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STM32F7 Large SDRAM examples? F7-Disco clarification, half of SDRAM accessible

Question asked by campbell.robert on Aug 14, 2016
Latest reply on Aug 14, 2016 by Clive One

I would like to utilize either a 128Mb or 256Mb, and someday, maybe even a 4Gb external SDRAM chip.  If they can just be swapped out on the board all the better.

The F7-DISCO makes a point that due to design considerations only 64Mb is accessible on the 128Mb chip, but does not go into detail on what design change would be required to access the other half of the data.

I can't find any other examples of large SDRAM FMC connection layouts and can't tell if it something like using the 17th data bit or having to use the full 32 bit bus width to get all the data.

Can someone point me to some different configuration examples with different rams and sizes so I can wrap my head around this?