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Description of problem:
This is happening on a dual-64bit Intel Xeon machine, with the x86_64
version of FC2 installed. It has two SATA drives installed, and has an
MPT SCSI controller.

The machine boots with no problems when using the stock kernel. However,
once I've upgraded the kernel with version 2.67-1.494.2.2. or higher 
from the released updates, the machine oopses on boot. The oops seems
to be happening when loading the mptbase or mptscsih module.

Version-Release number of selected component (if applicable):
kernel-2.6.7-1.494.2.2 and higher

How reproducible:
Always

Steps to Reproduce:
1.install fedora core 2
2.upgrade kernel to 2.6.7-1.494.2.2.x86_64 with rpm -Uvh
3.reboot

    

Actual Results:  I'll attach the full boot output to this case, but
here's a description.

The machine starts booting, prints a few error messages, then pauses
for a minute after the "Doorbell ACK timeout" message. It then prints
the rest of the error messages, then sits there forever after
displaying the "libata" line.

Expected Results:  On the stock Core 2 kernel, 2.6.5-1.358smp, the
boot messages look like this:

PCI: Cannot allocate resource region 0 of device 0000:01:00.1
PCI: Cannot allocate resource region 0 of device 0000:01:00.3
audit(1094853305.282:0): initialized
agpgart: Unsupported Intel chipset (device id: 359e)
ide0: I/O resource 0x1F0-0x1F7 not free.
ide0: ports already in use, skipping probe
Red Hat nash version 3.5.22 starting
INIT: version 2.85 booting

...and the machine boots normally.

Additional info: