elusive BIOS workaround code

Hi, I'm running 2.4.20 on an embedded system here, and have the following annoying message at boot:

"PCI: Device 00:1f:1 not available because of resource collisions".

On this system that PCI device is a "82801CA IDE U100".

Googling a bit suggests that it's a BIOS problem and that there are workarounds in ac kernels:

http://www.ussg.iu.edu/hypermail/linux/kernel/0211.3/0991.html
http://www.clustermatic.org/pipermail/linuxbios/2002-September/000228.html

Now I can't apply all of 2.4.20-ac2 as that would invalidate the extensive testing, so I was wondering if anyone could point to the pertinent code.

cheers,
Pádraig.