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14.3.31. Using NFSv3 for NFS Root Filesystem

My NFS server only allows the protocol in version 3. I cannot use this as a root filesystem. The boot process stops like this:
Looking up port of RPC 100003/2 on
Looking up port of RPC 100005/1 on
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)

You need to specify the "nfsvers=3" option to use NFS protocol version 3 as a rootfilesystem. So use something like
14.3.30. Swapping over NFS 1. Abstract 14.3.32. Using and Configuring the SocketCAN Driver
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