etherboot, nfsrot

I would like to be able to boot Linux on an XBox over the network.

Currently, I have systems that use a floppy to run etherboot and
load the linux kernel over the network and the linux kernel uses
nfsroot to mount the root filesystem over the network.  The systems
are thus diskless (except for the floppy).

I would like to use a similar boot method for the XBox.  The etherboot
code would have to live on the XBox hard drive, but everything else
would come from a server on the network.

Has this already been done?

If not, can someone give me some pointers on how to get the XBox
to run the etherboot code instead of the linux kernel?

Thanks.