一、配置网络部分，主要是使能CONFIG_IP_PNP以在2中可以看到Root file system on NFS选项linux
Networking support 网络
Networking options ide
TCP/IP networkingspa
IP: kernel level autoconfigurationip
[*] IP: DHCP supportit
[*] IP: BOOTP supportio
二、配置开启nfs服务console
File systems ---> class
Network File Systems --->cli
<*> 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
三、在uboot中设置以下启动参数（IP根据实际使用更改）
setenv bootargs root=/dev/nfs nfsroot=192.168.1.141:/root/porting_x210/rootfs ip=192.168.1.10:192.168.1.141:192.168.1.1:255.255.255.0::eth0:off init=/linuxrc console=ttySAC2,115200