LinuxRootFilesystemUsingNFSVersion3 < DULG

%SECTION0{name=LinuxRootFilesystemUsingNFSVersion3}% Using NFSv3 for NFS Root Filesystem

   Question:: My NFS server only allows the protocol in version 3. Even though my kernel
      has "NFS client support for NFS version 3" compiled in, I cannot use 
      this as a root filesystem.  The boot process stops like this:
      <verbatim>
Looking up port of RPC 100003/2 on 10.0.0.136
Looking up port of RPC 100005/1 on 10.0.0.136
Root-NFS: Server returned error -22 while mounting /opt/eldk/ppc_6xx
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
      </verbatim>

   Answer:: In addition to the kernel support, you need to specify the "nfsvers=3" option
      to use NFS protocol version 3 as a rootfilesystem.  So include something like the
      following in your kernel commandline:
      <verbatim>
nfsroot=[<server-ip>:]<root-dir>,nfsvers=3
      </verbatim>

14.3.30. Swapping over NFS		1. Abstract		14.3.32. Using and Configuring the SocketCAN Driver
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