To get into 4GB for iMx, it seems like it will need a 4 8Gbit x16 DRAM. An 8Gbit(x16) requires 2 chip selects. But in the schematics there is only one chip select routed to the DRAMs.
What is the strategy iMX6Rex implemented in order to support 4GB?
Just use Address A15 e.g. have a look here: http://www.intelligentmemory.com/fileadmin/pdf-datasheets/IM8G16D3EBBG-Rev02-0212.pdf Hope it helps.
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