Date: Tue, 1 Jan 2008 21:13:22 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Christer Weinigel <christer@weinigel.se>
Cc: Ingo Molnar <mingo@elte.hu>, "David P. Reed" <dpreed@reed.com>,
       "H. Peter Anvin" <hpa@zytor.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.
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> How do you find out the speed of the ISA bus?  AFAIK there is no
> standardized way to do that.  On the Geode SC2200 the ISA bus speed is

It is per chipset magic registers. Fun fun fun

> usually the PCI clock divided by 4 giving 33MHz/4=8.3MHz or
> 30/4=7.5MHz, but with no external ISA devices it's possible to
> overclock the ISA bus to /3 to run it at 11MHz or so.  But without

12MHz is valid for ISA although not a good idea - even IBM issued some
systems with 12MHz ISA before discovering many vendors had assumed 8 was
it.
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