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

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Date:	Tue, 01 Jan 2008 18:27:05 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Christer Weinigel <christer@...nigel.se>
CC:	Rene Herman <rene.herman@...access.nl>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>,
	Rene Herman <rene.herman@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Rolland <rol@...917.net>,
	Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

Christer Weinigel wrote:
> 
> Both 0xed and 0xf0 are mapped to internal functions on the AMD Elan
> SC400 processor.  It is an AMD 486 based system on a chip and since AMD
> just knew that it would never have a math coprocessor, they reused the
> 0xf0-0xf2 range for the PCMCIA controller.  I guess the AMD Elan SC500
> will have similar problems.
> 
> I seem to recall that back when I was working with the Elan SC400
> (sometime around 1998?) there were discussions about finding an
> alternate delay port because outb to 0x80 messed up the debug port.  I
> think the Elan stopped those discussions because just about every port
> on the Elan was reused for some alternate purpose.  
> 

Yeah, the Elan is not supportable anyway without a CONFIG option (it's 
broken in so many ways), so it doesn't really apply.  It's a fuckwit design.

	-hpa
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