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
重启uboot
=> help reset
reset - Perform RESET of the CPU
Usage:
reset
=>
=> 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
=>
//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'
=>
用于查看内存地址上的值
=> ? md
md - memory display
Usage:
md [.b, .w, .l] address [# of objects]
=>
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
=>
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 <value> - set DSR register value
=>
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 <interface> [<dev[:part]> [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 <interface> [<dev[:part]> [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 <interface> [<dev[:part]> [<addr> [<filename> [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.
=>
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 <interface> <dev[:part]> [directory]
- list files from 'dev' on 'interface' in a 'directory'
=> help ext4ls
ext4ls - list files in a directory (default /)
Usage:
ext4ls <interface> <dev[:part]> [directory]
- list files from 'dev' on 'interface' in a 'directory'
=> help fatls
fatls - list files in a directory (default /)
Usage:
fatls <interface> [<dev[:part]>] [directory]
- list files from 'dev' on 'interface' in a 'directory'
=>
确定文件大小
=> help ext4size
ext4size - determine a file's size
Usage:
ext4size <interface> <dev[:part]> <filename>
- Find file 'filename' from 'dev' on 'interface'
and determine its size.
=> help fatsize
fatsize - determine a file's size
Usage:
fatsize <interface> <dev[:part]> <filename>
- Find file 'filename' from 'dev' on 'interface'
and determine its size.
=>
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 <interface> [<dev[:part]>]
- print information about filesystem from 'dev' on 'interface'
=>
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'
=>
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]
=>
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