/info files on boot CDs

Dear suse-autoinstall people, We have machines without floppies and we want to use an /info file. I understand I can make one and put it in the /initrd on the boot CD. I can probably manage this using the mkinitrd scripts etc, but how would I then create a boot CD ISO image? I am hoping there is a magic mkisofs command line that will fetch what I need out of the boot/loader directory of the SuSE 9.3 distribution and make me a new boot CD. Can anyone point me at more info? Thanks Ian