How to support 1GB ram size in WINCE 6.0

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I attempt to support 1GB ram size in wince 6.0
I've modified _dwOEMTotalRAM in the startup.asm as following:

_dwOEMTotalRAM:
;dd 04000000h
dd 40000000h

and chagne the value CEPC_EXTRA_RAM_SIZE in PC.h to 0x3E400000

but it always failed to boot up.
Anything more I should modify?
Appreciate advanced.
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