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SubjectIRQ problems w/VIA Apollo VP2/97 & NCR 53c875
Summary: IRQ conflict on VIA Apollo VP2/97-based motherboard between
dual controllers on NCR 53c875 (Diamond Fireport 40). Kernel version is
2.4.5-ac9.

--- cut here ---

00:00.0 Host bridge: VIA Technologies, Inc. VT82C595/97 [Apollo VP2/97]
(rev 04)
Flags: bus master, 66Mhz, medium devsel, latency 64

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA
[Apollo VP] (rev 25)
Flags: bus master, medium devsel, latency 0

00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06)
(prog-if 8a [Master SecP PriP])
Flags: bus master, medium devsel, latency 64
I/O ports at 6000 [size=16]

--- cut here ---

When I attempt to mobprobe the ncr53c8xx module, I get the following
output:

SCSI subsystem driver Revision: 1.00
PCI: Found IRQ 11 for device 00:0b.0
IRQ routing conflict in pirq table for device 00:0b.0
IRQ routing conflict in pirq table for device 00:0b.1

It appears that something is getting confused and doesn't want to allow
the two controllers of this card to share the same IRQ.

Here is the relevent output from 'lspci -v':

--- cut here ---

00:0b.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR)
53c875 (rev 14)
Subsystem: Diamond Multimedia Systems FirePort 40 Dual SCSI
Controller
Flags: bus master, medium devsel, latency 144, IRQ 10
I/O ports at 6c00 [size=256]
Memory at e2001000 (32-bit, non-prefetchable) [size=256]
Memory at e2002000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=64K]

00:0b.1 SCSI storage controller: Symbios Logic Inc. (formerly NCR)
53c875 (rev 14)
Subsystem: Diamond Multimedia Systems FirePort 40 Dual SCSI
Controller
Flags: bus master, medium devsel, latency 144, IRQ 10
I/O ports at 7000 [size=256]
Memory at e2003000 (32-bit, non-prefetchable) [size=256]
Memory at e2004000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=64K]

--- cut here --

There are no other devices using IRQ10. Is this a lost cause? This
controller and drives in their current configuration can be moved to an
Intel based machine and works flawlessly. I have yet to see this
controller work on this VIA motherboard.

Any assistance is appreciated.

Thanks,

Mike.
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