I have the same issue with the S905X 1G-ram/8G.
8.0 builds install to nand without issue, 8.2 builds cant find the system partition
Tried the dtb from 8.0, gxl_p212_1g_nand.dtb , and various others
Ofcourse right after posting I manage to get gxl_p212_1g.dtb to work.