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Prefetch and write post engine

Hi, 

I'm working on ti am335x custom board, and now I  just want to know what definition of Prefetch and write post engine.

Is it only use when the nand is DMA mode?

Because, source code already set use prefetch mode as a default.

Please explain exact definition of Prefetch and write post engine, how can i use it?

Best regards,

Wonjae