[U-Boot] P4080 target with more than 1 dimm on each ddr3 controller?

Has anyone had any experience with a P4080 target which has more than 1 sodimm slot on each controller? I'm having some difficulties accessing memory on the higher order dimms, but the SPD data are correctly enumerated by the FSL ddr3 code.

Just wondering if this is a known problem before I dig in ...