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

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Message-ID: <20080108143117.0c594595@lxorguk.ukuu.org.uk>
Date:	Tue, 8 Jan 2008 14:31:17 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bodo Eggert <7eggert@....de>
Cc:	Rene Herman <rene.herman@...access.nl>,
	"H. Peter Anvin" <hpa@...or.com>, Bodo Eggert <7eggert@....de>,
	Christer Weinigel <christer@...nigel.se>,
	Ingo Molnar <mingo@...e.hu>, "David P. Reed" <dpreed@...d.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.

> OTOH, the DOS drivers I heared about use delays and would break on 
> underclocked ISA busses if the n * ISA_HZ delay was needed. Maybe
> somebody having a configurable ISA bus speed and some problematic
> chips can test it ...

I've been looking at DOS reference drivers - they almost all use I/O port
based delays.

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