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

From: H. Peter Anvin (hpa@zytor.com)
Date: Thu Mar 14 2002 - 16:57:40 EST


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.

        -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>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Fri Mar 15 2002 - 22:00:19 EST