U-Boot> help, 命令集

U-Boot> help

?       - alias for 'help'

base    - print or set address offset

boot    - boot default, i.e., run 'bootcmd'

bootd   - boot default, i.e., run 'bootcmd'

bootm   - boot application image from memory

bootp   - boot image via network using BOOTP/TFTP protocol

cmp     - memory compare

coninfo - print console devices and information

cp      - memory copy

crc32   - checksum calculation

dhcp    - boot image via network using DHCP/TFTP protocol

echo    - echo args to console

erase   - erase FLASH memory

fatinfo - print information about filesystem

fatload - load binary file from a dos filesystem

fatls   - list files in a directory (default /)

flinfo  - print FLASH memory information

go      - start application at address 'addr'

help    - print online help

imxtract- extract a part of a multi-image

itest   - return true/false on integer compare

loadb   - load binary file over serial line (kermit mode)

loady   - load binary file over serial line (ymodem mode)

loop    - infinite loop on address range

md      - memory display

mm      - memory modify (auto-incrementing address)

mtest   - simple RAM read/write test

mw      - memory write (fill)

nand    - NAND sub-system

nboot   - boot from NAND device

nfs     - boot image via network using NFS protocol

nm      - memory modify (constant address)

ping    - send ICMP ECHO_REQUEST to network host

printenv- print environment variables

protect - enable or disable FLASH write protection

rarpboot- boot image via network using RARP/TFTP protocol

reset   - Perform RESET of the CPU

run     - run commands in an environment variable

saveenv - save environment variables to persistent storage

setenv  - set environment variables

sleep   - delay execution for some time

tftpboot- boot image via network using TFTP protocol

usb     - USB sub-system

usbboot - boot from USB device

version - print monitor version

U-Boot> printenv

bootargs=mem=32M console=ttyS0,115200 initrd=0x21900000,5242880 root=/dev/ram0 rw 

bootcmd=nand read 0x21000000 0x100000 0x200000; nand read 0x21900000 0x400000 0x200000; bootm 0x21000000 

bootdelay=1

baudrate=115200

ethaddr=22:33:11:44:55

ipaddr=192.168.1.140

serverip=192.168.1.100

netmask=255.255.255.0

stdin=serial

stdout=serial

stderr=serial

ethact=macb0





Environment size: 360/131067 bytes