The SanDisk iNAND seems to be integrated data storage for the Linux OS (flash), but it also seems to be volatile RAM according to the brochure. So, maybe the main memory (256MB) is here.
But then,
what does the SAMSUNG K4X2G323PB-8GC3 do? I assume it's a memory chip and although the datasheet is not available, it could be 2GB volatile RAM.
http://www.chipworks.com/en/technica...ent-teardowns/