freebsd stable - May 2005 - FreeBSD 5.4-RELEASE fails to detect IDE controller

Hello,

I have a query as to why FreeBSD 5.3 recognises my Packard Bell's IDE 
controller/Hard drive but FreeBSD 5.4-RELEASE does not?
I believe it is a GA-6WMM7 Gigabyte motherboard with a 500mhz celeron & 
128mb ram (crappy system i know but it will do as a testing server).

cheers,
Jayton