At 11:26 AM 9/25/2003, Roland Dreier wrote: >People often come up with complicated schemes like flushing and >invalidating the cache before and after the DMA transfer, but there's >always a scenario where the DMA buffer and/or the unrelated data get >corrupted. The only solution is to make sure that you don't put >unrelated data in the same cache line as a DMA buffer.
Well, I'm one of those strange people. Actually, those schemes are quite trivial and they help in _real_ life. I fully understand that they are not 100% foolproof, but I think they are _better_ than doing _nothing_. I already _wasted_ a lot of my time debugging cache coherency problems. I cannot audit _all_ drivers/subsystems I use nor I can force their authors do this. Eugene. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
