Message-ID: <4779329A.5070305@zytor.com>
Date: Mon, 31 Dec 2007 10:19:06 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: "David P. Reed" <dpreed@reed.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Rene Herman <rene.herman@keyaccess.nl>, Ingo Molnar <mingo@elte.hu>,
       Islam Amer <pharon@gmail.com>, Pavel Machek <pavel@ucw.cz>,
       Ingo Molnar <mingo@redhat.com>, Andi Kleen <andi@firstfloor.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override
References: <477711DC.5030800@keyaccess.nl>	<alpine.LFD.1.00.0712300124440.32517@woody.linux-foundation.org>	<20071230144700.78f4605c@the-village.bc.nu>	<20071230152835.GX16946@elte.hu>	<20071230153818.1a554a7e@the-village.bc.nu>	<20071230160132.GA14311@elte.hu>	<20071230164828.039916c8@the-village.bc.nu>	<4777E010.7030703@keyaccess.nl>	<20071230183927.5a5a3c42@the-village.bc.nu>	<4777F297.9070207@keyaccess.nl>	<alpine.LFD.1.00.0712301158410.32517@woody.linux-foundation.org>	<47780B93.4050606@reed.com>	<20071230213623.410d480a@the-village.bc.nu>	<4778266B.2060502@reed.com>	<47783678.9070706@zytor.com> <20071231115902.72ab8fe7@the-village.bc.nu>
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Alan Cox wrote:
> On Sun, 30 Dec 2007 16:23:20 -0800
> "H. Peter Anvin" <hpa@zytor.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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