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

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Message-ID: <4782A355.1070207@zytor.com>
Date:	Mon, 07 Jan 2008 14:10:29 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bodo Eggert <7eggert@....de>
CC:	Christer Weinigel <christer@...nigel.se>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>,
	Rene Herman <rene.herman@...il.com>,
	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@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

Bodo Eggert wrote:
> 
> But overclocking is not the problem for udelay, it would err to the safe 
> side. The problem would be a BUS having < 8 MHz, and since the days of 
> 80286, they are hard to find. IMO having an option to set the bus speed
> for those systems should be enough.
> 

There might have been a few 386/20's clocking the ISA bus at ÷3
(6.67 MHz) rather than ÷2 (10 MHz) or ÷2.5 (8 MHz).

	-hpa
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