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From: Alan Cox <alan@redhat.com>
Message-Id: <200012061301.eB6D17B08279@devserv.devel.redhat.com>
Subject: Re: That horrible hack from hell called A20
To: cate@student.ethz.ch (Giacomo Catenazzi)
Date: Wed, 6 Dec 2000 08:01:06 -0500 (EST)
Cc: hpa@transmeta.com (H. Peter Anvin),
        torvalds@transmeta.com (Linus Torvalds),
        linux-kernel@vger.kernel.org (Linux Kernel Mailing List),
        alan@redhat.com (Alan Cox)
In-Reply-To: <3A2E345C.EE6F5640@student.ethz.ch> from "Giacomo Catenazzi" at Dec 06, 2000 01:43:08 PM
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> INT 15-2401 disable A20
> INT 15-2402 query status A20
> INT 15-2403 query A20 support (kdb or port 92)
> 
> IBM classifies these functions as optional, but it is enabled on a lot
> of
> new BIOS, no know conflicts, thus we can call this function to enable
> A20,
> check the result and only after failure we can try the old methods.

I trust Linus over BIOS vendors, every single time. 

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