nfs根文件

http://www.denx.de/wiki/DULG/LinuxNfsRoot

• root=/dev/nfs rw: the root filesystem will be mounted using NFS, and it will be writable.

• nfsroot=192.168.1.1:/opt/eldk-4.2/ppc_4xx: the NFS server has the IP address 192.168.1.1, and exports the directory /opt/eldk-4.2/ppc_4xx for our system to use as root filesystem.

• ip=192.168.100.6:192.168.1.1:192.168.1.1:255.255.0.0:canyonlands:eth0:off: the target has the IP address 192.168.100.6; the NFS server is 192.168.1.1; there is a gateway at IP address 192.168.1.1; the netmask is 255.255.0.0 and our hostname is canyonlands. The first ethernet interface (eth0) willbe used, and the Linux kernel will immediately use this network configuration and not try to re-negotiate it (IP autoconfiguration is off).

Kernel command line: root=/dev/nfs rw nfsroot=192.168.1.1:/opt/eldk-4.2/ppc_4xxFP/ ip=192.168.100.6:192.168.1.1:192.168.1.254:255.255.0.0:canyonlands:eth0:off panic=1 console=ttyS0,115200

http://fxr.watson.org/fxr/source/Documentation/nfsroot.txt?v=linux-2.6