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SubjectRe: setup.S: A20 enable sequence (once again)
> This doesn't really work.  Neither the fast A20 gate nor the KBC is
> guaranteed to have immediate effect (on most systems they won't.)

Fast A20 gate happens to be immediate on all the embedded kit I know so its
probably acceptable, and if its too slow it still does the kbc timeout. Since
its generally on chip they dont muck about talking to keyboard and other junk
I/O controllers.

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