Hi Albert,

On 10/19/2015 01:52 PM, Albert ARIBAUD wrote:
Not sure I'm getting this, so for my own education: what prevents from
invalidating the cache, or IOW, what would happen if it was invalidated
at this point rather than flushed?

This is a hardware limitation. The nios2 cpu with 4 bytes dcache line size does not support the initda instruction, which is needed to invalidate dcache.

Recently we added a check, if the nios2 cpu support initda instruction, then we use invalidate_dcache, otherwise we use flush_dcache.

Best regards,
Thomas
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