Re: PowerPC PCI DMA issues (prefetch/coherency?)
From: Scott Wood
Date: Tue Jun 16 2009 - 13:49:16 EST
Arnd Bergmann wrote:
On Tuesday 16 June 2009, Scott Wood wrote:
Chris Pringle wrote:
Ah right - that would explain what we're seeing then... Doh. Thought I
might have been onto something then. Is there any way to force a cache
flush? That'd at least prove it was a caching issue if it resolved the
You could enable CONFIG_NOT_COHERENT_CACHE.
If the whole system is noncoherent, that is the right solution.
I meant it more as a test than a permanent solution...
device is the only one, you can also use dma_alloc_noncoherent() and
flush explicitly with dma_cache_sync().
I don't see how that would help -- aren't those also controlled by
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/