内核支持NFS分区(即编译时在File system中选中[*] Root file system on NFS),
以及支持内核IP_PNP(即编译时在Networking中选中[*] IP: kernel level autoconfiguration)
File systems --->
Network File Systems --->
<*> NFS file system support ## 必选
[*] Provide NFSv3 client support ## 可选
[*] Root file system on NFS ## 必选
Networking --->
[*] Networking support
Networking options --->
[*] IP: kernel level autoconfiguration ## 必选
需要打开IP:Kernel level autoconfiguration 以及下面所有的选项包括DHCP, BOOTP, RARP，而且NFS Client Support不能是模块，必须编译进内核