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

From: David S. Miller (
Date: Sun Jun 09 2002 - 00:29:42 EST

   From: "Albert D. Cahalan" <>
   Date: Sat, 8 Jun 2002 21:30:31 -0400 (EDT)
   On a non-SMP system, would it be OK to map all the memory
   without memory coherency enabled? You seem to be implying that
   one only needs to implement some mechanism in pci_map_single()
   to handle flushing cache lines (write back, then invalidate).
   This would be useful for Macs.
It's just avoiding flushing by effecting flushing the cache after
every load/store the cpu does, so of course it would work.

It would be slow as hell, but it would work.
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