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AM335x GPMC not bursting all the way

We're trying to get GPMC burst mode to work under linux with the logibone driver. When we probe the bus with a logic analyzer, we find that:

  • With DMA, all we get is 16x2 bursts.
  • If we replace the DMA with memcpy(), we get 16x4 bursts.

We're looking to get 16x16 bursts. How can we go about achieving that?