Hm, I have no clue whatsoever, but I've always though that some of the later acceleratorcards let the user boot from CD's just like from a hd or floppy, as long as there were a s:startup-sequence to be found.
The only reason for me writing this is that when I think of it, I do not know from where I got that information and why I've always taken it for granted. I'm curious aswell in this matter.