>Is it possible to execute code out of NAND FLASH at all?  They can't be
>randomly accessed like RAM or conventional FLASH, at least.

There are newer technologies like OneNAND which allow a somewhat esoteric 
XIP. Conventional SLC and MLC do not since they are serially accessed, and I 
think considering these to be the common case is a good idea as the price 
difference is substantial and in favor of the latter.

Jared