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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: setup.S: A20 enable sequence (once again)
Date: 6 Nov 2000 14:06:04 -0800
Organization: Transmeta Corporation, Santa Clara CA
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In-Reply-To: <8u6vn8$70i$1@cesium.transmeta.com> <E13stqG-0006eJ-00@the-village.bc.nu>
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Copyright: Copyright 2000 H. Peter Anvin - All Rights Reserved
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Followup to:  <E13stqG-0006eJ-00@the-village.bc.nu>
By author:    Alan Cox <alan@lxorguk.ukuu.org.uk>
In newsgroup: linux.dev.kernel
>
> > This doesn't really work.  Neither the fast A20 gate nor the KBC is
> > guaranteed to have immediate effect (on most systems they won't.)
> 
> Fast A20 gate happens to be immediate on all the embedded kit I know so its
> probably acceptable, and if its too slow it still does the kbc timeout. Since
> its generally on chip they dont muck about talking to keyboard and other junk
> I/O controllers.
> 

I'd rather do it "right", which is to poll for A20 in the same loop as
we wait for the KBC to become available.

	-hpa

-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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