TFTP-uImage-NFS-rootfs :
FL2440 # printenv
baudrate=115200
ethaddr=08:00:3e:26:0a:5b
bootdelay=1
bootfile="uImage"
filesize=23A08
fileaddr=30000000
netmask=255.255.255.0
ipaddr=192.168.2.211
serverip=192.168.2.212
bootcmd=tftp 30008000 uImage;bootm 30008000
gateway=192.168.2.1
bootargs=mem=128M console=ttySAC0 115200 root=/dev/nfs nfsroot=192.168.2.212:/home/nfs/root rw nolock rsize=1024 wsize=1024 ip=192.168.2.211:192.168.2.212:192.168.2.1:255.255.255.0::eth0:off
stdin=serial
stdout=serial
stderr=serial
Environment size: 467/262140 bytes
uboot boot args,布布扣,bubuko.com
原文：http://www.cnblogs.com/ganrui/p/3821478.html