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From: "Per Nyberg" <Per-Olav.Gramstad@oduciv.lu.se>
Organization:  Lund Univ, Faculty of Odontology
To: "Justin T. Gibbs" <gibbs@freefall.freebsd.org>
Date:          Mon, 29 Jul 1996 15:28:59 +0000
Subject:       Re: 2.2-960612-SNAP BUG 
Reply-To: Per.Nyberg@dalby.lu.se
Cc: bugs@FreeBSD.org
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Hello Justin!

Regarding:

> To:            Per-Olav Gramstad <Per-Olav.Gramstad@ODuciv.lu.se>
> Cc:            bugs@FreeBSD.org
> Subject:       Re: 2.2-960612-SNAP BUG 
> Date:          Wed, 24 Jul 1996 09:13:31 -0700
> From:          "Justin T. Gibbs" <gibbs@freefall.freebsd.org>

> >"/kernel: bt0: not taking commands!
> > /kernel: bt0: Debugger("bt742a") called.
> > /kernel: bt0: Abort operation has timed out"
> >
> >Our SCSI-controller is a PCI device, BusLogic BT-956C.
> >
> >Per-Olav.Gramstad@ODuciv.lu.se
> 
> Can you try disabling all the devices in your kernel(boot with the -c flag)
> including bt0 (I know it doesn't make any sense, but bt0 is the ISA device
> in this case) that you don't need and see if this helps?
> 
> --
> Justin T. Gibbs

The problem is solved. The BT 956 can be configured to be isa 
compatible in PCI mode, which probably confused FreeBSD 
2.2-960612-SNAP and 2.1.5 but not 
2.1.0. Disabling the default ISA-compatibility did the trick.

Thank you Justin for pointing out the cause of the problem, ISA. 
However disabling bt during boot didn't help.

Alive and kicking
Per-Olav.Gramstad@ODuciv.lu.se