[U-Boot] MPC8313 with big sdram

[illeggy]

u-boot-1.1.6.

my sdram is 512MB, with CS0_BNDS,DDRLAWAR0,DDRLAWBAR0 modified, 256MB of
512MB sdram can work perfectly.

Then, I defined CONFIG_VERY_BIG_RAM, 512MB can be recognized, but, I can
only read and write 256MB, fault occurred when address move across 256MB.

besides CONFIG_VERY_BIG_RAM, what else should I do to support big sdram?
Thanks!
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