Thats the nice thing about DDR though, the DRAM manufacturers understand this and make pinouts quite stable. Micron's 512Mb part and 4Gb have the same pinout and same number of address lines (13). I think this is just a case of the creators of the Galaxy being tied to a single DRAM manufacturer and that manufacturer not producing a 2Gb part.
So next question, when I order my 4Gb sample from Micron, who is doing reasonably priced BGA re-work and where is the bootloader source so that I can modify it?
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