Message-ID: <4782A355.1070207@zytor.com>
Date: Mon, 07 Jan 2008 14:10:29 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Bodo Eggert <7eggert@gmx.de>
CC: Christer Weinigel <christer@weinigel.se>, Ingo Molnar <mingo@elte.hu>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, "David P. Reed" <dpreed@reed.com>,
       Rene Herman <rene.herman@gmail.com>, Paul Rolland <rol@as2917.net>,
       Pavel Machek <pavel@ucw.cz>, Thomas Gleixner <tglx@linutronix.de>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
       rol@witbe.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
References: <9BdU5-1YW-9@gated-at.bofh.it> <9BeZN-3Gf-5@gated-at.bofh.it> <9BnTB-1As-31@gated-at.bofh.it> <9BrX4-8go-1@gated-at.bofh.it> <9BuBG-4eR-51@gated-at.bofh.it> <9BvRd-6aL-71@gated-at.bofh.it> <9GRQW-1DX-13@gated-at.bofh.it> <9GSah-23W-1@gated-at.bofh.it> <9GSDy-2GD-23@gated-at.bofh.it> <9GTpK-40d-15@gated-at.bofh.it> <9GUvy-5H2-11@gated-at.bofh.it> <9GVKU-7SS-25@gated-at.bofh.it> <E1JBxnV-00046d-CS@be1.7eggert.dyndns.org> <478281A6.1000704@zytor.com> <alpine.LSU.0.999.0801072226060.16143@be1.lrz>
In-Reply-To: <alpine.LSU.0.999.0801072226060.16143@be1.lrz>
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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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