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

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Message-ID: <20071231115902.72ab8fe7@the-village.bc.nu>
Date:	Mon, 31 Dec 2007 11:59:02 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
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

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.
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