uboot常用命令总结

进入uboot页面后，输入？或help可以查看uboot相关命令

Hit any key to stop autoboot: 0

=> ?

? - alias for 'help'

base - print or set address offset

bdinfo - print Board Info structure

bootefi - Boots an EFI payload from memory

bootelf - Boot from an ELF image in memory

bootm - boot application image from memory

bootp - boot image via network using BOOTP/TFTP protocol

bootvx - Boot vxWorks from an ELF image

bootz - boot Linux zImage image from memory

cmp - memory compare

cp - memory copy

crc32 - checksum calculation

dhcp - boot image via network using DHCP/TFTP protocol

echo - echo args to console

env - environment handling commands

erase - erase FLASH memory

exit - exit script

ext2load- load binary file from a Ext2 filesystem

ext2ls - list files in a directory (default /)

ext4load- load binary file from a Ext4 filesystem

ext4ls - list files in a directory (default /)

ext4size- determine a file's size

false - do nothing, unsuccessfully

fatinfo - print information about filesystem

fatload - load binary file from a dos filesystem

fatls - list files in a directory (default /)

fatsize - determine a file's size

fdt - flattened device tree utility commands

flinfo - print FLASH memory information

fstype - Look up a filesystem type

go - start application at address 'addr'

help - print command description/usage

iminfo - print header information for application image

load - load binary file from a filesystem

loop - infinite loop on address range

ls - list files in a directory (default /)

md - memory display

mii - MII utility commands

mm - memory modify (auto-incrementing address)

mmc - MMC sub system

mmcinfo - display MMC info

mw - memory write (fill)

nm - memory modify (constant address)

part - disk partition related commands

ping - send ICMP ECHO_REQUEST to network host

printenv- print environment variables

protect - enable or disable FLASH write protection

pxe - commands to get and boot from pxe files

reset - Perform RESET of the CPU

run - run commands in an environment variable

save - save file to a filesystem

saveenv - save environment variables to persistent storage

setenv - set environment variables

showvar - print local hushshell variables

size - determine a file's size

source - run script from memory

sysboot - command to get and boot from syslinux files

test - minimal test like /bin/sh

tftpboot- boot image via network using TFTP protocol

true - do nothing, successfully

version - print monitor, compiler and linker version

=>

输入“help(或?) 命令名”可以查看命令的详细用法

=> ? bootz

bootz - boot Linux zImage image from memory

Usage:

bootz [addr [initrd[:size]] [fdt]]

- boot Linux zImage stored in memory

The argument 'initrd' is optional and specifies the address

of the initrd in memory. The optional argument ':size' allows

specifying the size of RAW initrd.

When booting a Linux kernel which requires a flat device-tree

a third argument is required which is the address of the

device-tree blob. To boot that kernel without an initrd image,

use a '-' for the second argument. If you do not pass a third

a bd_info struct will be passed instead

=>

下面介绍uboot的一些常用命令

reset

重启uboot

=> help reset

reset - Perform RESET of the CPU

Usage:

reset

=>

printenv

=> printenv

arch=arm

baudrate=38400

board=vexpress

board_name=vexpress

boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}

boot_efi_binary=load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootarm.efi; if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi

boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}extlinux/extlinux.conf

boot_prefixes=/ /boot/

boot_script_dhcp=boot.scr.uimg

boot_scripts=boot.scr.uimg boot.scr

boot_targets=mmc1 mmc0 pxe dhcp

bootcmd=run distro_bootcmd; run bootflash;

bootcmd_dhcp=if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00010:UNDI:003000;setenv bootp_arch 0xa;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;

bootcmd_mmc0=setenv devnum 0; run mmc_boot

bootcmd_mmc1=setenv devnum 1; run mmc_boot

bootcmd_pxe=dhcp; if pxe get; then pxe boot; fi

bootdelay=2

bootflash=run flashargs; cp ${ramdisk_addr} ${ramdisk_addr_r} ${maxramdisk}; bootm ${kernel_addr} ${ramdisk_addr_r}

console=ttyAMA0,38400n8

cpu=armv7

distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done

dram=1024M

efi_dtb_prefixes=/ /dtb/ /dtb/current/

ethact=smc911x-0

ethaddr=52:54:00:12:34:56

flashargs=setenv bootargs root=${root} console=${console} mem=${dram} mtdparts=${mtd} mmci.fmax=190000 devtmpfs.mount=0 vmalloc=256M

kernel_addr=0x44100000

kernel_addr_r=0x80008000

load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}

loadaddr=0x80008000

maxramdisk=0x1800000

mmc_boot=if mmc dev ${devnum}; then setenv devtype mmc; run scan_dev_for_boot_part; fi

mtd=armflash:1M@0x800000(uboot),7M@0x1000000(kernel),24M@0x2000000(initrd)

pxefile_addr_r=0x88000000

ramdisk_addr=0x44800000

ramdisk_addr_r=0x61000000

root=/dev/sda1 rw

scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;

scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run scan_dev_for_boot; fi; done

scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;if test -e ${devtype} ${devnum}:${distro_bootpart} efi/boot/bootarm.efi; then echo Found EFI removable media binary efi/boot/bootarm.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile

scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}extlinux/extlinux.conf; then echo Found ${prefix}extlinux/extlinux.conf; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi

scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done

scriptaddr=0x88000000

stderr=serial

stdin=serial

stdout=serial

vendor=armltd

Environment size: 3974/262140 bytes

=>

setenv

//设置/修改/删除环境变量的值

=> help setenv

setenv - set environment variables

Usage:

setenv [-f] name value ...

- [forcibly] set environment variable 'name' to 'value ...'

setenv [-f] name

- [forcibly] delete environment variable 'name'

=>

md

用于查看内存地址上的值

=> ? md

md - memory display

Usage:

md [.b, .w, .l] address [# of objects]

=>

mw

用于修改内存地址上的值

=> help mw

mw - memory write (fill)

Usage:

mw [.b, .w, .l] address value [count]

=>

执行指定内存地址上的指令

=> help go

go - start application at address 'addr'

Usage:

go addr [arg ...]

- start application at address 'addr'

passing 'arg' as arguments

=>

mmc

sd/mmc接口设备(sd卡, emmc)操作命令, 按扇区操作(每扇区512字节)

=> help mmc

mmc - MMC sub system

Usage:

mmc info - display info of the current MMC device

mmc read addr blk# cnt

mmc write addr blk# cnt

mmc erase blk# cnt

mmc rescan

mmc part - lists available partition on current mmc device

mmc dev [dev] [part] - show or set current mmc device [partition]

mmc list - lists available devices

mmc hwpartition [args...] - does hardware partitioning

arguments (sizes in 512-byte blocks):

[user [enh start cnt] [wrrel {on|off}]] - sets user data area attributes

[gp1|gp2|gp3|gp4 cnt [enh] [wrrel {on|off}]] - general purpose partition

[check|set|complete] - mode, complete set partitioning completed

WARNING: Partitioning is a write-once setting once it is set to complete.

Power cycling is required to initialize partitions after set to complete.

mmc setdsr - set DSR register value

=>

ext2load、ext4load、fatload

从文件系统分区中读出文件到指定的内存地址

=> help ext2load

ext2load - load binary file from a Ext2 filesystem

Usage:

ext2load [ [addr [filename [bytes [pos]]]]]

- load binary file 'filename' from 'dev' on 'interface'

to address 'addr' from ext2 filesystem.

=> help ext4load

ext4load - load binary file from a Ext4 filesystem

Usage:

ext4load [ [addr [filename [bytes [pos]]]]]

- load binary file 'filename' from 'dev' on 'interface'

to address 'addr' from ext4 filesystem

=> help fatload

fatload - load binary file from a dos filesystem

Usage:

fatload [ [ [ [bytes [pos]]]]]

- Load binary file 'filename' from 'dev' on 'interface'

to address 'addr' from dos filesystem.

'pos' gives the file position to start loading from.

If 'pos' is omitted, 0 is used. 'pos' requires 'bytes'.

'bytes' gives the size to load. If 'bytes' is 0 or omitted,

the load stops on end of file.

If either 'pos' or 'bytes' are not aligned to

ARCH_DMA_MINALIGN then a misaligned buffer warning will

be printed and performance will suffer for the load.

=>

ext2ls、ext4ls、fatls

查看存储设备的文件系统分区里的内容

=> help ext2ls

ext2ls - list files in a directory (default /)

Usage:

ext2ls [directory]

- list files from 'dev' on 'interface' in a 'directory'

=> help ext4ls

ext4ls - list files in a directory (default /)

Usage:

ext4ls [directory]

- list files from 'dev' on 'interface' in a 'directory'

=> help fatls

fatls - list files in a directory (default /)

Usage:

fatls [] [directory]

- list files from 'dev' on 'interface' in a 'directory'

=>

ext4size、fatsize

确定文件大小

=> help ext4size

ext4size - determine a file's size

Usage:

ext4size

- Find file 'filename' from 'dev' on 'interface'

and determine its size.

=> help fatsize

fatsize - determine a file's size

Usage:

fatsize

- Find file 'filename' from 'dev' on 'interface'

and determine its size.

=>

fatinfo

用于查询指定 MMC 设置指定分区的文件系统信息

=> help fatinfo

fatinfo - print information about filesystem

Usage:

fatinfo []

- print information about filesystem from 'dev' on 'interface'

=>

run

run 命令用于运行环境变量中定义的命令，比如可以通过“run bootcmd”来运行 bootcmd 中的启动命令，但是 run 命令最大的作用在于运行我们自定义的环境变量。

=> help run

run - run commands in an environment variable

Usage:

run var [...]

- run the commands in the environment variable(s) 'var'

=>

tftp

用于通过网络下载东西到 DRAM 中，tftp 命令使用的 TFTP 协议， 主机作为 TFTP 服务器。需要在 主机 上搭建 TFTP 服务器

=> help tftp

tftpboot - boot image via network using TFTP protocol

Usage:

tftpboot [loadAddress] [[hostIPaddr:]bootfilename]

=>