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u-boot/common/Kconfig.boot
Simon Glass 7b6baa3314 Kconfig: Move boot media under boot options 
This relates to booting, so move it under the boot menu.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-10-09 11:59:50 -04:00

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menu "Boot options"
menu "Boot images"
config ANDROID_BOOT_IMAGE
bool "Enable support for Android Boot Images"
default y if FASTBOOT
help
This enables support for booting images which use the Android
image format header.
config FIT
bool "Support Flattened Image Tree"
select MD5
select SHA1
help
This option allows you to boot the new uImage structure,
Flattened Image Tree. FIT is formally a FDT, which can include
images of various types (kernel, FDT blob, ramdisk, etc.)
in a single blob. To boot this new uImage structure,
pass the address of the blob to the "bootm" command.
FIT is very flexible, supporting compression, multiple images,
multiple configurations, verification through hashing and also
verified boot (secure boot using RSA).
if FIT
config FIT_EXTERNAL_OFFSET
hex "FIT external data offset"
default 0x0
help
This specifies a data offset in fit image.
The offset is from data payload offset to the beginning of
fit image header. When specifies a offset, specific data
could be put in the hole between data payload and fit image
header, such as CSF data on i.MX platform.
config FIT_ENABLE_SHA256_SUPPORT
bool "Support SHA256 checksum of FIT image contents"
default y
select SHA256
help
Enable this to support SHA256 checksum of FIT image contents. A
SHA256 checksum is a 256-bit (32-byte) hash value used to check that
the image contents have not been corrupted.
config FIT_ENABLE_SHA384_SUPPORT
bool "Support SHA384 checksum of FIT image contents"
default n
select SHA384
help
Enable this to support SHA384 checksum of FIT image contents. A
SHA384 checksum is a 384-bit (48-byte) hash value used to check that
the image contents have not been corrupted. Use this for the highest
security.
config FIT_ENABLE_SHA512_SUPPORT
bool "Support SHA512 checksum of FIT image contents"
default n
select SHA512
help
Enable this to support SHA512 checksum of FIT image contents. A
SHA512 checksum is a 512-bit (64-byte) hash value used to check that
the image contents have not been corrupted.
config FIT_SIGNATURE
bool "Enable signature verification of FIT uImages"
depends on DM
select HASH
select RSA
select RSA_VERIFY
select IMAGE_SIGN_INFO
help
This option enables signature verification of FIT uImages,
using a hash signed and verified using RSA. If
CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
hashing is available using hardware, then the RSA library will use
it. See doc/uImage.FIT/signature.txt for more details.
WARNING: When relying on signed FIT images with a required signature
check the legacy image format is disabled by default, so that
unsigned images cannot be loaded. If a board needs the legacy image
format support in this case, enable it using
CONFIG_LEGACY_IMAGE_FORMAT.
config FIT_SIGNATURE_MAX_SIZE
hex "Max size of signed FIT structures"
depends on FIT_SIGNATURE
default 0x10000000
help
This option sets a max size in bytes for verified FIT uImages.
A sane value of 256MB protects corrupted DTB structures from overlapping
device memory. Assure this size does not extend past expected storage
space.
config FIT_ENABLE_RSASSA_PSS_SUPPORT
bool "Support rsassa-pss signature scheme of FIT image contents"
depends on FIT_SIGNATURE
default n
help
Enable this to support the pss padding algorithm as described
in the rfc8017 (https://tools.ietf.org/html/rfc8017).
config FIT_CIPHER
bool "Enable ciphering data in a FIT uImages"
depends on DM
select AES
help
Enable the feature of data ciphering/unciphering in the tool mkimage
and in the u-boot support of the FIT image.
config FIT_VERBOSE
bool "Show verbose messages when FIT images fail"
help
Generally a system will have valid FIT images so debug messages
are a waste of code space. If you are debugging your images then
you can enable this option to get more verbose information about
failures.
config FIT_BEST_MATCH
bool "Select the best match for the kernel device tree"
help
When no configuration is explicitly selected, default to the
one whose fdt's compatibility field best matches that of
U-Boot itself. A match is considered "best" if it matches the
most specific compatibility entry of U-Boot's fdt's root node.
The order of entries in the configuration's fdt is ignored.
config FIT_IMAGE_POST_PROCESS
bool "Enable post-processing of FIT artifacts after loading by U-Boot"
depends on TI_SECURE_DEVICE
help
Allows doing any sort of manipulation to blobs after they got extracted
from FIT images like stripping off headers or modifying the size of the
blob, verification, authentication, decryption etc. in a platform or
board specific way. In order to use this feature a platform or board-
specific implementation of board_fit_image_post_process() must be
provided. Also, anything done during this post-processing step would
need to be comprehended in how the images were prepared before being
injected into the FIT creation (i.e. the blobs would have been pre-
processed before being added to the FIT image).
if SPL
config SPL_FIT
bool "Support Flattened Image Tree within SPL"
depends on SPL
select SPL_OF_LIBFDT
config SPL_FIT_PRINT
bool "Support FIT printing within SPL"
depends on SPL_FIT
help
Support printing the content of the fitImage in a verbose manner in SPL.
config SPL_FIT_SIGNATURE
bool "Enable signature verification of FIT firmware within SPL"
depends on SPL_DM
select SPL_FIT
select SPL_CRYPTO_SUPPORT
select SPL_HASH_SUPPORT
select SPL_RSA
select SPL_RSA_VERIFY
select SPL_IMAGE_SIGN_INFO
config SPL_LOAD_FIT
bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
select SPL_FIT
help
Normally with the SPL framework a legacy image is generated as part
of the build. This contains U-Boot along with information as to
where it should be loaded. This option instead enables generation
of a FIT (Flat Image Tree) which provides more flexibility. In
particular it can handle selecting from multiple device tree
and passing the correct one to U-Boot.
config SPL_LOAD_FIT_ADDRESS
hex "load address of fit image"
depends on SPL_LOAD_FIT
default 0x0
help
Specify the load address of the fit image that will be loaded
by SPL.
config SPL_LOAD_FIT_APPLY_OVERLAY
bool "Enable SPL applying DT overlays from FIT"
depends on SPL_LOAD_FIT
select OF_LIBFDT_OVERLAY
help
The device tree is loaded from the FIT image. Allow the SPL is to
also load device-tree overlays from the FIT image an apply them
over the device tree.
config SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
depends on SPL_LOAD_FIT_APPLY_OVERLAY
default 0x10000
hex "size of temporary buffer used to load the overlays"
help
The size of the area where the overlays will be loaded and
uncompress. Must be at least as large as biggest overlay
(uncompressed)
config SPL_LOAD_FIT_FULL
bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
select SPL_FIT
help
Normally with the SPL framework a legacy image is generated as part
of the build. This contains U-Boot along with information as to
where it should be loaded. This option instead enables generation
of a FIT (Flat Image Tree) which provides more flexibility. In
particular it can handle selecting from multiple device tree
and passing the correct one to U-Boot.
config SPL_FIT_IMAGE_POST_PROCESS
bool "Enable post-processing of FIT artifacts after loading by the SPL"
depends on SPL_LOAD_FIT
help
Allows doing any sort of manipulation to blobs after they got extracted
from the U-Boot FIT image like stripping off headers or modifying the
size of the blob, verification, authentication, decryption etc. in a
platform or board specific way. In order to use this feature a platform
or board-specific implementation of board_fit_image_post_process() must
be provided. Also, anything done during this post-processing step would
need to be comprehended in how the images were prepared before being
injected into the FIT creation (i.e. the blobs would have been pre-
processed before being added to the FIT image).
config SPL_FIT_SOURCE
string ".its source file for U-Boot FIT image"
depends on SPL_FIT
help
Specifies a (platform specific) FIT source file to generate the
U-Boot FIT image. This could specify further image to load and/or
execute.
config USE_SPL_FIT_GENERATOR
bool "Use a script to generate the .its script"
default y if SPL_FIT && !ARCH_SUNXI
config SPL_FIT_GENERATOR
string ".its file generator script for U-Boot FIT image"
depends on USE_SPL_FIT_GENERATOR
default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
default "arch/arm/mach-zynqmp/mkimage_fit_atf.sh" if SPL_LOAD_FIT && ARCH_ZYNQMP
default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
help
Specifies a (platform specific) script file to generate the FIT
source file used to build the U-Boot FIT image file. This gets
passed a list of supported device tree file stub names to
include in the generated image.
endif # SPL
endif # FIT
config LEGACY_IMAGE_FORMAT
bool "Enable support for the legacy image format"
default y if !FIT_SIGNATURE
help
This option enables the legacy image format. It is enabled by
default for backward compatibility, unless FIT_SIGNATURE is
set where it is disabled so that unsigned images cannot be
loaded. If a board needs the legacy image format support in this
case, enable it here.
config OF_BOARD_SETUP
bool "Set up board-specific details in device tree before boot"
depends on OF_LIBFDT
help
This causes U-Boot to call ft_board_setup() before booting into
the Operating System. This function can set up various
board-specific information in the device tree for use by the OS.
The device tree is then passed to the OS.
config OF_SYSTEM_SETUP
bool "Set up system-specific details in device tree before boot"
depends on OF_LIBFDT
help
This causes U-Boot to call ft_system_setup() before booting into
the Operating System. This function can set up various
system-specific information in the device tree for use by the OS.
The device tree is then passed to the OS.
config OF_STDOUT_VIA_ALIAS
bool "Update the device-tree stdout alias from U-Boot"
depends on OF_LIBFDT
help
This uses U-Boot's serial alias from the aliases node to update
the device tree passed to the OS. The "linux,stdout-path" property
in the chosen node is set to point to the correct serial node.
This option currently references CONFIG_CONS_INDEX, which is
incorrect when used with device tree as this option does not
exist / should not be used.
config SYS_EXTRA_OPTIONS
string "Extra Options (DEPRECATED)"
help
The old configuration infrastructure (= mkconfig + boards.cfg)
provided the extra options field. If you have something like
"HAS_BAR,BAZ=64", the optional options
#define CONFIG_HAS
#define CONFIG_BAZ 64
will be defined in include/config.h.
This option was prepared for the smooth migration from the old
configuration to Kconfig. Since this option will be removed sometime,
new boards should not use this option.
config HAVE_SYS_TEXT_BASE
bool
depends on !NIOS2 && !XTENSA
depends on !EFI_APP
default y
config SYS_TEXT_BASE
depends on HAVE_SYS_TEXT_BASE
default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
hex "Text Base"
help
The address in memory that U-Boot will be running from, initially.
config SYS_CLK_FREQ
depends on ARC || ARCH_SUNXI || MPC83xx
int "CPU clock frequency"
help
TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
config ARCH_FIXUP_FDT_MEMORY
bool "Enable arch_fixup_memory_banks() call"
default y
help
Enable FDT memory map syncup before OS boot. This feature can be
used for booting OS with different memory setup where the part of
the memory location should be used for different purpose.
endmenu # Boot images
menu "Boot timing"
config BOOTSTAGE
bool "Boot timing and reporting"
help
Enable recording of boot time while booting. To use it, insert
calls to bootstage_mark() with a suitable BOOTSTAGE_ID from
bootstage.h. Only a single entry is recorded for each ID. You can
give the entry a name with bootstage_mark_name(). You can also
record elapsed time in a particular stage using bootstage_start()
before starting and bootstage_accum() when finished. Bootstage will
add up all the accumulated time and report it.
Normally, IDs are defined in bootstage.h but a small number of
additional 'user' IDs can be used by passing BOOTSTAGE_ID_ALLOC
as the ID.
Calls to show_boot_progress() will also result in log entries but
these will not have names.
config SPL_BOOTSTAGE
bool "Boot timing and reported in SPL"
depends on BOOTSTAGE
help
Enable recording of boot time in SPL. To make this visible to U-Boot
proper, enable BOOTSTAGE_STASH as well. This will stash the timing
information when SPL finishes and load it when U-Boot proper starts
up.
config TPL_BOOTSTAGE
bool "Boot timing and reported in TPL"
depends on BOOTSTAGE
help
Enable recording of boot time in SPL. To make this visible to U-Boot
proper, enable BOOTSTAGE_STASH as well. This will stash the timing
information when TPL finishes and load it when U-Boot proper starts
up.
config BOOTSTAGE_REPORT
bool "Display a detailed boot timing report before booting the OS"
depends on BOOTSTAGE
help
Enable output of a boot time report just before the OS is booted.
This shows how long it took U-Boot to go through each stage of the
boot process. The report looks something like this:
Timer summary in microseconds:
Mark Elapsed Stage
0 0 reset
3,575,678 3,575,678 board_init_f start
3,575,695 17 arch_cpu_init A9
3,575,777 82 arch_cpu_init done
3,659,598 83,821 board_init_r start
3,910,375 250,777 main_loop
29,916,167 26,005,792 bootm_start
30,361,327 445,160 start_kernel
config BOOTSTAGE_RECORD_COUNT
int "Number of boot stage records to store"
default 30
help
This is the size of the bootstage record list and is the maximum
number of bootstage records that can be recorded.
config SPL_BOOTSTAGE_RECORD_COUNT
int "Number of boot stage records to store for SPL"
default 5
help
This is the size of the bootstage record list and is the maximum
number of bootstage records that can be recorded.
config TPL_BOOTSTAGE_RECORD_COUNT
int "Number of boot stage records to store for TPL"
default 5
help
This is the size of the bootstage record list and is the maximum
number of bootstage records that can be recorded.
config BOOTSTAGE_FDT
bool "Store boot timing information in the OS device tree"
depends on BOOTSTAGE
help
Stash the bootstage information in the FDT. A root 'bootstage'
node is created with each bootstage id as a child. Each child
has a 'name' property and either 'mark' containing the
mark time in microseconds, or 'accum' containing the
accumulated time for that bootstage id in microseconds.
For example:
bootstage {
154 {
name = "board_init_f";
mark = <3575678>;
};
170 {
name = "lcd";
accum = <33482>;
};
};
Code in the Linux kernel can find this in /proc/devicetree.
config BOOTSTAGE_STASH
bool "Stash the boot timing information in memory before booting OS"
depends on BOOTSTAGE
help
Some OSes do not support device tree. Bootstage can instead write
the boot timing information in a binary format at a given address.
This happens through a call to bootstage_stash(), typically in
the CPU's cleanup_before_linux() function. You can use the
'bootstage stash' and 'bootstage unstash' commands to do this on
the command line.
config BOOTSTAGE_STASH_ADDR
hex "Address to stash boot timing information"
default 0
help
Provide an address which will not be overwritten by the OS when it
starts, so that it can read this information when ready.
config BOOTSTAGE_STASH_SIZE
hex "Size of boot timing stash region"
default 0x1000
help
This should be large enough to hold the bootstage stash. A value of
4096 (4KiB) is normally plenty.
config SHOW_BOOT_PROGRESS
bool "Show boot progress in a board-specific manner"
help
Defining this option allows to add some board-specific code (calling
a user-provided function show_boot_progress(int) that enables you to
show the system's boot progress on some display (for example, some
LEDs) on your board. At the moment, the following checkpoints are
implemented:
Legacy uImage format:
Arg Where When
1 common/cmd_bootm.c before attempting to boot an image
-1 common/cmd_bootm.c Image header has bad magic number
2 common/cmd_bootm.c Image header has correct magic number
-2 common/cmd_bootm.c Image header has bad checksum
3 common/cmd_bootm.c Image header has correct checksum
-3 common/cmd_bootm.c Image data has bad checksum
4 common/cmd_bootm.c Image data has correct checksum
-4 common/cmd_bootm.c Image is for unsupported architecture
5 common/cmd_bootm.c Architecture check OK
-5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
6 common/cmd_bootm.c Image Type check OK
-6 common/cmd_bootm.c gunzip uncompression error
-7 common/cmd_bootm.c Unimplemented compression type
7 common/cmd_bootm.c Uncompression OK
8 common/cmd_bootm.c No uncompress/copy overwrite error
-9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
9 common/image.c Start initial ramdisk verification
-10 common/image.c Ramdisk header has bad magic number
-11 common/image.c Ramdisk header has bad checksum
10 common/image.c Ramdisk header is OK
-12 common/image.c Ramdisk data has bad checksum
11 common/image.c Ramdisk data has correct checksum
12 common/image.c Ramdisk verification complete, start loading
-13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
13 common/image.c Start multifile image verification
14 common/image.c No initial ramdisk, no multifile, continue.
15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
-30 arch/powerpc/lib/board.c Fatal error, hang the system
-31 post/post.c POST test failed, detected by post_output_backlog()
-32 post/post.c POST test failed, detected by post_run_single()
34 common/cmd_doc.c before loading a Image from a DOC device
-35 common/cmd_doc.c Bad usage of "doc" command
35 common/cmd_doc.c correct usage of "doc" command
-36 common/cmd_doc.c No boot device
36 common/cmd_doc.c correct boot device
-37 common/cmd_doc.c Unknown Chip ID on boot device
37 common/cmd_doc.c correct chip ID found, device available
-38 common/cmd_doc.c Read Error on boot device
38 common/cmd_doc.c reading Image header from DOC device OK
-39 common/cmd_doc.c Image header has bad magic number
39 common/cmd_doc.c Image header has correct magic number
-40 common/cmd_doc.c Error reading Image from DOC device
40 common/cmd_doc.c Image header has correct magic number
41 common/cmd_ide.c before loading a Image from a IDE device
-42 common/cmd_ide.c Bad usage of "ide" command
42 common/cmd_ide.c correct usage of "ide" command
-43 common/cmd_ide.c No boot device
43 common/cmd_ide.c boot device found
-44 common/cmd_ide.c Device not available
44 common/cmd_ide.c Device available
-45 common/cmd_ide.c wrong partition selected
45 common/cmd_ide.c partition selected
-46 common/cmd_ide.c Unknown partition table
46 common/cmd_ide.c valid partition table found
-47 common/cmd_ide.c Invalid partition type
47 common/cmd_ide.c correct partition type
-48 common/cmd_ide.c Error reading Image Header on boot device
48 common/cmd_ide.c reading Image Header from IDE device OK
-49 common/cmd_ide.c Image header has bad magic number
49 common/cmd_ide.c Image header has correct magic number
-50 common/cmd_ide.c Image header has bad checksum
50 common/cmd_ide.c Image header has correct checksum
-51 common/cmd_ide.c Error reading Image from IDE device
51 common/cmd_ide.c reading Image from IDE device OK
52 common/cmd_nand.c before loading a Image from a NAND device
-53 common/cmd_nand.c Bad usage of "nand" command
53 common/cmd_nand.c correct usage of "nand" command
-54 common/cmd_nand.c No boot device
54 common/cmd_nand.c boot device found
-55 common/cmd_nand.c Unknown Chip ID on boot device
55 common/cmd_nand.c correct chip ID found, device available
-56 common/cmd_nand.c Error reading Image Header on boot device
56 common/cmd_nand.c reading Image Header from NAND device OK
-57 common/cmd_nand.c Image header has bad magic number
57 common/cmd_nand.c Image header has correct magic number
-58 common/cmd_nand.c Error reading Image from NAND device
58 common/cmd_nand.c reading Image from NAND device OK
-60 common/env_common.c Environment has a bad CRC, using default
64 net/eth.c starting with Ethernet configuration.
-64 net/eth.c no Ethernet found.
65 net/eth.c Ethernet found.
-80 common/cmd_net.c usage wrong
80 common/cmd_net.c before calling net_loop()
-81 common/cmd_net.c some error in net_loop() occurred
81 common/cmd_net.c net_loop() back without error
-82 common/cmd_net.c size == 0 (File with size 0 loaded)
82 common/cmd_net.c trying automatic boot
83 common/cmd_net.c running "source" command
-83 common/cmd_net.c some error in automatic boot or "source" command
84 common/cmd_net.c end without errors
FIT uImage format:
Arg Where When
100 common/cmd_bootm.c Kernel FIT Image has correct format
-100 common/cmd_bootm.c Kernel FIT Image has incorrect format
101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
-101 common/cmd_bootm.c Can't get configuration for kernel subimage
102 common/cmd_bootm.c Kernel unit name specified
-103 common/cmd_bootm.c Can't get kernel subimage node offset
103 common/cmd_bootm.c Found configuration node
104 common/cmd_bootm.c Got kernel subimage node offset
-104 common/cmd_bootm.c Kernel subimage hash verification failed
105 common/cmd_bootm.c Kernel subimage hash verification OK
-105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
106 common/cmd_bootm.c Architecture check OK
-106 common/cmd_bootm.c Kernel subimage has wrong type
107 common/cmd_bootm.c Kernel subimage type OK
-107 common/cmd_bootm.c Can't get kernel subimage data/size
108 common/cmd_bootm.c Got kernel subimage data/size
-108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
-109 common/cmd_bootm.c Can't get kernel subimage type
-110 common/cmd_bootm.c Can't get kernel subimage comp
-111 common/cmd_bootm.c Can't get kernel subimage os
-112 common/cmd_bootm.c Can't get kernel subimage load address
-113 common/cmd_bootm.c Image uncompress/copy overwrite error
120 common/image.c Start initial ramdisk verification
-120 common/image.c Ramdisk FIT image has incorrect format
121 common/image.c Ramdisk FIT image has correct format
122 common/image.c No ramdisk subimage unit name, using configuration
-122 common/image.c Can't get configuration for ramdisk subimage
123 common/image.c Ramdisk unit name specified
-124 common/image.c Can't get ramdisk subimage node offset
125 common/image.c Got ramdisk subimage node offset
-125 common/image.c Ramdisk subimage hash verification failed
126 common/image.c Ramdisk subimage hash verification OK
-126 common/image.c Ramdisk subimage for unsupported architecture
127 common/image.c Architecture check OK
-127 common/image.c Can't get ramdisk subimage data/size
128 common/image.c Got ramdisk subimage data/size
129 common/image.c Can't get ramdisk load address
-129 common/image.c Got ramdisk load address
-130 common/cmd_doc.c Incorrect FIT image format
131 common/cmd_doc.c FIT image format OK
-140 common/cmd_ide.c Incorrect FIT image format
141 common/cmd_ide.c FIT image format OK
-150 common/cmd_nand.c Incorrect FIT image format
151 common/cmd_nand.c FIT image format OK
endmenu
menu "Boot media"
config NOR_BOOT
bool "Support for booting from NOR flash"
depends on NOR
help
Enabling this will make a U-Boot binary that is capable of being
booted via NOR. In this case we will enable certain pinmux early
as the ROM only partially sets up pinmux. We also default to using
NOR for environment.
config NAND_BOOT
bool "Support for booting from NAND flash"
default n
imply MTD_RAW_NAND
help
Enabling this will make a U-Boot binary that is capable of being
booted via NAND flash. This is not a must, some SoCs need this,
some not.
config ONENAND_BOOT
bool "Support for booting from ONENAND"
default n
imply MTD_RAW_NAND
help
Enabling this will make a U-Boot binary that is capable of being
booted via ONENAND. This is not a must, some SoCs need this,
some not.
config QSPI_BOOT
bool "Support for booting from QSPI flash"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via QSPI flash. This is not a must, some SoCs need this,
some not.
config SATA_BOOT
bool "Support for booting from SATA"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via SATA. This is not a must, some SoCs need this,
some not.
config SD_BOOT
bool "Support for booting from SD/EMMC"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via SD/EMMC. This is not a must, some SoCs need this,
some not.
config SPI_BOOT
bool "Support for booting from SPI flash"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via SPI flash. This is not a must, some SoCs need this,
some not.
endmenu
endmenu # Booting
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