If I'm correct, your CD-Rom connects via PCMCIA?
If so, I ran into the same problem. It turns out that the pcmcia supplemental installation disk doesn't contain the necessary module for IDE devices. I guess it's more geared toward network devices. Anyway...
What you need to do is find the module ide-cs.o.gz
and copy it to a floppy. Then you can load the module manually.
So your steps would be:[list=1][*]boot disk[*]root disks[*]copy the ide-cs.o.gz to /[*]load the pcmcia supplemental disk[*]It might try to load the module and fail. Manually load it by [i]insmod /ide-cs.o.gz[/list=1]
Your CD-Rom should then spring into action and you can continue with setup.
I have to give thanks to Excalibur here on LQ for explaining how to do this. here's a link to the thread that got me through this.