Subject: Re: DMA and interrupt errors on DS10?
To: Eric Schnoebelen <>
From: Manuel Bouyer <>
List: port-alpha
Date: 02/09/2005 22:37:44
On Wed, Feb 09, 2005 at 02:46:41PM -0600, Eric Schnoebelen wrote:
> "Johan A.van Zanten" writes:
> - I've talked to a few friends who work with modern "PCish" hardware more
> - than i, and i'm almost certain it's the cables which are garden-variety
> - 40-pin, not the fancier 80-wire types meant for the newer, faster DMA
> - drives.  I'll try some betetr cables.
> 	Won't help, as the onboard IDE Controoller isn't able to
> do more than PIO/ATA4.  

Hum, no this controller should be able to do Ultra/33. Even if 80-wire cable
are not required for Ultra/33, I found that it helped in some cases.

> 	The reason you see the "degrade" is the driver tries
> what the drives claim they can do, but the controller chip
> fails..(or thats what I think happens..)

The driver tries to do the min of what drives and controller are capable.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference