sdram transfer

Be warned, though, that this meaning for bit 31 is optional and may be turned off. The only way to avoid the cache that is guaranteed to work for all Nios II cores is to use ldio/stio instructions instead of ld/st. The io suffix treats the read/write like a device access, so it avoids the cache as repeated reads/writes to device registers are often important. Perhaps there is a specialised memcpy that uses these instructions?