Re: PCI DMA to small buffers on cache-incoherent arch

Oliver Neukum (Oliver.Neukum@lrz.uni-muenchen.de)
Sun, 9 Jun 2002 08:50:04 +0200

> For memory --> device DMA:
>
> 1. write back all cache lines affected by the DMA
> 2. start the DMA
> 3. invalidate the above cache lines

Why the third step ? That data should still
be valid.

Regards
Oliver
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