Subject: Re: Symbios 53c875
To: Stephen M Jones <>
From: Manuel Bouyer <>
List: port-alpha
Date: 07/28/2001 15:03:06
On Fri, Jul 27, 2001 at 08:51:00PM -0500, Stephen M Jones wrote:
> I'm working on an install of 1.5.1 on a 5305 with a Symbios dual port
> NCR53c875.  There are 5 devices on channel A and none of B.
> Termination is set at the controller (BTW, this is the 'intraserver'
> card that also has an ethernet interface!).

A compaq adapter, with 2 NCR53c875 + a 21243 behind a PCI/PCI bridge ?
I've such an adapter in my DS20

> Booting starts as normal.  The NCRs are probed and the disks on Channel
> A show up, however when the Channel B is probed it comes back with
> 'probe(scsibus2:0:0): command timeout'
> I double checked termination and even placed a terminator on
> the controller's internal interface for channel B.  same result.

Hum, this doesn't prevent normal operation, does it ?
I don't have this problem on my DS20, but I've devices on both channels
(internal and external).

A Tekram DC-390 doesn't have any problems without devices, but I've got
problems with older 53c810 has the same behavior when the bus is empty.
This is a hardware problem and nothing much can be done about it.
Can't you move some devices from channel A to B (BTW it would also improve
performances :) ?

Manuel Bouyer <>