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

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Date:	Mon, 17 Dec 2007 03:19:28 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>, Paul Rolland <rol@...917.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@....cz>, "David P. Reed" <dpreed@...d.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

On 17-12-07 03:05, H. Peter Anvin wrote:

> Incidentally, I had the thought earlier today that port 0xf0 might be a 
> suitable delay port.  It is used only by the 387-emulating-a-287 hack 
> for IRQ 13, which Linux doesn't use on 486+.

rene@...e4:~/src/port80$ su -c ./port80
cycles: out 2400, in 2400
rene@...e4:~/src/port80$ su -c ./portf0
cycles: out 2400, in 2400

(Duron 1300)

I suppose you mean using it instead of port 0x80 always and not just as an 
alternate port? For the latter 0xed is alright I guess...


Rene.
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