1、配置网络部分，主要是使能CONFIG_IP_PNP以在2中能够看到Root file system on NFS选项
Networking support
Networking options
TCP/IP networking
IP: kernel level autoconfiguration
[*] IP: DHCP support
[*] IP: BOOTP support
2、配置开启nfs服务
File systems --->
Network File Systems --->
<*> NFS client support
[*] NFS client support for NFS version 3 [*] NFS client support for the NFSv3 ACL protocol extension
[*] NFS client support for NFS version 4 (EXPERIMENTAL)
[*] NFS client support for NFSv4.1 (DEVELOPER ONLY)
[*] Root file system on NFS
3、在uboot中设置如下启动参数（IP根据实际使用更改）
setenv bootargs root=/dev/nfs nfsroot=192.168.1.105:/mnt/rootfs/rootfs ip=192.168.1.88:192.168.1.105:192.168.1.1:255.255.255.0::eth0:off init=/linuxrc console=ttySAC2,115200
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