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    SubjectRe: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    Rene Herman wrote:
    >
    > It's really going to have to be a known _un_used register and (the write
    > direction of) port 0x80 is used exactly for that reason. Port 0xed is a
    > known "alternate diagnostic port" used by Phoenix BIOSes at least but
    > Peter Anvin reported trouble with that one -- probably for the outb
    > direction but assuming that means something was in fact responding, we'd
    > have the same timing problem.
    >

    Yes, for the outbound direction.

    > I believe we have two "good" options:
    >
    > 1) port 0xed was tested by the current reporter and found to be safe
    > (and provide slow enough timing). If DMI based quirk hacks are
    > available soon enough we can switch 0x80 to 0xed based on it. Are they?

    DMI is just a data structure parked in memory, so it should at least be
    theoretically possible to get to it.

    -hpa


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