@Hyperspeed: probably is need it something like the boot code of the floppys or rdb of hard disks. makecd writes rock ridge bootable code if i understand it right.
-edit-
the other and simple solution is a bootable floppy that direct the boot process to the cdrom as the emergency disk of os3,5-9 and the boot disk of a590 in the amiga500 with kick 1.2