and auto discovery of parameters for
774 SPI NOR flashes using Serial Flash Discoverable Parameters (SFDP)
775 tables as per JESD216 standard in SPL.
778 bool "Support loading from SPI flash"
780 Enable support for loading next stage, U-Boot or otherwise, from
781 SPI NOR in U-Boot SPL.
783 endif # SPL_SPI_FLASH_SUPPORT
785 config SPL_SPI_SUPPORT
786 bool "Support SPI drivers"
788 Enable support for using SPI in SPL. This is used for connecting
789 to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
790 more details on that. The SPI driver provides the transport for
791 data between the SPI flash and the CPU. This option can be used to
792 enable SPI drivers that are needed for other purposes also, such
796 bool "Driver support for thermal devices"
798 Enable support for temperature-sensing devices. Some SoCs have on-chip
799 temperature sensors to permit warnings, speed throttling or even
800 automatic power-off when the temperature gets too high or low. Other
801 devices may be discrete but connected on a suitable bus.
803 config SPL_USB_HOST_SUPPORT
804 bool "Support USB host drivers"
805 select HAVE_BLOCK_DEVICE
807 Enable access to USB (Universal Serial Bus) host devices so that
808 SPL can load U-Boot from a connected USB peripheral, such as a USB
809 flash stick. While USB takes a little longer to start up than most
810 buses, it is very flexible since many different types of storage
811 device can be attached. This option enables the drivers in
812 drivers/usb/host as part of an SPL build.
814 config SPL_USB_STORAGE
815 bool "Support loading from USB"
816 depends on SPL_USB_HOST_SUPPORT && !(BLK && !DM_USB)
818 Enable support for USB devices in SPL. This allows use of USB
819 devices such as hard drives and flash drivers for loading U-Boot.
820 The actual drivers are enabled separately using the normal U-Boot
821 config options. This enables loading from USB using a configured
824 config SPL_USB_GADGET
825 bool "Suppport USB Gadget drivers"
827 Enable USB Gadget API which allows to enable USB device functions
833 bool "Support USB Ethernet drivers"
835 Enable access to the USB network subsystem and associated
836 drivers in SPL. This permits SPL to load U-Boot over a
837 USB-connected Ethernet link (such as a USB Ethernet dongle) rather
838 than from an onboard peripheral. Environment support is required
839 since the network stack uses a number of environment variables.
840 See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
843 bool "Support DFU (Device Firmware Upgrade)"
844 select SPL_HASH_SUPPORT
845 select SPL_DFU_NO_RESET
846 depends on SPL_RAM_SUPPORT
848 This feature enables the DFU (Device Firmware Upgrade) in SPL with
849 RAM memory device support. The ROM code will load and execute
850 the SPL built with dfu. The user can load binaries (u-boot/kernel) to
851 selected device partition from host-pc using dfu-utils.
852 This feature is useful to flash the binaries to factory or bare-metal
853 boards using USB interface.
856 bool "DFU device selection"
861 depends on SPL_DFU && SPL_RAM_SUPPORT
863 select RAM/DDR memory device for loading binary images
864 (u-boot/kernel) to the selected device partition using
865 DFU and execute the u-boot/kernel from RAM.
869 config SPL_USB_SDP_SUPPORT
870 bool "Support SDP (Serial Download Protocol)"
872 Enable Serial Download Protocol (SDP) device support in SPL. This
873 allows to download images into memory and execute (jump to) them
874 using the same protocol as implemented by the i.MX family's boot ROM.
877 config SPL_WATCHDOG_SUPPORT
878 bool "Support watchdog drivers"
880 Enable support for watchdog drivers in SPL. A watchdog is
881 typically a hardware peripheral which can reset the system when it
882 detects no activity for a while (such as a software crash). This
883 enables the drivers in drivers/watchdog as part of an SPL build.
885 config SPL_YMODEM_SUPPORT
886 bool "Support loading using Ymodem"
887 depends on SPL_SERIAL_SUPPORT
889 While loading from serial is slow it can be a useful backup when
890 there is no other option. The Ymodem protocol provides a reliable
891 means of transmitting U-Boot over a serial line for using in SPL,
892 with a checksum to ensure correctness.
895 bool "Support ARM Trusted Firmware"
898 ATF(ARM Trusted Firmware) is a component for ARM AArch64 which
899 is loaded by SPL (which is considered as BL2 in ATF terminology).
900 More detail at: https://github.com/ARM-software/arm-trusted-firmware
902 config SPL_ATF_NO_PLATFORM_PARAM
903 bool "Pass no platform parameter"
906 While we expect to call a pointer to a valid FDT (or NULL)
907 as the platform parameter to an ATF, some ATF versions are
908 not U-Boot aware and have an insufficiently robust parameter
909 validation to gracefully reject a FDT being passed.
911 If this option is enabled, the spl_atf os-type handler will
912 always pass NULL for the platform parameter.
914 If your ATF is affected, say Y.
916 config SPL_AM33XX_ENABLE_RTC32K_OSC
917 bool "Enable the RTC32K OSC on AM33xx based platforms"
920 Enable access to the AM33xx RTC and select the external 32kHz clock
924 bool "Support OP-TEE Trusted OS"
927 OP-TEE is an open source Trusted OS which is loaded by SPL.
928 More detail at: https://github.com/OP-TEE/optee_os
932 depends on SUPPORT_TPL
935 If you want to build TPL as well as the normal image and SPL, say Y.
940 bool "Pass hand-off information from TPL to SPL and U-Boot proper"
944 This option enables TPL to write handoff information. This can be
945 used to pass information like the size of SDRAM from TPL to U-Boot
946 proper. The information is also available to SPL if it is useful
949 config TPL_BOARD_INIT
950 bool "Call board-specific initialization in TPL"
952 If this option is enabled, U-Boot will call the function
953 spl_board_init() from board_init_r(). This function should be
954 provided by the board.
957 string "Linker script for the TPL stage"
959 default "arch/arm/cpu/armv8/u-boot-spl.lds" if ARM64
960 default "arch/$(ARCH)/cpu/u-boot-spl.lds"
962 The TPL stage will usually require a different linker-script
963 (as it runs from a different memory region) than the regular
964 U-Boot stage. Set this to the path of the linker-script to
967 May be left empty to trigger the Makefile infrastructure to
968 fall back to the linker-script used for the SPL stage.
970 config TPL_NEEDS_SEPARATE_TEXT_BASE
971 bool "TPL needs a separate text-base"
975 Enable, if the TPL stage should not inherit its text-base
976 from the SPL stage. When enabled, a base address for the
977 .text sections of the TPL stage has to be set below.
979 config TPL_NEEDS_SEPARATE_STACK
980 bool "TPL needs a separate initial stack-pointer"
984 Enable, if the TPL stage should not inherit its initial
985 stack-pointer from the settings for the SPL stage.
988 hex "Base address for the .text section of the TPL stage"
989 depends on TPL_NEEDS_SEPARATE_TEXT_BASE
991 The base address for the .text section of the TPL stage.
994 int "Maximum size (in bytes) for the TPL stage"
998 The maximum size (in bytes) of the TPL stage.
1001 hex "Address of the initial stack-pointer for the TPL stage"
1002 depends on TPL_NEEDS_SEPARATE_STACK
1004 The address of the initial stack-pointer for the TPL stage.
1005 Usually this will be the (aligned) top-of-stack.
1007 config TPL_BOOTROM_SUPPORT
1008 bool "Support returning to the BOOTROM (from TPL)"
1010 Some platforms (e.g. the Rockchip RK3368) provide support in their
1011 ROM for loading the next boot-stage after performing basic setup
1014 Enable this option, to return to the BOOTROM through the
1015 BOOT_DEVICE_BOOTROM (or fall-through to the next boot device in the
1016 boot device list, if not implemented for a given board)
1018 config TPL_DRIVERS_MISC_SUPPORT
1019 bool "Support misc drivers in TPL"
1021 Enable miscellaneous drivers in TPL. These drivers perform various
1022 tasks that don't fall nicely into other categories, Enable this
1023 option to build the drivers in drivers/misc as part of an TPL
1024 build, for those that support building in TPL (not all drivers do).
1026 config TPL_ENV_SUPPORT
1027 bool "Support an environment"
1029 Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
1031 config TPL_GPIO_SUPPORT
1032 bool "Support GPIO in TPL"
1034 Enable support for GPIOs (General-purpose Input/Output) in TPL.
1035 GPIOs allow U-Boot to read the state of an input line (high or
1036 low) and set the state of an output line. This can be used to
1037 drive LEDs, control power to various system parts and read user
1038 input. GPIOs can be useful in TPL to enable a 'sign-of-life' LED,
1039 for example. Enable this option to build the drivers in
1040 drivers/gpio as part of an TPL build.
1042 config TPL_I2C_SUPPORT
1045 Enable support for the I2C bus in TPL. See SPL_I2C_SUPPORT for
1048 config TPL_LIBCOMMON_SUPPORT
1049 bool "Support common libraries"
1051 Enable support for common U-Boot libraries within TPL. See
1052 SPL_LIBCOMMON_SUPPORT for details.
1054 config TPL_LIBGENERIC_SUPPORT
1055 bool "Support generic libraries"
1057 Enable support for generic U-Boot libraries within TPL. See
1058 SPL_LIBGENERIC_SUPPORT for details.
1060 config TPL_MPC8XXX_INIT_DDR_SUPPORT
1061 bool "Support MPC8XXX DDR init"
1063 Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
1064 SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
1066 config TPL_MMC_SUPPORT
1070 Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
1072 config TPL_NAND_SUPPORT
1073 bool "Support NAND flash"
1075 Enable support for NAND in TPL. See SPL_NAND_SUPPORT for details.
1078 bool "Support PCI drivers"
1080 Enable support for PCI in TPL. For platforms that need PCI to boot,
1081 or must perform some init using PCI in SPL, this provides the
1082 necessary driver support. This enables the drivers in drivers/pci
1083 as part of a TPL build.
1085 config TPL_PCH_SUPPORT
1086 bool "Support PCH drivers"
1088 Enable support for PCH (Platform Controller Hub) devices in TPL.
1089 These are used to set up GPIOs and the SPI peripheral early in
1090 boot. This enables the drivers in drivers/pch as part of a TPL
1093 config TPL_RAM_SUPPORT
1094 bool "Support booting from RAM"
1096 Enable booting of an image in RAM. The image can be preloaded or
1097 it can be loaded by TPL directly into RAM (e.g. using USB).
1099 config TPL_RAM_DEVICE
1100 bool "Support booting from preloaded image in RAM"
1101 depends on TPL_RAM_SUPPORT
1103 Enable booting of an image already loaded in RAM. The image has to
1104 be already in memory when TPL takes over, e.g. loaded by the boot
1107 config TPL_RTC_SUPPORT
1108 bool "Support RTC drivers"
1110 Enable RTC (Real-time Clock) support in TPL. This includes support
1111 for reading and setting the time. Some RTC devices also have some
1112 non-volatile (battery-backed) memory which is accessible if
1113 needed. This enables the drivers in drivers/rtc as part of an TPL
1116 config TPL_SERIAL_SUPPORT
1117 bool "Support serial"
1121 Enable support for serial in TPL. See SPL_SERIAL_SUPPORT for
1124 config TPL_SPI_FLASH_SUPPORT
1125 bool "Support SPI flash drivers"
1127 Enable support for using SPI flash in TPL. See SPL_SPI_FLASH_SUPPORT
1131 bool "Support loading from SPI flash"
1132 depends on TPL_SPI_FLASH_SUPPORT
1134 Enable support for loading next stage, U-Boot or otherwise, from
1135 SPI NOR in U-Boot TPL.
1137 config TPL_SPI_SUPPORT
1138 bool "Support SPI drivers"
1140 Enable support for using SPI in TPL. See SPL_SPI_SUPPORT for
1143 config TPL_YMODEM_SUPPORT
1144 bool "Support loading using Ymodem"
1145 depends on TPL_SERIAL_SUPPORT
1147 While loading from serial is slow it can be a useful backup when
1148 there is no other option. The Ymodem protocol provides a reliable
1149 means of transmitting U-Boot over a serial line for using in TPL,
1150 with a checksum to ensure correctness.