For NFS, you just need to reconfigure/recompile the empeg kernel (aka. "Hijack"). Full source code is at the Hijack link above.

But the real problem is that adding NFS server support to the kernel will chew up another 100KB or more of kernel memory. On a Mk2a unit running v2final (as opposed to a Mk2 unit, or running v3alpha), that should be fine.

Cheers