howto: booting from CD

[James D. Freels]

I am running GNU/Linux Debian 2.1 with an Adaptec 2940 narrow PCI scsi
card.  Everything is working fine.  I have three hard drives set at
scsi ID 0, 1, and 2 and booting off of ID=0.  I also have a Yamaha CRW
6940 rewritable cdrom drive on scsi ID=3 that is also working fine.

I would like to create a bootable CD that would serve as a backup
drive for the essential parts of my root partition.  As a test, I have
created a bootable CD that contains the Linux kernel as the bootable
image as per the instructions of the README.eltorito and man file with
the mkisofs package.

I have also configured the Adaptec BIOS to allow a bootable CD.
However, the scsi ID of the bootable image remains at ID=0 (the hard
drive).  I have an Intel SE440BX-2 motherboard with the boot options
listed to first check the floppy, then "removable hard drives" which I
think basically looks at the scsi chain for bootable devices after the
floppy fails to boot.

Currently, the system does not recognize the bootable CD when starting
up.  It just boots directly from the hard drive.

How can I configure the system to boot from the CD?  I would prefer to
be able to do the following sequence:

(1) boot from floppy if a bootable floppy is in the floppy drive
(2) boot from cdrom if a bootable cdrom is in the cdrom drive
(3) boot from harddrive as the final option if (1) or (2) is not
    available. 

Anyh help is appreciated

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