Re: IO delay, port 0x80, and BIOS POST codes

[John Heil]

On 14 Mar 2002, H. Peter Anvin wrote:

> Date: 14 Mar 2002 13:57:40 -0800
> From: H. Peter Anvin <[e-mail]>
> To: [e-mail]
> Subject: Re: IO delay, port 0x80, and BIOS POST codes
>
> Followup to:  <[e-mail]>
> By author:    Linus Torvalds <[e-mail]>
> 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
> --
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John Heil
South Coast Software
Custom systems software for UNIX and IBM MVS mainframes
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