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Date: Sat, 12 Jan 2002 00:44:09 +0100
From: Kurt Garloff <garloff@suse.de>
To: Marcelo Tosatti <marcelo@conectiva.com.br>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Richard Henderson <rth@twiddle.net>,
        Jay Estabrook <Jay.Estabrook@compaq.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.4.18pre3 - miata pci dma fix
Message-ID: <20020112004409.A23020@garloff.etpnet.phys.tue.nl>
Mail-Followup-To: Kurt Garloff <garloff@suse.de>,
	Marcelo Tosatti <marcelo@conectiva.com.br>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Richard Henderson <rth@twiddle.net>,
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Hi Marcelo, Richard, Ivan, Jay,

On Thu, Jan 10, 2002 at 06:30:07PM -0200, Marcelo Tosatti wrote:
> pre3:
>=20
[...]
> - Miata dma corruption workaround 		(Richard Henderson)
[...]

> pre2:=20
[...]
> - Alpha fixes					(Jay Estabrook)
[...]

To be honest, I expected to see the patch from Ivan go in.

He came up with the solution to disable scatter-gather for pci dma, after I
sent a patch which justs worked around the page boundary cross bug for
ide-dma on the miata/pyxis. Disabling SG for PCI DMA on miata is no problem,
as we can directly map a 2GB window of memory into PCI space.

A second patch also made sure it works for ISA (which also support 32bis on
pyxis), so the floppy controller is happy again.
This second patch is the only thing I see when having a quick look at the
2.4.18pre3 patch, and Ivan should be credited for it as far as I know.

Is this an oversight? Or is there seom magic bit switched which I overlooked
which switches off SG PCI DMA on pyxis?

Regards,
--=20
Kurt Garloff  <garloff@suse.de>                          Eindhoven, NL
GPG key: See mail header, key servers         Linux kernel development
SuSE GmbH, Nuernberg, DE                                SCSI, Security

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