On Fri, Aug 07, 2009 at 02:07:43PM +0200, Laurent Desnogues wrote: > On Fri, Aug 7, 2009 at 11:54 AM, Jamie Lokier<jamie@xxxxxxxxxxxxx> wrote: > > > > 1. Does the architecture not prevent speculative instruction > > prefetches from crossing a page boundary? It would be handy under the > > circumstances. > > There's no such restriction in ARMv7 architecture. Doesn't it prevent them for uncached areas? I _THOUGHT_ there was an alloc_consistent (or something like that) call on ARM which gave you an uncached mapping where you could do DMA. I also thought there was a dma_* set of functions which remapped as uncached before DMA begins and remapped as normal after DMA has been completed. Sorry for the fuzzy recollection. I am dredging from 2.6.21 timeframe. Robin -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
