From owner-freebsd-stable  Tue Apr  4  6:35:33 2000
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Date: Tue, 04 Apr 2000 15:36:34 +0200
From: Edwin Mons <e.mons@spcgroup.nl>
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To: Soren Schmidt <sos@freebsd.dk>
Cc: freebsd-stable@freebsd.org
Subject: Re: ata sad combinatorics
References: <200004041322.PAA87696@freebsd.dk>
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Soren Schmidt wrote:
> 
> It seems Mike Tancsa wrote:
> >
> > Have a search through the archives as I think someone else had problems
> > with the Fujitsus.  What if you disable DMA.  Are you actually using the
> > drive in Win98 with DMA drivers ? What if go back to PIO mode.  Perhaps the
> > maintainer can shed light on it ?
> 
> > >atapci0: <Intel PIIX
> > >ATA controller> port 0xffa0-0xffaf at device 7.1 on pci0
> > >ata0: at 0x1f0 irq
> > >14 on atapci0
> > >ata1: at 0x170 irq 15 on atapci0
> 
> The old Intel PIIX is know to have DMA problems, I never intended to
> support it, but the current code (from luiqi IIRC) was found to be
> sufficient IF the BIOS did its job right. I seems that we have a
> BIOS here that doesn't setup things the way they should be, and the
> DMA setup fails because of that. Is there any way you could upgrade
> your BIOS ??

I've seen similar problems with a machine with an old VIA chipset. 
FWIW: I think we need a way to tell the kernel before booting that it
shouldn't even try to use DMA/UDMA.  Something like the good old device
flags..

Regards,
Edwin Mons


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