Re: Flushing writes to PCI devices

Bryan O'Sullivan
2006-09-21T18:11:31Z

On Wed, 2006-09-20 at 12:41 -0700, Bill Waddington wrote:

> Are there ever any issues with out-of-order writes from the posting
> buffer on supported architectures?

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

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