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Kconfig
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menu "Command line interface"
config CMDLINE
bool "Support U-Boot commands"
default y
help
Enable U-Boot's command-line functions. This provides a means
to enter commands into U-Boot for a wide variety of purposes. It
also allows scripts (containing commands) to be executed.
Various commands and command categorys can be indivdually enabled.
Depending on the number of commands enabled, this can add
substantially to the size of U-Boot.
config HUSH_PARSER
bool "Use hush shell"
depends on CMDLINE
help
This option enables the "hush" shell (from Busybox) as command line
interpreter, thus enabling powerful command line syntax like
if...then...else...fi conditionals or `&&' and '||'
constructs ("shell scripts").
If disabled, you get the old, much simpler behaviour with a somewhat
smaller memory footprint.
config SYS_PROMPT
string "Shell prompt"
default "=> "
help
This string is displayed in the command line to the left of the
cursor.
menu "Autoboot options"
config AUTOBOOT
bool "Autoboot"
default y
help
This enables the autoboot. See doc/README.autoboot for detail.
config AUTOBOOT_KEYED
bool "Stop autobooting via specific input key / string"
default n
help
This option enables stopping (aborting) of the automatic
boot feature only by issuing a specific input key or
string. If not enabled, any input key will abort the
U-Boot automatic booting process and bring the device
to the U-Boot prompt for user input.
config AUTOBOOT_PROMPT
string "Autoboot stop prompt"
depends on AUTOBOOT_KEYED
default "Autoboot in %d seconds\\n"
help
This string is displayed before the boot delay selected by
CONFIG_BOOTDELAY starts. If it is not defined there is no
output indicating that autoboot is in progress.
Note that this define is used as the (only) argument to a
printf() call, so it may contain '%' format specifications,
provided that it also includes, sepearated by commas exactly
like in a printf statement, the required arguments. It is
the responsibility of the user to select only such arguments
that are valid in the given context.
config AUTOBOOT_ENCRYPTION
bool "Enable encryption in autoboot stopping"
depends on AUTOBOOT_KEYED
default n
config AUTOBOOT_DELAY_STR
string "Delay autobooting via specific input key / string"
depends on AUTOBOOT_KEYED && !AUTOBOOT_ENCRYPTION
help
This option delays the automatic boot feature by issuing
a specific input key or string. If CONFIG_AUTOBOOT_DELAY_STR
or the environment variable "bootdelaykey" is specified
and this string is received from console input before
autoboot starts booting, U-Boot gives a command prompt. The
U-Boot prompt will time out if CONFIG_BOOT_RETRY_TIME is
used, otherwise it never times out.
config AUTOBOOT_STOP_STR
string "Stop autobooting via specific input key / string"
depends on AUTOBOOT_KEYED && !AUTOBOOT_ENCRYPTION
help
This option enables stopping (aborting) of the automatic
boot feature only by issuing a specific input key or
string. If CONFIG_AUTOBOOT_STOP_STR or the environment
variable "bootstopkey" is specified and this string is
received from console input before autoboot starts booting,
U-Boot gives a command prompt. The U-Boot prompt never
times out, even if CONFIG_BOOT_RETRY_TIME is used.
config AUTOBOOT_KEYED_CTRLC
bool "Enable Ctrl-C autoboot interruption"
depends on AUTOBOOT_KEYED && !AUTOBOOT_ENCRYPTION
default n
help
This option allows for the boot sequence to be interrupted
by ctrl-c, in addition to the "bootdelaykey" and "bootstopkey".
Setting this variable provides an escape sequence from the
limited "password" strings.
config AUTOBOOT_STOP_STR_SHA256
string "Stop autobooting via SHA256 encrypted password"
depends on AUTOBOOT_KEYED && AUTOBOOT_ENCRYPTION
help
This option adds the feature to only stop the autobooting,
and therefore boot into the U-Boot prompt, when the input
string / password matches a values that is encypted via
a SHA256 hash and saved in the environment.
endmenu
source "cmd/fastboot/Kconfig"
config BUILD_BIN2C
bool
comment "Commands"
menu "Info commands"
config CMD_BDI
bool "bdinfo"
default y
help
Print board info
config CMD_CONFIG
bool "config"
select BUILD_BIN2C
default SANDBOX
help
Print ".config" contents.
If this option is enabled, the ".config" file contents are embedded
in the U-Boot image and can be printed on the console by the "config"
command. This provides information of which options are enabled on
the running U-Boot.
config CMD_CONSOLE
bool "coninfo"
default y
help
Print console devices and information.
config CMD_CPU
bool "cpu"
help
Print information about available CPUs. This normally shows the
number of CPUs, type (e.g. manufacturer, architecture, product or
internal name) and clock frequency. Other information may be
available depending on the CPU driver.
config CMD_LICENSE
bool "license"
select BUILD_BIN2C
help
Print GPL license text
config CMD_REGINFO
bool "reginfo"
depends on PPC
help
Register dump
endmenu
menu "Boot commands"
config CMD_BOOTD
bool "bootd"
default y
help
Run the command stored in the environment "bootcmd", i.e.
"bootd" does the same thing as "run bootcmd".
config CMD_BOOTM
bool "bootm"
default y
help
Boot an application image from the memory.
config CMD_BOOTZ
bool "bootz"
help
Boot the Linux zImage
config CMD_BOOTI
bool "booti"
depends on ARM64
default y
help
Boot an AArch64 Linux Kernel image from memory.
config CMD_BOOTEFI
bool "bootefi"
depends on EFI_LOADER
default y
help
Boot an EFI image from memory.
config CMD_BOOTEFI_HELLO_COMPILE
bool "Compile a standard EFI hello world binary for testing"
depends on CMD_BOOTEFI && (ARM || X86)
default y
help
This compiles a standard EFI hello world application with U-Boot so
that it can be used with the test/py testing framework. This is useful
for testing that EFI is working at a basic level, and for bringing
up EFI support on a new architecture.
No additional space will be required in the resulting U-Boot binary
when this option is enabled.
config CMD_BOOTEFI_HELLO
bool "Allow booting a standard EFI hello world for testing"
depends on CMD_BOOTEFI_HELLO_COMPILE
help
This adds a standard EFI hello world application to U-Boot so that
it can be used with the 'bootefi hello' command. This is useful
for testing that EFI is working at a basic level, and for bringing
up EFI support on a new architecture.
config CMD_BOOTMENU
bool "bootmenu"
select MENU
help
Add an ANSI terminal boot menu command.
config CMD_DTIMG
bool "dtimg"
help
Android DTB/DTBO image manipulation commands. Read dtb/dtbo files from
image into RAM, dump image structure information, etc. Those dtb/dtbo
files should be merged in one dtb further, which needs to be passed to
the kernel, as part of a boot process.
config CMD_ELF
bool "bootelf, bootvx"
default y
help
Boot an ELF/vxWorks image from the memory.
config CMD_FDT
bool "Flattened Device Tree utility commands"
default y
depends on OF_LIBFDT
help
Do FDT related setup before booting into the Operating System.
config CMD_GO
bool "go"
default y
help
Start an application at a given address.
config CMD_RUN
bool "run"
default y
help
Run the command in the given environment variable.
config CMD_IMI
bool "iminfo"
default y
help
Print header information for application image.
config CMD_IMLS
bool "imls"
default y
help
List all images found in flash
config CMD_XIMG
bool "imxtract"
default y
help
Extract a part of a multi-image.
config CMD_POWEROFF
bool "poweroff"
help
Poweroff/Shutdown the system
config CMD_SPL
bool "spl export - Export boot information for Falcon boot"
depends on SPL
help
Falcon mode allows booting directly from SPL into an Operating
System such as Linux, thus skipping U-Boot proper. See
doc/README.falcon for full information about how to use this
command.
config CMD_SPL_NAND_OFS
hex "Offset of OS command line args for Falcon-mode NAND boot"
depends on CMD_SPL
default 0
help
This provides the offset of the command line arguments for Linux
when booting from NAND in Falcon mode. See doc/README.falcon
for full information about how to use this option (and also see
board/gateworks/gw_ventana/README for an example).
config CMD_SPL_WRITE_SIZE
hex "Size of argument area"
depends on CMD_SPL
default 0x2000
help
This provides the size of the command-line argument area in NAND
flash used by Falcon-mode boot. See the documentation until CMD_SPL
for detail.
config CMD_THOR_DOWNLOAD
bool "thor - TIZEN 'thor' download"
help
Implements the 'thor' download protocol. This is a way of
downloading a software update over USB from an attached host.
There is no documentation about this within the U-Boot source code
but you should be able to find something on the interwebs.
config CMD_ZBOOT
bool "zboot - x86 boot command"
help
With x86 machines it is common to boot a bzImage file which
contains both a kernel and a setup.bin file. The latter includes
configuration information from the dark ages which x86 boards still
need to pick things out of.
Consider using FIT in preference to this since it supports directly
booting both 32- and 64-bit kernels, as well as secure boot.
Documentation is available in doc/uImage.FIT/x86-fit-boot.txt
endmenu
menu "Environment commands"
config CMD_ASKENV
bool "ask for env variable"
help
Ask for environment variable
config CMD_EXPORTENV
bool "env export"
default y
help
Export environments.
config CMD_IMPORTENV
bool "env import"
default y
help
Import environments.
config CMD_EDITENV
bool "editenv"
default y
help
Edit environment variable.
config CMD_GREPENV
bool "search env"
help
Allow for searching environment variables
config CMD_SAVEENV
bool "saveenv"
default y
help
Save all environment variables into the compiled-in persistent
storage.
config CMD_ENV_EXISTS
bool "env exists"
default y
help
Check if a variable is defined in the environment for use in
shell scripting.
config CMD_ENV_CALLBACK
bool "env callbacks - print callbacks and their associated variables"
help
Some environment variable have callbacks defined by
U_BOOT_ENV_CALLBACK. These are called when the variable changes.
For example changing "baudrate" adjust the serial baud rate. This
command lists the currently defined callbacks.
config CMD_ENV_FLAGS
bool "env flags -print variables that have non-default flags"
help
Some environment variables have special flags that control their
behaviour. For example, serial# can only be written once and cannot
be deleted. This command shows the variables that have special
flags.
endmenu
menu "Memory commands"
config CMD_CRC32
bool "crc32"
select HASH
default y
help
Compute CRC32.
config CRC32_VERIFY
bool "crc32 -v"
depends on CMD_CRC32
help
Add -v option to verify data against a crc32 checksum.
config CMD_EEPROM
bool "eeprom - EEPROM subsystem"
help
(deprecated, needs conversion to driver model)
Provides commands to read and write EEPROM (Electrically Erasable
Programmable Read Only Memory) chips that are connected over an
I2C bus.
config CMD_EEPROM_LAYOUT
bool "Enable layout-aware eeprom commands"
depends on CMD_EEPROM
help
(deprecated, needs conversion to driver model)
When enabled, additional eeprom sub-commands become available.
eeprom print - prints the contents of the eeprom in a human-readable
way (eeprom layout fields, and data formatted to be fit for human
consumption).
eeprom update - allows user to update eeprom fields by specifying
the field name, and providing the new data in a human readable format
(same format as displayed by the eeprom print command).
Both commands can either auto detect the layout, or be told which
layout to use.
Feature API:
__weak int parse_layout_version(char *str)
- override to provide your own layout name parsing
__weak void __eeprom_layout_assign(struct eeprom_layout *layout,
int layout_version);
- override to setup the layout metadata based on the version
__weak int eeprom_layout_detect(unsigned char *data)
- override to provide your own algorithm for detecting layout
version
eeprom_field.c
- contains various printing and updating functions for common
types of eeprom fields. Can be used for defining
custom layouts.
config EEPROM_LAYOUT_HELP_STRING
string "Tells user what layout names are supported"
depends on CMD_EEPROM_LAYOUT
default "<not defined>"
help
Help printed with the LAYOUT VERSIONS part of the 'eeprom'
command's help.
config LOOPW
bool "loopw"
help
Infinite write loop on address range
config CMD_MD5SUM
bool "md5sum"
default n
select MD5
help
Compute MD5 checksum.
config MD5SUM_VERIFY
bool "md5sum -v"
default n
depends on CMD_MD5SUM
help
Add -v option to verify data against an MD5 checksum.
config CMD_MEMINFO
bool "meminfo"
help
Display memory information.
config CMD_MEMORY
bool "md, mm, nm, mw, cp, cmp, base, loop"
default y
help
Memory commands.
md - memory display
mm - memory modify (auto-incrementing address)
nm - memory modify (constant address)
mw - memory write (fill)
cp - memory copy
cmp - memory compare
base - print or set address offset
loop - initialize loop on address range
config CMD_MEMTEST
bool "memtest"
help
Simple RAM read/write test.
config CMD_MX_CYCLIC
bool "mdc, mwc"
help
mdc - memory display cyclic
mwc - memory write cyclic
config CMD_SHA1SUM
bool "sha1sum"
select SHA1
help
Compute SHA1 checksum.
config SHA1SUM_VERIFY
bool "sha1sum -v"
depends on CMD_SHA1SUM
help
Add -v option to verify data against a SHA1 checksum.
config CMD_STRINGS
bool "strings - display strings in memory"
help
This works similarly to the Unix 'strings' command except that it
works with a memory range. String of printable characters found
within the range are displayed. The minimum number of characters
for a sequence to be considered a string can be provided.
endmenu
menu "Compression commands"
config CMD_LZMADEC
bool "lzmadec"
default y if CMD_BOOTI
select LZMA
help
Support decompressing an LZMA (Lempel-Ziv-Markov chain algorithm)
image from memory.
config CMD_UNZIP
bool "unzip"
default y if CMD_BOOTI
help
Uncompress a zip-compressed memory region.
config CMD_ZIP
bool "zip"
help
Compress a memory region with zlib deflate method.
endmenu
menu "Device access commands"
config CMD_ARMFLASH
#depends on FLASH_CFI_DRIVER
bool "armflash"
help
ARM Ltd reference designs flash partition access
config CMD_CLK
bool "clk - Show clock frequencies"
help
(deprecated)
Shows clock frequences by calling a sock_clk_dump() hook function.
This is depreated in favour of using the CLK uclass and accessing
clock values from associated drivers. However currently no command
exists for this.
config CMD_DEMO
bool "demo - Demonstration commands for driver model"
depends on DM
help
Provides a 'demo' command which can be used to play around with
driver model. To use this properly you will need to enable one or
both of the demo devices (DM_DEMO_SHAPE and DM_DEMO_SIMPLE).
Otherwise you will always get an empty list of devices. The demo
devices are defined in the sandbox device tree, so the easiest
option is to use sandbox and pass the -d point to sandbox's
u-boot.dtb file.
config CMD_DFU
bool "dfu"
select USB_FUNCTION_DFU
help
Enables the command "dfu" which is used to have U-Boot create a DFU
class device via USB. This command requires that the "dfu_alt_info"
environment variable be set and define the alt settings to expose to
the host.
config CMD_DM
bool "dm - Access to driver model information"
depends on DM
default y
help
Provides access to driver model data structures and information,
such as a list of devices, list of uclasses and the state of each
device (e.g. activated). This is not required for operation, but
can be useful to see the state of driver model for debugging or
interest.
config CMD_FDC
bool "fdcboot - Boot from floppy device"
help
The 'fdtboot' command allows booting an image from a floppy disk.
config CMD_FLASH
bool "flinfo, erase, protect"
default y
help
NOR flash support.
flinfo - print FLASH memory information
erase - FLASH memory
protect - enable or disable FLASH write protection
config CMD_FPGA
bool "fpga"
default y
help
FPGA support.
config CMD_FPGA_LOADBP
bool "fpga loadbp - load partial bitstream (Xilinx only)"
depends on CMD_FPGA
help
Supports loading an FPGA device from a bitstream buffer containing
a partial bitstream.
config CMD_FPGA_LOADFS
bool "fpga loadfs - load bitstream from FAT filesystem (Xilinx only)"
depends on CMD_FPGA
help
Supports loading an FPGA device from a FAT filesystem.
config CMD_FPGA_LOADMK
bool "fpga loadmk - load bitstream from image"
depends on CMD_FPGA
help
Supports loading an FPGA device from a image generated by mkimage.
config CMD_FPGA_LOADP
bool "fpga loadp - load partial bitstream"
depends on CMD_FPGA
help
Supports loading an FPGA device from a bitstream buffer containing
a partial bitstream.
config CMD_FPGAD
bool "fpgad - dump FPGA registers"
help
(legacy, needs conversion to driver model)
Provides a way to dump FPGA registers by calling the board-specific
fpga_get_reg() function. This functions similarly to the 'md'
command.
config CMD_FUSE
bool "fuse - support for the fuse subssystem"
help
(deprecated - needs conversion to driver model)
This allows reading, sensing, programming or overriding fuses
which control the behaviour of the device. The command uses the
fuse_...() API.
config CMD_GPIO
bool "gpio"
help
GPIO support.
config CMD_GPT
bool "GPT (GUID Partition Table) command"
select PARTITION_UUIDS
select EFI_PARTITION
imply RANDOM_UUID
help
Enable the 'gpt' command to ready and write GPT style partition
tables.
config RANDOM_UUID
bool "GPT Random UUID generation"
help
Enable the generation of partitions with random UUIDs if none
are provided.
config CMD_GPT_RENAME
bool "GPT partition renaming commands"
depends on CMD_GPT
help
Enables the 'gpt' command to interchange names on two GPT
partitions via the 'gpt swap' command or to rename single
partitions via the 'rename' command.
config CMD_IDE
bool "ide - Support for IDE drivers"
select IDE
help
Provides an 'ide' command which allows accessing the IDE drive,
reseting the IDE interface, printing the partition table and
geting device info. It also enables the 'diskboot' command which
permits booting from an IDE drive.
config CMD_IO
bool "io - Support for performing I/O accesses"
help
Provides an 'iod' command to display I/O space and an 'iow' command
to write values to the I/O space. This can be useful for manually
checking the state of devices during boot when debugging device
drivers, etc.
config CMD_IOTRACE
bool "iotrace - Support for tracing I/O activity"
help
Provides an 'iotrace' command which supports recording I/O reads and
writes in a trace buffer in memory . It also maintains a checksum
of the trace records (even if space is exhausted) so that the
sequence of I/O accesses can be verified.
When debugging drivers it is useful to see what I/O accesses were
done and in what order.
Even if the individual accesses are of little interest it can be
useful to verify that the access pattern is consistent each time
an operation is performed. In this case a checksum can be used to
characterise the operation of a driver. The checksum can be compared
across different runs of the operation to verify that the driver is
working properly.
In particular, when performing major refactoring of the driver, where
the access pattern should not change, the checksum provides assurance
that the refactoring work has not broken the driver.
This works by sneaking into the io.h heder for an architecture and
redirecting I/O accesses through iotrace's tracing mechanism.
For now no commands are provided to examine the trace buffer. The
format is fairly simple, so 'md' is a reasonable substitute.
Note: The checksum feature is only useful for I/O regions where the
contents do not change outside of software control. Where this is not
suitable you can fall back to manually comparing the addresses. It
might be useful to enhance tracing to only checksum the accesses and
not the data read/written.
config CMD_I2C
bool "i2c"
help
I2C support.
config CMD_LOADB
bool "loadb"
default y
help
Load a binary file over serial line.
config CMD_LOADS
bool "loads"
default y
help
Load an S-Record file over serial line
config CMD_LOAD_ANDROID
bool "load_android"
default n
depends on ANDROID_BOOT_IMAGE
help
Load an Android Boot image from storage. The Android Boot images
define the size and kernel address on the header, which are used by
this command.
config CMD_BOOT_ANDROID
bool "boot_android"
default n
depends on ANDROID_BOOTLOADER
help
Performs the Android Bootloader boot flow, loading the appropriate
Android image (normal kernel, recovery kernel or "bootloader" mode)
and booting it. The boot mode is determined by the contents of the
Android Bootloader Message.
config CMD_ANDROID_AB_SELECT
bool "android_ab_select"
default n
depends on ANDROID_AB
help
On Android devices with more than one boot slot (multiple copies of
the kernel and system images) this provides a command to select which
slot should be used to boot from and register the boot attempt. This
is used by the new A/B update model where one slot is updated in the
background while running from the other slot.
config CMD_BOOT_ROCKCHIP
bool "boot_rockchip"
default n
depends on RKIMG_BOOTLOADER
help
Performs the Rockchip Bootloader boot flow, loading the appropriate
Rockchip image (normal kernel, boot, resource and revocery)
and booting it. The boot mode is determined by the contents of the
Rockchip bootloader helper.
config CMD_MMC
bool "mmc"
help
MMC memory mapped support.
config CMD_NAND
bool "nand"
default y if NAND_SUNXI
help
NAND support.
if CMD_NAND
config CMD_NAND_TRIMFFS
bool "nand write.trimffs"
default y if ARCH_SUNXI
help
Allows one to skip empty pages when flashing something on a NAND.
config CMD_NAND_LOCK_UNLOCK
bool "nand lock/unlock"
help
NAND locking support.
config CMD_NAND_TORTURE
bool "nand torture"
help
NAND torture support.
endif # CMD_NAND
config CMD_NVME
bool "nvme"
depends on NVME
default y if NVME
help
NVM Express device support
config CMD_MMC_SPI
bool "mmc_spi - Set up MMC SPI device"
help
Provides a way to set up an MMC (Multimedia Card) SPI (Serial
Peripheral Interface) device. The device provides a means of
accessing an MMC device via SPI using a single data line, limited
to 20MHz. It is useful since it reduces the amount of protocol code
required.
config CMD_ONENAND
bool "onenand - access to onenand device"
help
OneNAND is a brand of NAND ('Not AND' gate) flash which provides
various useful features. This command allows reading, writing,
and erasing blocks. It allso provides a way to show and change
bad blocks, and test the device.
config CMD_PART
bool "part"
select PARTITION_UUIDS
help
Read and display information about the partition table on
various media.
config CMD_PCI
bool "pci - Access PCI devices"
help
Provide access to PCI (Peripheral Interconnect Bus), a type of bus
used on some devices to allow the CPU to communicate with its
peripherals. Sub-commands allow bus enumeration, displaying and
changing configuration space and a few other features.
config CMD_PCMCIA
bool "pinit - Set up PCMCIA device"
help
Provides a means to initialise a PCMCIA (Personal Computer Memory
Card International Association) device. This is an old standard from
about 1990. These devices are typically removable memory or network
cards using a standard 68-pin connector.
config CMD_READ
bool "read - Read binary data from a partition"
help
Provides low-level access to the data in a partition.
config CMD_REMOTEPROC
bool "remoteproc"
depends on REMOTEPROC
help
Support for Remote Processor control
config CMD_ROCKUSB
bool "rockusb - Command to upgrade Rockchip device"
depends on USB_GADGET
help
Rockusb command provides a way to upgrade firmware for
Rockchip SoC based devices, its design make use of USB
Bulk-Only Transport based on UMS framework.
config CMD_RKNAND
bool "rknand"
depends on (RKNAND || RKNANDC_NAND)
default y if (RKNAND || RKNANDC_NAND)
help
Rockchip NAND FLASH device support
config CMD_RKSFC
bool "rksfc"
depends on (RKSFC_NOR || RKSFC_NAND)
default y if (RKSFC_NOR || RKSFC_NAND)
help
Rockchip SFC device support
config CMD_SATA
bool "sata - Access SATA subsystem"
select SATA
help
SATA (Serial Advanced Technology Attachment) is a serial bus
standard for connecting to hard drives and other storage devices.
This command provides information about attached devices and allows
reading, writing and other operations.
SATA replaces PATA (originally just ATA), which stands for Parallel AT
Attachment, where AT refers to an IBM AT (Advanced Technology)
computer released in 1984.
config CMD_SAVES
bool "saves - Save a file over serial in S-Record format"
help
Provides a way to save a binary file using the Motorola S-Record
format over the serial line.
config CMD_SDRAM
bool "sdram - Print SDRAM configuration information"
help
Provides information about attached SDRAM. This assumed that the
SDRAM has an EEPROM with information that can be read using the
I2C bus. This is only available on some boards.
config CMD_SF
bool "sf"
help
SPI Flash support
config CMD_SF_TEST
bool "sf test - Allow testing of SPI flash"
help
Provides a way to test that SPI flash is working correctly. The
test is destructive, in that an area of SPI flash must be provided
for the test to use. Performance information is also provided,
measuring the performance of reading, writing and erasing in
Mbps (Million Bits Per Second). This value should approximately
equal the SPI bus speed for a single-bit-wide SPI bus, assuming
everything is working properly.
config CMD_SPI
bool "sspi"
help
SPI utility command.
config CMD_TSI148
bool "tsi148 - Command to access tsi148 device"
help
This provides various sub-commands to initialise and configure the
Turndra tsi148 device. See the command help for full details.
config CMD_UNIVERSE
bool "universe - Command to set up the Turndra Universe controller"
help
This allows setting up the VMEbus provided by this controller.
See the command help for full details.
config CMD_USB
bool "usb"
help
USB support.
config CMD_USB_SDP
bool "sdp"
select USB_FUNCTION_SDP
help
Enables the command "sdp" which is used to have U-Boot emulating the
Serial Download Protocol (SDP) via USB.
config CMD_USB_MASS_STORAGE
bool "UMS usb mass storage"
help
USB mass storage support
endmenu
menu "Shell scripting commands"
config CMD_ECHO
bool "echo"
default y
help