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    SubjectRe: That horrible hack from hell called A20


    On Wed, 6 Dec 2000, Kai Germaschewski wrote:

    >
    > On Tue, 5 Dec 2000, H. Peter Anvin wrote:
    >
    > > If you have had A20M# problems with any kernel -- recent or not --
    > > *please* try this patch, against 2.4.0-test12-pre5:
    >
    > Just a datapoint: This patch doesn't fix the problem here (Sony
    > PCG-Z600NE). Still the spontaneous reboot exactly the moment I expect to
    > get my console back from resumeing.

    Actually, I bet I know what's up.

    Want to bet $5 USD that suspend/resume saves the keyboard A20 state, but
    does NOT save the fast-A20 gate information?

    So anything that enables A20 with only the fast A20 gate will find that
    A20 is disabled again on resume.

    Which would make Linux _really_ unhappy, needless to say. Instant death in
    the form of a triple fault (all of the Linux kernel code is in the 1-2MB
    area, which would be invisible), resulting in an instant reboot.

    Peter, we definitely need to do the keyboard A20, even if fast-A20 works
    fine.

    Linus

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