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Date: Thu,  5 Aug 1999 16:51:39 -0700 (PDT)
From: phillip@www4.au.freebsd.org
To: freebsd-gnats-submit@freebsd.org
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Subject: i386/12993: "ahc0: Data Parity Error Detected during address or write data phase" kernel message
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>Number:         12993
>Category:       i386
>Synopsis:       "ahc0: Data Parity Error Detected during address or write data phase" kernel message
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug  5 17:00:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Phillip Musumeci
>Release:        FreeBSD 3.2 RELEASE
>Organization:
RMIT University
>Environment:
FreeBSD josephine.net.at.home 3.2-RELEASE FreeBSD 3.2-RELEASE #0: Sat Jul 24 23:54:55 EST 1999     phillip@josephine.net.at.home:/usr/src/sys/compile/barton  i386

>Description:
I was getting errors messages from the ahc driver, for a card that was
probed as

ahc0: <Adaptec 2940 Ultra SCSI adapter> rev 0x00 int a irq 11 on pci0.8.0
ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs

(adaptec 2940UW) and with a Seagate SCSI UW disk probed as

da0: <SEAGATE ST36530W 1487> Fixed Direct Access SCSI-2 device 
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da0: 6208MB (12715920 512 byte sectors: 255H 63S/T 791C)

I found that these warning messages could be stopped by making sure
that the PC BIOS allocated a unique interrupt to the PCI SCSI adaptec
card.  Previously, the BIOS was allocating the same interrupt to the
apdaptec card as was being allocated to some other PCI cards.

>How-To-Repeat:
With the adaptec 2940UW card sharing an IRQ with other cards: the kernel
warning messages appear.

>Fix:
Configure your PC's BIOS to have at least two IRQs allocated to the PCI
bus if you have a 2940UW and other PCI cards needing an IRQ.  In my
case, my FIC VA503+ motherboard's bios will then allocate an IRQ for 
sole use by the 2940UW card and all is fine.

Hope this helps others.



>Release-Note:
>Audit-Trail:
>Unformatted:


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