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SubjectRe: IO delay, port 0x80, and BIOS POST codes
On 14 Mar 2002, H. Peter Anvin wrote:

> Date: 14 Mar 2002 13:57:40 -0800
> From: H. Peter Anvin <hpa@zytor.com>
> To: linux-kernel@vger.kernel.org
> Subject: Re: IO delay, port 0x80, and BIOS POST codes
>
> Followup to: <Pine.LNX.4.33.0203141318130.9855-100000@penguin.transmeta.com>
> By author: Linus Torvalds <torvalds@transmeta.com>
> In newsgroup: linux.dev.kernel
> >
> > Port ED is fine for a BIOS, which (by definition) knows what the
> > motherboard devices are, and thus knows that ED cannot be used by
> > anything.
> >
> > But it _is_ an unused port, and that's exactly the kind of thing that
> > might be used sometime in the future. Remember the port 22/23 brouhaha
> > with Cyrix using it for their stuff, and later Intel getting into the fray
> > too?
> >
> > So the fact that ED works doesn't mean that _stays_ working.
> >
>
> It is, in fact, broken on several systems -- I tried ED in SYSLINUX
> for a while, and it broke things for people.

It does work on many, in fact, we used on a Crusoe based platform
as well as the other x86s

Let's make it a configurable kernel debug/hacking option else
we have the added burden of chasing down a common address.

Johnh

>
> -hpa
> --
> <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
> "Unix gives you enough rope to shoot yourself in the foot."
> http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
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