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From: sthaug@nethelp.no
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To: hafner@forwiss.tu-muenchen.de
Cc: freebsd-scsi@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG
Subject: Re: Is my NCR controller broken?
In-Reply-To: Your message of "Thu, 18 Sep 1997 08:57:34 GMT"
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Date: Sat, 20 Sep 1997 02:14:06 +0200
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> I run a 486/DX2-66 (ASUS SP-3 with onboard NCR-810 SCSI
> controller). This computer runs for about 3 years now (2.0.5, 2.1.0,
> 2.1.5)
> 
> Since about four weeks I keep getting SCSI resets and then the bus is
> dead. No recovery! And it's really strange because the NCR controller
> reports totally different errors before hanging. Here are the error
> reports from the last three crashes (typed in by hand, so the actual
> format may differ):
> 
> -------------------------------------------------------------------------------
> 
> sd1(ncr0:1:0): internal error: cmd00 != 91=(vdsp[0] >> 24)
> ncr0: timeout ccb=f19fbc00 (skip)

I have a PVI486-SP3 with AMD 5x86-133 processor and ASUS PCI-SC200 SCSI
controller. It works very well for me. I had *one* problem initially,
which may be relevant: Some versions of the PVI486-SP3 motherboard (I
have version 1.22) have an "IDE prefetch buffer". This *must be* turned
off if you use PCI bus master cards (such as a 53c810 card). This is
explicitly mentioned in my PVI486-SP3 manual at page 3-15.

Before I turned off the "IDE prefetch buffer" in the BIOS, I got errors
similar to yours.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no