Mounting NFS root file system fails on Mini2451

Doug Abbott
I'm trying to mount a root file system over NFS on a Mini2451 with the
Superboot boot loader. First of all, I have to say I am distinctly
unimpressed with Superboot. Compared with open source solutions like u-boot
and barebox, it's a sorry excuse for a boot loader unless there's some more
extensive documentation that I don't know about.

Anyway, my Linux-CommandLine is:
    root=/dev/nfs nfsroot=192.168.1.2:/home/target_fs-1 init=/linuxrc
console=ttySAC0,115200 ip=192.168.1.230

The boot log gets to:
    Sending DHCP and RARP requests

Which I really don't understand because the kernel command line has a fixed
IP address. Why is it sending DHCP and RARP requests?

Next comes a whole series of messages:
    DHCP/BOOTP: Ignoring delayed packet

This process repeats over and over, with the Ethernet link going down and
up, until I turn off power.

Any suggestions? I'm researching this on the web but haven't found anything
particularly useful yet.

TIA