Nios II - Data cache problem

You'll need to do something to either flush the data from the cache, or to do uncached accesses.

uClinux ought to have functions to map the memeory uncached.

You also need to ensure that you NEVER access any physical address in the same cache line via cachable accesses. The cache line read/write will have unwanted effects.

For a hardware device this is unlikely, but can be a problem is you want a block of memory (eg for dma).