[Cooker] building a bootable Mandrake CDROM - which image file for booting?

[Hugo Rabson]

I've copied the whole Mandrake 7.0 CDROM tree from CD to an ext2 partition.
I can boot from the ext2 partition via a floppy with the 'hd.img' image
written to it. However, I can't figure out which IMG file I need for the
CD.

# cd /mnt/scratch         <-- where the CD filesystem tree was copied to
# mkisofs -b images/txt_boot.img \        <--- the IMG file
    -c boot.cat -o /tmp/mandrake.iso \
    -J -r -T \
    -p LinuxMandrake \
    -P www.mandrakesoft.com \
    -A Linux_Mandrake_7.0_GPL_version \
    -V LM70GPL \
    .

I can boot from a "CD floppy" (# dd if=cd.img of=/dev/fd0) onto the CD, so
I'm convinced the filesystem is okay. However, it won't boot if I use the
cdrom.img file. It _will_ boot if I use txt_boot.img but that image doesn't
trigger the graphical install routine, which is the routine I need to use.

Any ideas? :) All suggestions are appreciated.

Hugo