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

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Message-ID: <478BE08B.3090306@reed.com>
Date:	Mon, 14 Jan 2008 17:22:03 -0500
From:	"David P. Reed" <dpreed@...d.com>
To:	David Woodhouse <dwmw2@...radead.org>
CC:	Rene Herman <rene.herman@...access.nl>,
	Zachary Amsden <zach@...are.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christer Weinigel <christer@...nigel.se>,
	Ondrej Zary <linux@...nbow-software.org>,
	Bodo Eggert <7eggert@....de>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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 <rol@...be.net>
Subject: Re: Re: [PATCH] x86: provide a DMI based port 0x80
 I/O delay override.

David Woodhouse wrote:
> On Fri, 2008-01-11 at 09:35 -0500, David P. Reed wrote:
>   
>>   Using any "unused port" for a delay means that the machine check
>> feature is wasted and utterly unusable.
>>     
>
> Not entirely unusable. You can recover silently from the machine check
> if it was one of the known accesses to the 'unused port'. It certainly
> achieves a delay :)
>   
I'm sure that's what the driver writers had in mind.  ;-)

And I think we probably have a great shot at getting Intel, Microsoft, 
HP, et al.. to add a feature for Linux to one of the ACPI table 
specifications that define an "unused port for delay purposes" field in 
the ACPI 4.0 spec, and retrofit it into PC/104 machine BIOSes.  At least 
Microsoft doesn't have a patent on using port 80 for delay purposes. :-)




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