In the EVK design have 1 DDR3 DRAM chip which is DDR3-1600. However, the datasheet of iMX6ULL says it only support DDR3-800, which means the bus frequency can only be 400Mhz. I am not sure how to use a higher speed memory with a lower speed CPU. When write data, that may be OK. But when read data, the data strobe is sent by DDR3-1600, which should be 800Mhz. How does it work with iMX6ULL 400Mhz bus frequency?
