uboot命令

? - alias for 'help'
askenv - get environment variables from stdin
base - print or set address offset
bdinfo - print Board Info structure
bmp - manipulate BMP image data
boot - boot default, i.e., run 'bootcmd'
bootd - boot default, i.e., run 'bootcmd'
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
cmp - memory compare
coninfo - print console devices and information
cp - memory copy
crc32 - checksum calculation
date - get/set/reset date & time
dcache - enable or disable data cache
dhcp - boot image via network using DHCP/TFTP protocol
echo - echo args to console
editenv - edit environment variable
eeprom - EEPROM sub-system
erase - erase FLASH memory
exit - exit script
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
fsinfo - print information about filesystems
fsload - load binary file from a filesystem image
go - start application at address 'addr'
help - print online help
i2c - I2C sub-system
icache - enable or disable instruction cache
iminfo - print header information for application image
imls - list all images found in flash
imxtract- extract a part of a multi-image
itest - return true/false on integer compare
loadb - load binary file over serial line (kermit mode)
loads - load S-Record file over serial line
loadx - load binary file over serial line (xmodem mode)
loady - load binary file over serial line (ymodem mode)
loop - infinite loop on address range
ls - list files in a directory (default /)
md - memory display
mm - memory modify (auto-incrementing address)
mmc - MMC sub-system
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
reginfo - print register information
reset - Perform RESET of the CPU
run - run commands in an environment variable
saveenv - save environment variables to persistent storage
setenv - set environment variables
showvar - print local hushshell variables
sleep - delay execution for some time
source - run script from memory
test - minimal test like /bin/sh
tftpboot- boot image via network using TFTP protocol
unzip - unzip a memory region
usb - USB sub-system
usbboot - boot from USB device
version - print monitor version

bootm

引导启动存储在内存中的程序映像

# bootm [addr [arg ...]]
Sub-commands to do part of the bootm sequence. The sub-commands must beissued in 
    the order below (it's ok to not issue all sub-commands): 
            start [addr [arg ...]] 
            loados - load OS image 
            cmdline - OS specific command line processing/setup 
            bdt - OS specific bd_t processing 
            prep - OS specific prep before relocation or go 
            go - start OS

第一个参数:映像地址
第一个参数:通常是Ramdisk映像存储地址;也可以是传递给Linux内核的参数(缺省情况下传递bootargs环境变量)

例:

# bootm kernel_addr ramdisk_addr device_tree_addr

如果不想加载ramdisk,用’-‘代替即可

bootp

通过TFTP协议下载文件到内存

# bootp [loadAddress] [bootfilename]

loadAddress:文件存放的内存地址
bootfilename:文件名称

cmp

内存比较

# cmp [.b, .w, .l] addr1 addr2 count

b:1Byte
w:2Byte
l:4Byte

例:cmp.b,下同

cp

内存复制

# cp [.b, .w, .l] source target count

source:原地址
target:目的地址

注:这个地址如果在Flash中,那么会直接调用写Flash的函数操作。uboot写Flash就使用这个命令,当然要先擦除对应Flash

crc32

计算存储数据的校验和

# crc32 address count [addr]

address:起始地址
addr:结果地址

echo

回显参数

# echo [args..]

erase

擦除Flash

# erase start end
# erase N:SF[-SL]
# erase bank N
# erase all

start:块起始地址
end:块结束地址
N:Flash组号
SF:起始扇区号
SL:结束扇区号
all:全部Flash

flinfo

# flinfo
# flinfo N

flinfo:Flash组信息
N:某个组

go

# go addr [arg ...]

addr:程序入口地址
arg:参数

iminfo

映像的开头信息(序列号、头和校验和)

# iminfo addr [addr ...]

addr:起始地址
…:多地址

loadb

通过串口Kermit协议下载二进制数据

# loadb [ off ] [ baud ]

loads

通过串口线下载S-Record格式文件

# loads [ off ]

mw

写内存

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

address:内存地址
value:写的值
count:单位值的数目

nm

修改内存

# nm [.b, .w, .l] address

address:读出并且修改的内存地址

md

显示内存的内容

例:

# md.w 0x8200000 0x8

mm

修改内存

nfs

通过NFS协议启动网络映像

# nfs [loadAddress] [host ip addr:bootfilename]

loadAddress:内存地址

printenv

打印环境变量

# printenv 
# printenv name ...

name:变量名

protect

Flash写保护

# protect on/off start end
# protect on/off N:SF[-SL]
# protect on/off bank N
# protect on/off all

on:写保护
off:解除保护

rarpboot

通过TFTP启动网络映像

# rarpboot [loadAddress] [bootfilename]

run

执行环境变量中的命令

# run var [...]

setenv

设置环境变量

# setenv name value ...
# setenv name

注:设置包含特殊字符时需要用”

# setenv bootcmd 'nand read...'

saveenv

保存环境变量。将变量写入flash

注:变量空间只有8k

sleep

延迟N秒钟执行,N为十进制数

# sleep N

tftpboot

# tftpboot [loadAddress] [bootfilename]

通过TFTP协议下载文件

ping

uboot ping 别的主机

usb

# usb start
# usb info
# usb scan

start:启动usb
info:列出设备
scan:扫描usb设备

kgo

启动没有压缩的linux内核

fatls

列出DOS FAT文件系统

fatload

读入FAT中的一个文件

与环境变量相关
bootdelay:执行自动启动的等候秒数
baudrate:串口波特率
netmask:以太网的网络掩码
ethaddr:以太网的MAC地址
bootargs:传递给Linux内核的启动参数
bootcmd:自动启动时执行命令
serverip:TFTP服务器端的IP地址
ipaddr:本地的IP地址

Nand Flash相关

# nand info

显示可使用的Nand Flash

# nand read addr off size

从Nand的 off 偏移地址处读取size字节的数据到SDRAM的addr地址

# nand write addr off size

将SDRAM的addr地址处size字节的数据烧写到Nand的 off 偏移地址

# nand write[.yaffs[1]] addr off size 

例:

# nand write.yaffs 0x8000000 0x100000 0

0:自动判断文件大小去烧写

# nand erase [clean] [off size]

擦除Nand Flash的 off 偏移地址处的size字节的数据

# nand bad

显示Nand Flash的坏块

# nand dump[.oob] off

显示Nand Flash中的数据(16进制)

# nand scrub

彻底擦除整块Nand Flash中的数据,包括OOB。可以擦除软件坏块标志

# nand markbad off

标识Nand的 off 偏移地址处的块为坏块

Nor Flash
Nor Flash的烧写时序和SDRAM的写入不同,烧写Nor Flash不能使用mm等命令,只能使用cp命令从内存拷贝到Nor Flash,而且烧写之前必须解除保护并擦除
Nor Flash擦除的最小单位是Sector,也就是0x10000字节。如果你定义的大小不满1 Sector或超过Sector的边界,那么被定义到的Sector会被全部擦除

posted @ 2016-07-28 00:06  thomas_blog  阅读(239)  评论(0编辑  收藏  举报