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Date:      Mon, 6 Dec 1999 20:17:06 +0100 (CET)
From:      Soren Schmidt <sos@freebsd.dk>
To:        dick@tar.com (Richard Seaman, Jr.)
Cc:        vallo@matti.ee (Vallo Kallaste), obrien@FreeBSD.ORG (David O'Brien), sos@FreeBSD.ORG, current@FreeBSD.ORG
Subject:   Re: ATA driver as the default
Message-ID:  <199912061917.UAA13093@freebsd.dk>
In-Reply-To: <19991206064628.G44207@tar.com> from "Richard Seaman, Jr." at "Dec 6, 1999 06:46:28 am"

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It seems Richard Seaman, Jr. wrote:
> On Mon, Dec 06, 1999 at 12:19:16PM +0200, Vallo Kallaste wrote:
> 
> > It doesn't know about SiS 5591 PCI IDE controller, the wdc controller
> > knows. I'm speaking about boot messages, nothing else. Furthermore the
> > wdc driver sets up UDMA mode on my UDMA capable disks, ata driver
> > doesn't. It claims that busmastering DMA is supported and sets up WDMA2
> > mode instead, I think it's normal as it currently doesn't know about
> > 5591. The WDMA2 isn't really that bad and otherwise I'm using ata driver
> > quite happily. Just FYI.
> 
> The one time I tried ata with my SiS 5591 board I got PIO, no
> DMA at all.  With wd I get UDMA.  This was about 2-3 weeks ago.

The SiS is supported, depending on how the BIOS sets up the chip
the ata driver will do at max wdma2 transfers.

I hope to have support before 4.0, are you guys willing to test
some patches, they might hose your disks, you have been warned :)

-Søren


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