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.
22 string "Linker script for the SPL stage"
23 default "arch/$(ARCH)/cpu/u-boot-spl.lds"
26 The SPL stage will usually require a different linker-script
27 (as it runs from a different memory region) than the regular
28 U-Boot stage. Set this to the path of the linker-script to
32 bool "Call board-specific initialization in SPL"
34 If this option is enabled, U-Boot will call the function
35 spl_board_init() from board_init_r(). This function should be
36 provided by the board.
38 config SPL_BOOTROM_SUPPORT
39 bool "Support returning to the BOOTROM"
41 Some platforms (e.g. the Rockchip RK3368) provide support in their
42 ROM for loading the next boot-stage after performing basic setup
45 Enable this option, to return to the BOOTROM through the
46 BOOT_DEVICE_BOOTROM (or fall-through to the next boot device in the
47 boot device list, if not implemented for a given board)
49 config SPL_RAW_IMAGE_SUPPORT
50 bool "Support SPL loading and booting of RAW images"
51 default n if (ARCH_MX6 && (SPL_MMC_SUPPORT || SPL_SATA_SUPPORT))
52 default y if !TI_SECURE_DEVICE
54 SPL will support loading and booting a RAW image when this option
55 is y. If this is not set, SPL will move on to other available
56 boot media to find a suitable image.
58 config SPL_LEGACY_IMAGE_SUPPORT
59 bool "Support SPL loading and booting of Legacy images"
60 default y if !TI_SECURE_DEVICE
62 SPL will support loading and booting Legacy images when this option
63 is y. If this is not set, SPL will move on to other available
64 boot media to find a suitable image.
66 config SPL_SYS_MALLOC_SIMPLE
68 prompt "Only use malloc_simple functions in the SPL"
70 Say Y here to only use the *_simple malloc functions from
71 malloc_simple.c, rather then using the versions from dlmalloc.c;
72 this will make the SPL binary smaller at the cost of more heap
73 usage as the *_simple malloc functions do not re-use free-ed mem.
75 config TPL_SYS_MALLOC_SIMPLE
77 prompt "Only use malloc_simple functions in the TPL"
79 Say Y here to only use the *_simple malloc functions from
80 malloc_simple.c, rather then using the versions from dlmalloc.c;
81 this will make the TPL binary smaller at the cost of more heap
82 usage as the *_simple malloc functions do not re-use free-ed mem.
85 bool "Enable SDRAM location for SPL stack"
87 SPL starts off execution in SRAM and thus typically has only a small
88 stack available. Since SPL sets up DRAM while in its board_init_f()
89 function, it is possible for the stack to move there before
90 board_init_r() is reached. This option enables a special SDRAM
91 location for the SPL stack. U-Boot SPL switches to this after
92 board_init_f() completes, and before board_init_r() starts.
94 config SPL_STACK_R_ADDR
95 depends on SPL_STACK_R
96 hex "SDRAM location for SPL stack"
97 default 0x82000000 if ARCH_OMAP2PLUS
99 Specify the address in SDRAM for the SPL stack. This will be set up
100 before board_init_r() is called.
102 config SPL_STACK_R_MALLOC_SIMPLE_LEN
103 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
104 hex "Size of malloc_simple heap after switching to DRAM SPL stack"
107 Specify the amount of the stack to use as memory pool for
108 malloc_simple after switching the stack to DRAM. This may be set
109 to give board_init_r() a larger heap then the initial heap in
110 SRAM which is limited to SYS_MALLOC_F_LEN bytes.
112 config SPL_SEPARATE_BSS
113 bool "BSS section is in a different memory region from text"
115 Some platforms need a large BSS region in SPL and can provide this
116 because RAM is already set up. In this case BSS can be moved to RAM.
117 This option should then be enabled so that the correct device tree
118 location is used. Normally we put the device tree at the end of BSS
119 but with this option enabled, it goes at _image_binary_end.
121 config SPL_DISPLAY_PRINT
122 bool "Display a board-specific message in SPL"
124 If this option is enabled, U-Boot will call the function
125 spl_display_print() immediately after displaying the SPL console
126 banner ("U-Boot SPL ..."). This function should be provided by
129 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
130 bool "MMC raw mode: by sector"
131 default y if ARCH_SUNXI || ARCH_DAVINCI || ARCH_UNIPHIER ||ARCH_MX6 || \
132 ARCH_ROCKCHIP || ARCH_MVEBU || ARCH_SOCFPGA || \
133 ARCH_AT91 || ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
134 OMAP44XX || OMAP54XX || AM33XX || AM43XX
136 Use sector number for specifying U-Boot location on MMC/SD in
139 config SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
140 hex "Address on the MMC to load U-Boot from"
141 depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
142 default 0x50 if ARCH_SUNXI
143 default 0x75 if ARCH_DAVINCI
144 default 0x8a if ARCH_MX6
145 default 0x100 if ARCH_ROCKCHIP || ARCH_UNIPHIER
146 default 0x140 if ARCH_MVEBU
147 default 0x200 if ARCH_SOCFPGA || ARCH_AT91
148 default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
149 OMAP54XX || AM33XX || AM43XX
151 Address on the MMC to load U-Boot from, when the MMC is being used
152 in raw mode. Units: MMC sectors (1 sector = 512 bytes).
154 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
155 bool "MMC Raw mode: by partition"
157 Use a partition for loading U-Boot when using MMC/SD in raw mode.
159 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
160 hex "Partition to use to load U-Boot from"
161 depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
164 Partition on the MMC to load U-Boot from when the MMC is being
167 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
168 bool "MMC raw mode: by partition type"
169 depends on DOS_PARTITION && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
171 Use partition type for specifying U-Boot partition on MMC/SD in
172 raw mode. U-Boot will be loaded from the first partition of this
175 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
176 hex "Partition Type on the MMC to load U-Boot from"
177 depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
179 Partition Type on the MMC to load U-Boot from, when the MMC is being
182 config SPL_CRC32_SUPPORT
186 Enable this to support CRC32 in FIT images within SPL. This is a
187 32-bit checksum value that can be used to verify images. This is
188 the least secure type of checksum, suitable for detected
189 accidental image corruption. For secure applications you should
190 consider SHA1 or SHA256.
192 config SPL_MD5_SUPPORT
196 Enable this to support MD5 in FIT images within SPL. An MD5
197 checksum is a 128-bit hash value used to check that the image
198 contents have not been corrupted. Note that MD5 is not considered
199 secure as it is possible (with a brute-force attack) to adjust the
200 image while still retaining the same MD5 hash value. For secure
201 applications where images may be changed maliciously, you should
202 consider SHA1 or SHA256.
204 config SPL_SHA1_SUPPORT
209 Enable this to support SHA1 in FIT images within SPL. A SHA1
210 checksum is a 160-bit (20-byte) hash value used to check that the
211 image contents have not been corrupted or maliciously altered.
212 While SHA1 is fairly secure it is coming to the end of its life
213 due to the expanding computing power avaiable to brute-force
214 attacks. For more security, consider SHA256.
216 config SPL_SHA256_SUPPORT
217 bool "Support SHA256"
221 Enable this to support SHA256 in FIT images within SPL. A SHA256
222 checksum is a 256-bit (32-byte) hash value used to check that the
223 image contents have not been corrupted. SHA256 is recommended for
224 use in secure applications since (as at 2016) there is no known
225 feasible attack that could produce a 'collision' with differing
226 input data. Use this for the highest security. Note that only the
227 SHA256 variant is supported: SHA512 and others are not currently
230 config SPL_CPU_SUPPORT
231 bool "Support CPU drivers"
233 Enable this to support CPU drivers in SPL. These drivers can set
234 up CPUs and provide information about them such as the model and
235 name. This can be useful in SPL since setting up the CPUs earlier
236 may improve boot performance. Enable this option to build the
237 drivers in drivers/cpu as part of an SPL build.
239 config SPL_CRYPTO_SUPPORT
240 bool "Support crypto drivers"
242 Enable crypto drivers in SPL. These drivers can be used to
243 accelerate secure boot processing in secure applications. Enable
244 this option to build the drivers in drivers/crypto as part of an
247 config SPL_HASH_SUPPORT
248 bool "Support hashing drivers"
252 Enable hashing drivers in SPL. These drivers can be used to
253 accelerate secure boot processing in secure applications. Enable
254 this option to build system-specific drivers for hash acceleration
255 as part of an SPL build.
257 config SPL_DMA_SUPPORT
258 bool "Support DMA drivers"
260 Enable DMA (direct-memory-access) drivers in SPL. These drivers
261 can be used to handle memory-to-peripheral data transfer without
262 the CPU moving the data. Enable this option to build the drivers
263 in drivers/dma as part of an SPL build.
265 config SPL_DRIVERS_MISC_SUPPORT
266 bool "Support misc drivers"
268 Enable miscellaneous drivers in SPL. These drivers perform various
269 tasks that don't fall nicely into other categories, Enable this
270 option to build the drivers in drivers/misc as part of an SPL
271 build, for those that support building in SPL (not all drivers do).
273 config SPL_ENV_SUPPORT
274 bool "Support an environment"
276 Enable environment support in SPL. The U-Boot environment provides
277 a number of settings (essentially name/value pairs) which can
278 control many aspects of U-Boot's operation. Normally this is not
279 needed in SPL as it has a much simpler task with less
280 configuration. But some boards use this to support 'Falcon' boot
281 on EXT2 and FAT, where SPL boots directly into Linux without
282 starting U-Boot first. Enabling this option will make env_get()
283 and env_set() available in SPL.
286 bool "Support save environment"
287 depends on SPL_ENV_SUPPORT
289 Enable save environment support in SPL after setenv. By default
290 the saveenv option is not provided in SPL, but some boards need
291 this support in 'Falcon' boot, where SPL need to boot from
292 different images based on environment variable set by OS. For
293 example OS may set "reboot_image" environment variable to
294 "recovery" inorder to boot recovery image by SPL. The SPL read
295 "reboot_image" and act accordingly and change the reboot_image
296 to default mode using setenv and save the environemnt.
298 config SPL_ETH_SUPPORT
299 bool "Support Ethernet"
300 depends on SPL_ENV_SUPPORT
302 Enable access to the network subsystem and associated Ethernet
303 drivers in SPL. This permits SPL to load U-Boot over an Ethernet
304 link rather than from an on-board peripheral. Environment support
305 is required since the network stack uses a number of environment
306 variables. See also SPL_NET_SUPPORT.
308 config SPL_EXT_SUPPORT
309 bool "Support EXT filesystems"
311 Enable support for EXT2/3/4 filesystems with SPL. This permits
312 U-Boot (or Linux in Falcon mode) to be loaded from an EXT
313 filesystem from within SPL. Support for the underlying block
314 device (e.g. MMC or USB) must be enabled separately.
316 config SPL_FAT_SUPPORT
317 bool "Support FAT filesystems"
320 Enable support for FAT and VFAT filesystems with SPL. This
321 permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
322 filesystem from within SPL. Support for the underlying block
323 device (e.g. MMC or USB) must be enabled separately.
325 config SPL_FPGA_SUPPORT
328 Enable support for FPGAs in SPL. Field-programmable Gate Arrays
329 provide software-configurable hardware which is typically used to
330 implement peripherals (such as UARTs, LCD displays, MMC) or
331 accelerate custom processing functions, such as image processing
332 or machine learning. Sometimes it is useful to program the FPGA
333 as early as possible during boot, and this option can enable that
336 config SPL_GPIO_SUPPORT
339 Enable support for GPIOs (General-purpose Input/Output) in SPL.
340 GPIOs allow U-Boot to read the state of an input line (high or
341 low) and set the state of an output line. This can be used to
342 drive LEDs, control power to various system parts and read user
343 input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
344 for example. Enable this option to build the drivers in
345 drivers/gpio as part of an SPL build.
347 config SPL_I2C_SUPPORT
350 Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
351 I2C works with a clock and data line which can be driven by a
352 one or more masters or slaves. It is a fairly complex bus but is
353 widely used as it only needs two lines for communication. Speeds of
354 400kbps are typical but up to 3.4Mbps is supported by some
355 hardware. I2C can be useful in SPL to configure power management
356 ICs (PMICs) before raising the CPU clock speed, for example.
357 Enable this option to build the drivers in drivers/i2c as part of
360 config SPL_LIBCOMMON_SUPPORT
361 bool "Support common libraries"
363 Enable support for common U-Boot libraries within SPL. These
364 libraries include common code to deal with U-Boot images,
365 environment and USB, for example. This option is enabled on many
366 boards. Enable this option to build the code in common/ as part of
369 config SPL_LIBDISK_SUPPORT
370 bool "Support disk paritions"
372 Enable support for disk partitions within SPL. 'Disk' is something
373 of a misnomer as it includes non-spinning media such as flash (as
374 used in MMC and USB sticks). Partitions provide a way for a disk
375 to be split up into separate regions, with a partition table placed
376 at the start or end which describes the location and size of each
377 'partition'. These partitions are typically uses as individual block
378 devices, typically with an EXT2 or FAT filesystem in each. This
379 option enables whatever partition support has been enabled in
380 U-Boot to also be used in SPL. It brings in the code in disk/.
382 config SPL_LIBGENERIC_SUPPORT
383 bool "Support generic libraries"
385 Enable support for generic U-Boot libraries within SPL. These
386 libraries include generic code to deal with device tree, hashing,
387 printf(), compression and the like. This option is enabled on many
388 boards. Enable this option to build the code in lib/ as part of an
391 config SPL_MMC_SUPPORT
395 Enable support for MMC (Multimedia Card) within SPL. This enables
396 the MMC protocol implementation and allows any enabled drivers to
397 be used within SPL. MMC can be used with or without disk partition
398 support depending on the application (SPL_LIBDISK_SUPPORT). Enable
399 this option to build the drivers in drivers/mmc as part of an SPL
402 config SPL_MPC8XXX_INIT_DDR_SUPPORT
403 bool "Support MPC8XXX DDR init"
405 Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
406 random-access memory) on the MPC8XXX family within SPL. This
407 allows DRAM to be set up before loading U-Boot into that DRAM,
410 config SPL_MTD_SUPPORT
411 bool "Support MTD drivers"
413 Enable support for MTD (Memory Technology Device) within SPL. MTD
414 provides a block interface over raw NAND and can also be used with
415 SPI flash. This allows SPL to load U-Boot from supported MTD
416 devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
417 to enable specific MTD drivers.
419 config SPL_MUSB_NEW_SUPPORT
420 bool "Support new Mentor Graphics USB"
422 Enable support for Mentor Graphics USB in SPL. This is a new
423 driver used by some boards. Enable this option to build
424 the drivers in drivers/usb/musb-new as part of an SPL build. The
425 old drivers are in drivers/usb/musb.
427 config SPL_NAND_SUPPORT
428 bool "Support NAND flash"
430 Enable support for NAND (Negative AND) flash in SPL. NAND flash
431 can be used to allow SPL to load U-Boot from supported devices.
432 This enables the drivers in drivers/mtd/nand as part of an SPL
435 config SPL_NET_SUPPORT
436 bool "Support networking"
438 Enable support for network devices (such as Ethernet) in SPL.
439 This permits SPL to load U-Boot over a network link rather than
440 from an on-board peripheral. Environment support is required since
441 the network stack uses a number of environment variables. See also
445 config SPL_NET_VCI_STRING
446 string "BOOTP Vendor Class Identifier string sent by SPL"
448 As defined by RFC 2132 the vendor class identifier field can be
449 sent by the client to identify the vendor type and configuration
450 of a client. This is often used in practice to allow for the DHCP
451 server to specify different files to load depending on if the ROM,
452 SPL or U-Boot itself makes the request
453 endif # if SPL_NET_SUPPORT
455 config SPL_NO_CPU_SUPPORT
456 bool "Drop CPU code in SPL"
458 This is specific to the ARM926EJ-S CPU. It disables the standard
459 start.S start-up code, presumably so that a replacement can be
460 used on that CPU. You should not enable it unless you know what
463 config SPL_NOR_SUPPORT
464 bool "Support NOR flash"
466 Enable support for loading U-Boot from memory-mapped NOR (Negative
467 OR) flash in SPL. NOR flash is slow to write but fast to read, and
468 a memory-mapped device makes it very easy to access. Loading from
469 NOR is typically achieved with just a memcpy().
471 config SPL_XIP_SUPPORT
475 Enable support for execute in place of U-Boot or kernel image. There
476 is no need to copy image from flash to ram if flash supports execute
477 in place. Its very useful in systems having enough flash but not
478 enough ram to load the image.
480 config SPL_ONENAND_SUPPORT
481 bool "Support OneNAND flash"
483 Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
484 a type of NAND flash and therefore can be used to allow SPL to
485 load U-Boot from supported devices. This enables the drivers in
486 drivers/mtd/onenand as part of an SPL build.
489 bool "Activate Falcon Mode"
490 depends on !TI_SECURE_DEVICE
493 Enable booting directly to an OS from SPL.
494 for more info read doc/README.falcon
498 hex "addr, where OS is found"
499 depends on SPL_NOR_SUPPORT
501 Specify the address, where the OS image is found, which
506 config SPL_PCI_SUPPORT
507 bool "Support PCI drivers"
509 Enable support for PCI in SPL. For platforms that need PCI to boot,
510 or must perform some init using PCI in SPL, this provides the
511 necessary driver support. This enables the drivers in drivers/pci
512 as part of an SPL build.
514 config SPL_PCH_SUPPORT
515 bool "Support PCH drivers"
517 Enable support for PCH (Platform Controller Hub) devices in SPL.
518 These are used to set up GPIOs and the SPI peripheral early in
519 boot. This enables the drivers in drivers/pch as part of an SPL
522 config SPL_POST_MEM_SUPPORT
523 bool "Support POST drivers"
525 Enable support for POST (Power-on Self Test) in SPL. POST is a
526 procedure that checks that the hardware (CPU or board) appears to
527 be functionally correctly. It is a sanity check that can be
528 performed before booting. This enables the drivers in post/drivers
529 as part of an SPL build.
531 config SPL_POWER_SUPPORT
532 bool "Support power drivers"
534 Enable support for power control in SPL. This includes support
535 for PMICs (Power-management Integrated Circuits) and some of the
536 features provided by PMICs. In particular, voltage regulators can
537 be used to enable/disable power and vary its voltage. That can be
538 useful in SPL to turn on boot peripherals and adjust CPU voltage
539 so that the clock speed can be increased. This enables the drivers
540 in drivers/power, drivers/power/pmic and drivers/power/regulator
541 as part of an SPL build.
543 config SPL_RAM_SUPPORT
544 bool "Support booting from RAM"
545 default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
547 Enable booting of an image in RAM. The image can be preloaded or
548 it can be loaded by SPL directly into RAM (e.g. using USB).
550 config SPL_RAM_DEVICE
551 bool "Support booting from preloaded image in RAM"
552 depends on SPL_RAM_SUPPORT
553 default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
555 Enable booting of an image already loaded in RAM. The image has to
556 be already in memory when SPL takes over, e.g. loaded by the boot
559 config SPL_RTC_SUPPORT
560 bool "Support RTC drivers"
562 Enable RTC (Real-time Clock) support in SPL. This includes support
563 for reading and setting the time. Some RTC devices also have some
564 non-volatile (battery-backed) memory which is accessible if
565 needed. This enables the drivers in drivers/rtc as part of an SPL
568 config SPL_SATA_SUPPORT
569 bool "Support loading from SATA"
571 Enable support for SATA (Serial AT attachment) in SPL. This allows
572 use of SATA devices such as hard drives and flash drivers for
573 loading U-Boot. SATA is used in higher-end embedded systems and
574 can provide higher performance than MMC , at somewhat higher
575 expense and power consumption. This enables loading from SATA
576 using a configured device.
578 config SPL_SERIAL_SUPPORT
579 bool "Support serial"
581 Enable support for serial in SPL. This allows use of a serial UART
582 for displaying messages while SPL is running. It also brings in
583 printf() and panic() functions. This should normally be enabled
584 unless there are space reasons not to. Even then, consider
585 enabling USE_TINY_PRINTF which is a small printf() version.
587 config SPL_SPI_FLASH_SUPPORT
588 bool "Support SPI flash drivers"
590 Enable support for using SPI flash in SPL, and loading U-Boot from
591 SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
592 the SPI bus that is used to connect it to a system. It is a simple
593 but fast bidirectional 4-wire bus (clock, chip select and two data
594 lines). This enables the drivers in drivers/mtd/spi as part of an
595 SPL build. This normally requires SPL_SPI_SUPPORT.
597 config SPL_SPI_SUPPORT
598 bool "Support SPI drivers"
600 Enable support for using SPI in SPL. This is used for connecting
601 to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
602 more details on that. The SPI driver provides the transport for
603 data between the SPI flash and the CPU. This option can be used to
604 enable SPI drivers that are needed for other purposes also, such
607 config SPL_USB_HOST_SUPPORT
608 bool "Support USB host drivers"
610 Enable access to USB (Universal Serial Bus) host devices so that
611 SPL can load U-Boot from a connected USB peripheral, such as a USB
612 flash stick. While USB takes a little longer to start up than most
613 buses, it is very flexible since many different types of storage
614 device can be attached. This option enables the drivers in
615 drivers/usb/host as part of an SPL build.
617 config SPL_USB_SUPPORT
618 bool "Support loading from USB"
619 depends on SPL_USB_HOST_SUPPORT
621 Enable support for USB devices in SPL. This allows use of USB
622 devices such as hard drives and flash drivers for loading U-Boot.
623 The actual drivers are enabled separately using the normal U-Boot
624 config options. This enables loading from USB using a configured
627 config SPL_USB_GADGET_SUPPORT
628 bool "Suppport USB Gadget drivers"
630 Enable USB Gadget API which allows to enable USB device functions
633 if SPL_USB_GADGET_SUPPORT
635 config SPL_USBETH_SUPPORT
636 bool "Support USB Ethernet drivers"
638 Enable access to the USB network subsystem and associated
639 drivers in SPL. This permits SPL to load U-Boot over a
640 USB-connected Ethernet link (such as a USB Ethernet dongle) rather
641 than from an onboard peripheral. Environment support is required
642 since the network stack uses a number of environment variables.
643 See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
645 config SPL_DFU_SUPPORT
646 bool "Support DFU (Device Firmware Upgarde)"
647 select SPL_HASH_SUPPORT
648 select SPL_DFU_NO_RESET
649 depends on SPL_RAM_SUPPORT
651 This feature enables the DFU (Device Firmware Upgarde) in SPL with
652 RAM memory device support. The ROM code will load and execute
653 the SPL built with dfu. The user can load binaries (u-boot/kernel) to
654 selected device partition from host-pc using dfu-utils.
655 This feature is useful to flash the binaries to factory or bare-metal
656 boards using USB interface.
659 bool "DFU device selection"
660 depends on SPL_DFU_SUPPORT
664 depends on SPL_DFU_SUPPORT && SPL_RAM_SUPPORT
666 select RAM/DDR memory device for loading binary images
667 (u-boot/kernel) to the selected device partition using
668 DFU and execute the u-boot/kernel from RAM.
672 config SPL_USB_SDP_SUPPORT
673 bool "Support SDP (Serial Download Protocol)"
675 Enable Serial Download Protocol (SDP) device support in SPL. This
676 allows to download images into memory and execute (jump to) them
677 using the same protocol as implemented by the i.MX family's boot ROM.
680 config SPL_WATCHDOG_SUPPORT
681 bool "Support watchdog drivers"
683 Enable support for watchdog drivers in SPL. A watchdog is
684 typically a hardware peripheral which can reset the system when it
685 detects no activity for a while (such as a software crash). This
686 enables the drivers in drivers/watchdog as part of an SPL build.
688 config SPL_YMODEM_SUPPORT
689 bool "Support loading using Ymodem"
691 While loading from serial is slow it can be a useful backup when
692 there is no other option. The Ymodem protocol provides a reliable
693 means of transmitting U-Boot over a serial line for using in SPL,
694 with a checksum to ensure correctness.
696 config SPL_ATF_SUPPORT
697 bool "Support ARM Trusted Firmware"
700 ATF(ARM Trusted Firmware) is a component for ARM arch64 which
701 is loaded by SPL(which is considered as BL2 in ATF terminology).
702 More detail at: https://github.com/ARM-software/arm-trusted-firmware
704 config SPL_ATF_TEXT_BASE
705 depends on SPL_ATF_SUPPORT
706 hex "ATF BL31 base address"
708 This is the base address in memory for ATF BL31 text and entry point.
712 depends on SUPPORT_TPL
715 If you want to build TPL as well as the normal image and SPL, say Y.
720 string "Linker script for the TPL stage"
723 The TPL stage will usually require a different linker-script
724 (as it runs from a different memory region) than the regular
725 U-Boot stage. Set this to the path of the linker-script to
728 May be left empty to trigger the Makefile infrastructure to
729 fall back to the linker-script used for the SPL stage.
731 config TPL_NEEDS_SEPARATE_TEXT_BASE
732 bool "TPL needs a separate text-base"
736 Enable, if the TPL stage should not inherit its text-base
737 from the SPL stage. When enabled, a base address for the
738 .text sections of the TPL stage has to be set below.
740 config TPL_NEEDS_SEPARATE_STACK
741 bool "TPL needs a separate initial stack-pointer"
745 Enable, if the TPL stage should not inherit its initial
746 stack-pointer from the settings for the SPL stage.
749 hex "Base address for the .text section of the TPL stage"
750 depends on TPL_NEEDS_SEPARATE_TEXT_BASE
752 The base address for the .text section of the TPL stage.
755 int "Maximum size (in bytes) for the TPL stage"
759 The maximum size (in bytes) of the TPL stage.
762 hex "Address of the initial stack-pointer for the TPL stage"
763 depends on TPL_NEEDS_SEPARATE_STACK
765 The address of the initial stack-pointer for the TPL stage.
766 Usually this will be the (aligned) top-of-stack.
768 config TPL_BOOTROM_SUPPORT
769 bool "Support returning to the BOOTROM (from TPL)"
771 Some platforms (e.g. the Rockchip RK3368) provide support in their
772 ROM for loading the next boot-stage after performing basic setup
775 Enable this option, to return to the BOOTROM through the
776 BOOT_DEVICE_BOOTROM (or fall-through to the next boot device in the
777 boot device list, if not implemented for a given board)
779 config TPL_DRIVERS_MISC_SUPPORT
780 bool "Support misc drivers in TPL"
782 Enable miscellaneous drivers in TPL. These drivers perform various
783 tasks that don't fall nicely into other categories, Enable this
784 option to build the drivers in drivers/misc as part of an TPL
785 build, for those that support building in TPL (not all drivers do).
787 config TPL_ENV_SUPPORT
788 bool "Support an environment"
790 Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
792 config TPL_I2C_SUPPORT
795 Enable support for the I2C bus in TPL. See SPL_I2C_SUPPORT for
798 config TPL_LIBCOMMON_SUPPORT
799 bool "Support common libraries"
801 Enable support for common U-Boot libraries within TPL. See
802 SPL_LIBCOMMON_SUPPORT for details.
804 config TPL_LIBGENERIC_SUPPORT
805 bool "Support generic libraries"
807 Enable support for generic U-Boot libraries within TPL. See
808 SPL_LIBGENERIC_SUPPORT for details.
810 config TPL_MPC8XXX_INIT_DDR_SUPPORT
811 bool "Support MPC8XXX DDR init"
813 Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
814 SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
816 config TPL_MMC_SUPPORT
820 Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
822 config TPL_NAND_SUPPORT
823 bool "Support NAND flash"
825 Enable support for NAND in TPL. See SPL_NAND_SUPPORT for details.
827 config TPL_SERIAL_SUPPORT
828 bool "Support serial"
830 Enable support for serial in TPL. See SPL_SERIAL_SUPPORT for
833 config TPL_SPI_FLASH_SUPPORT
834 bool "Support SPI flash drivers"
836 Enable support for using SPI flash in TPL. See SPL_SPI_FLASH_SUPPORT
839 config TPL_SPI_SUPPORT
840 bool "Support SPI drivers"
842 Enable support for using SPI in TPL. See SPL_SPI_SUPPORT for