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

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Message-ID: <478781F1.8040406@keyaccess.nl>
Date:	Fri, 11 Jan 2008 15:49:21 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	"David P. Reed" <dpreed@...d.com>
CC:	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.

On 11-01-08 15:35, David P. Reed wrote:

> Rene Herman wrote:
>> On 11-01-08 02:36, Zachary Amsden wrote:
>>
>>> FWIW, I fixed the problem locally by recompiling, changing port 80 to 
>>> port 84 in io.h; works great, and doesn't conflict with any occupied 
>>> ports.
>>
>> Might not give you a "proper" delay though. 0xed should be a better 
>> choice...
>>
> I don't think there is any magic here.

Golly, you don't think so? Just commenting on his local hack. Port 0x84 is 
inside the (reserved) DMA page register range and stands a better chance of 
not being echoed onto ISA by various chipsets than 0xed does due to that.

Yes -- on a sane machine it's all useless anyway and with all sane machines 
this discussion would've ended quite some time ago already. It's the insane, 
obsolete legacy junk that's the problem.

Rene.
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