挂载nfs测试
setenv bootargs console=ttyS1,115200n8 noinitrd rw ip=192.168.1.101:192.168.1.100:192.168.1.1:255.255.255.0:::off eth=00:CC:CC:A0:00:24 root=/dev/nfs nfsroot=192.168.1.247:/home/mao/disk1/workroom/bj_sdk/ipcam/dbvt/filesys, nolock mem=48M
tftpboot 0x80700000 uImage_ipnc_dm365_nfs
bootm 0x80700000