Discless 5.1

[Neal Nelson]

I've been using FreeBSD-Stable for some time on my CompactFlash based 
firewall. I was thinking of moving to FreeBSD-5.1 but the rc system has 
changed. Does anyone know how to set up a discless 5.12 system like 
using rc.diskless2 on -stable?

As an aside: does anyone know if it's possible to compile a 5.1 world 
on -stable? Mine seems to fail and I don't want to upgrade my server 
until 5 goes stable.