Hi Marek,

On 10/12/2015 06:32 PM, Marek Vasut wrote:
Wouldn't invalidate_dcache_range() be enough here ? You don't care about the
data in the newly allocated area at this point I guess -- either you fill them
in and then flush, for DMA from CPU to device OR you receive data from device
to CPU and then you invalidate this buffer again.

No. We cannot use invalidate cache here. This is related to cache design of nios2, kind of direct mapped cache.

Best regards,
Thomas
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