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

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Message-ID: <4779329A.5070305@zytor.com>
Date:	Mon, 31 Dec 2007 10:19:06 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	"David P. Reed" <dpreed@...d.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rene Herman <rene.herman@...access.nl>,
	Ingo Molnar <mingo@...e.hu>, Islam Amer <pharon@...il.com>,
	Pavel Machek <pavel@....cz>, Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override

Alan Cox wrote:
> On Sun, 30 Dec 2007 16:23:20 -0800
> "H. Peter Anvin" <hpa@...or.com> wrote:
> 
>>> continuing to investigate for a cause.  It would be nice if it were a 
>>> BIOS-fixable problem.  It would be even nicer if the BIOS were GPL...
>> If it was an SMM trap, I would expect it to be trapped in the SuperIO chip.
> 
> Many SuperIO chips do port 0x80, but they do it over the LPC and they do
> it in hardware to the parallel port data lines. The timings posted for
> 0x80 on his box are really a bit fast for LPC.

Ah, that would eliminate the SuperIO chip.

	-hpa
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