Re: Linux 2.4.18pre3 - miata pci dma fix

From: Kurt Garloff (garloff@suse.de)
Date: Fri Jan 11 2002 - 18:44:09 EST

Hi Marcelo, Richard, Ivan, Jay,

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

> pre2:
[...]
> - 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, 

-- 
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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