My rk2918 specs :
av-017 kxi
nand flash 32 gb but 4gb only usable
ram 4gb ddr3-1333 but 256mb only usable.
Also I had new problem for this nand flash goes to 2gb only and always flashing experience IDB failed and flashing error.
If flashing successfully goes to black screen.
Mean time I upload the custom gingerbread firmware.
Pass at second attachment.