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    SubjectRe: Flushing writes to PCI devices
        Bryan> Yes.  If your device requires that writes to some locations
    Bryan> in MMIO space be performed in a specific order, you must
    Bryan> explicitly do this in your driver. Intel CPUs will flush
    Bryan> posted writes out of order, for example.

    Really? Just normal posted PCI writes without using MTRRs or
    write-combining or anything like that?

    That doesn't seem right to me, and I would expect all sorts of things
    to break if it were true.

    - R.
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