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    From
    SubjectRe: IO delay, port 0x80, and BIOS POST codes
    Date
    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>
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