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

Oliver Neukum
2002-06-09T06:50:16Z

> 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