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Date:      Sat, 11 Aug 2001 01:34:47 -0400 (EDT)
From:      Adam Blake Michalak <blake@sba.miami.edu>
To:        Joe Clarke <marcus@marcuscom.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: trouble with Adaptec 2940 Ultra SCSI adapter
Message-ID:  <Pine.OSF.4.21.0108110125180.452349-100000@homer.bus.miami.edu>
In-Reply-To: <20010810163126.J36120-100000@shumai.marcuscom.com>

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Good to hear from you Joe.  Apparently I am having issues with my
shared IRQ's.  Actually, all three pci slots on this old Gatway 2000
P5-66 use IRQ 9.  (that would be the SCSI card, the graphics card,
and the 1000baseT card.)  I have no options on the cards locally
(dip switches) of changing the card's IRQ, and the BIOS does not
offer much help.  The only IRQ realated options in the BIOS 
are to set IRQ's 9,
10, and 11 to a status of "FREE" or "USED".  If I turn 9 off and 10
and/or 11 on, the pci slots still all come up with the same IRQ.
When I only had the video and SCSI cards installed this error was
not noticed.  However, with the addition of the 100baseT ethernet
card (thus using all three pci slots) this error has become more
prevalent.

Any thoughts?

-Adam


On Fri, 10 Aug 2001, Joe Clarke wrote:

Hey, Adam.  Looks like an IRQ conflict.  Have you tried seeing if the BIOS
can rearrange system resources so that these cards fall on different IRQs?
Also, what version of FreeBSD is this?  I have a 4.4-PRERELEASE machine
with shared IRQs, and I'm not seeing any problems.

Joe Clarke

On Fri, 10 Aug 2001, Adam Blake Michalak wrote:

> Greetings
>
> I have had a P2 system up for months with the following SCSI card
> Adaptec 2940 Ultra SCSI adapter at irq 9 at device 6.0 on pci0
>
> Everything has been working fine for months.
>
> Last night I added a 3Com 3c905B-TX Fast Etherlink XL 100baseT card
> which also lives on irq 9 at device 12.0 on pci0
>
> Now once in a while I keep getting these random kernel errors from
> the SCSI card
>
> here is the output from dmesg...
>
> ahc0: PCI error Interrupt at seqaddr = 0x7
> ahc0: Data Parity Error Detected during address or write data phase
> ahc0: PCI error Interrupt at seqaddr = 0x9
> ahc0: Data Parity Error Detected during address or write data phase
> ahc0: PCI error Interrupt at seqaddr = 0x9
> ahc0: Data Parity Error Detected during address or write data phase
> ahc0: PCI error Interrupt at seqaddr = 0x8
> ahc0: Data Parity Error Detected during address or write data phase
> ahc0: PCI error Interrupt at seqaddr = 0x9
> ahc0: Data Parity Error Detected during address or write data phase
>
>
> CAn anybody explain to me what this means and what I can do to
> correct this error?
>
> -Adam
>
>
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