the first and last cache line in PREREAD, and just invalidate the cache lines in POSTREAD, instead of write-back/invalidating in POSTREAD, which could lead to stale data overriding what has been transfered by DMA.
the first and last cache line in PREREAD, and just invalidate the cache lines in POSTREAD, instead of write-back/invalidating in POSTREAD, which could lead to stale data overriding what has been transfered by DMA.