Subject: Re: DMA and interrupt errors on DS10?
To: None <mouse@Rodents.Montreal.QC.CA>
From: Johan A.van Zanten <>
List: port-alpha
Date: 02/08/2005 22:30:18
der Mouse <mouse@Rodents.Montreal.QC.CA> wrote:
> > wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
> > wd0(aceride0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
> > I'm seeing some errors when the kernel starts reading and writing
> > from the drive.  Once the kernel switches to using PIO mode 4 to talk
> > to the drive, the errors stop, and as far as i can tell, it's
> > functioning OK.
> > Anyone have any observations or ideas?
> Well, I've seen similar things on 1.4T i386; they don't appear to
> indicate any trouble as far as I can see.

Thanks for your help.

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.