aic7xxx probe/driver install hangs installing RH enterprise 4

[Todd Carter]

Hello,

I've got an Adaptec AIC7899 SCSI interface on an IBM intellistation (MP) 
that's giving me fits.

I've searched for a solution and tried:
linux noprobe then selecting the aic7xxx driver during the install phase 
(still hangs)
linux apic (no luck)

I've tried Scientific Linux 4.3 (Redhat AS 4 variant), RH Ent 4 WS which 
don't work.
However the venerable Fedora Core 4 works!

Are there any parameters I can pass to the driver install that may get 
me passed this?

Thanks,
Todd