linux-kernel - Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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Message-ID:  <loom.20080109T204856-761@post.gmane.org>
Date:	Wed, 9 Jan 2008 21:01:30 +0000 (UTC)
From:	Matthieu castet <castet.matthieu@...e.fr>
To:	linux-kernel@...r.kernel.org
Subject:  Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

Hi,

David P. Reed <dpreed <at> reed.com> writes:

> And actually, if I had looked at the /sys/bus/pnp definitions, rather 
> than /proc/ioports, I would have noticed that port 80 was part of a 
> PNP0C02 resource set.   That means exactly one thing:  ACPI says that 
> port 80 is NOT free to be used, for delays or anything else.

I have some computers where port 0x80 is claimed by 8237A DMA controller [1]
But in this case it seems a lasy acpi programmer that doesn't want to convert
the hole in  0x80-0x8f range...

PS : I post from gmane web interface, so I can't keep CC.

[1]
This happen with a old 7 years old siemens PIII and a new hp core2duo.
state = active
io 0x0-0xf
io 0x80-0x8f
io 0xc0-0xdf
dma 4 

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