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    SubjectRe: The latest instance in the A20 farce
    "Dunlap, Randy" wrote:
    >
    > I'm not sure about this, but I'm wondering if the
    > Fixed (as in Static) ACPI Description Table (FADT)
    > can indicate that the platform is a legacy-free system.
    >

    Parsing ACPI is a nightmare on steroids. That is just Not An Option[TM]
    in a < 10K bootstrap routine.

    >
    > > Worse, they define that port 92h, bit 1, is no longer
    > > A20M#... but they
    > > don't forbid the system from using it for other things.
    >
    > I don't quite see it that way. Where do you see that?
    > Maybe it just needs to be more explicit.
    >

    It probably was *intended*, but it isn't *specified*, and in fact some
    manufacturers have been known to abuse this bit.

    > Ch. 3 (SYS-0047) says that port 92h:bit 1 doesn't toggle/affect A20M#.
    > Appendix A says that port 92h is (still?) "System Control Port A"
    > (not defined here AFAIK).
    > (I haven't checked all of the other chapters/appendices.)
    >

    --
    <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
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