板子重启后，三秒钟内在串口0上面随意输入字符，然后输入help命令看到如下结果
Helper2416 # help
? - alias for 'help'
autoscr - run script from memory
base - print or set address offset
bdinfo - print Board Info structure
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 - invoke DHCP client to obtain IP/boot params
dnw - initialize USB device and ready to receive for Windows server (specific)
echo - echo args to console
erase - erase FLASH memory
exit - exit script
ext2load- load binary file from a Ext2 filesystem
ext2ls - list files in a directory (default /)
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
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
insnand - install SD/MMC bootloader image to NAND flash
itest - return true/false on integer compare
loadb - load binary file over serial line (kermit mode)
loads - load S-Record file over serial line
loady - load binary file over serial line (ymodem mode)
loop - infinite loop on address range
md - memory display
mm - memory modify (auto-incrementing)
mmcinit - init mmc card
movi - moviNAND sub-system
mtest - simple RAM 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
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
sleep - delay execution for some time
test - minimal test like /bin/sh
tftpboot- boot image via network using TFTP protocol
version - print monitor version
Helper2416 #
显示uboot版本
输入 最后一个命令 version，
Helper2416 # version
U-Boot 1.3.4 (Mar 4 2014 - 16:19:04) for SMDK2416
Helper2416 #
输入help nand命令后，出现以下信息：
Helper2416 # help nand
nand info - show available NAND devices
nand device [dev] - show or set current device
nand read[.jffs2] - addr off|partition size
nand write[.jffs2] - addr off|partiton size - read/write `size' bytes starting
at offset `off' to/from memory address `addr'
nand write[.yaffs[1]] - addr off|partition size - write `size' byte yaffs image
starting at offset `off' from memory address `addr' (.yaffs1 for 512+16 NAND)
nand erase [clean] [off size] - erase `size' bytes from
offset `off' (entire device if not specified)
nand bad - show bad blocks
nand dump[.oob] off - dump page
nand scrub - really clean NAND erasing bad blocks (UNSAFE)
nand markbad off - mark bad block at offset (UNSAFE)
nand biterr off - make a bit error at offset (UNSAFE)
nand lock [tight] [status] - bring nand to lock state or display locked pages
nand unlock [offset] [size] - unlock section
nand info信息如下：
Helper2416 # nand info
Device 0: NAND 256MiB 3,3V 8-bit, sector size 128 KiB
nand bad 信息如下：
Helper2416 # nand bad
Device 0 bad blocks:
0f480000
说明0f480000是坏块。
uboot命令解析见附件
uboot.pdf
(1.34 MB, 下载次数: 7)
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