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Date: Tue, 01 Jan 2008 22:42:52 +0100
From: Rene Herman <rene.herman@...access.nl>
To: Christer Weinigel <christer@...nigel.se>
CC: Ingo Molnar <mingo@...e.hu>, Alan Cox <alan@...rguk.ukuu.org.uk>,
"David P. Reed" <dpreed@...d.com>,
"H. Peter Anvin" <hpa@...or.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.
On 01-01-08 22:42, Christer Weinigel wrote:
> The data sheet for the Intel M8259A says:
>
> End of /RD to Next Command: 300 ns
> End of /WR to Next Command: 370 ns
>
> On the other hand, I don't know how all the i8253/i8259 clones or the
> numerous variants of Super I/O chips behave. It wouldn't surprise me
> if some Super I/O chip uses the ISA bus clock to latch the values
> internally so that the delay is dependent on the bus frequency instead.
I wouldn't even be surprised if most all would...
Rene.
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