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AM3715 cannot boot from NAND

We are using Window Embedded Compact 7.0, here is the situation;

1) The CPU cannot be boot successfully from NAND Flash.
2) It can boot up successfully from SD card and we confirm the we can 
read/write the Flash correctly after boot up.
3) We tried to use UART boot to write the OMAP35xx-nand.raw to the Nand 
Flash. After that, we used SD card to boot up the device and confirmed 
that the Eboot has been written to NAND Flash correctly, but just it 
cannot be booted from NAND if we remove the SD card.
4) We tried almost every boot configurations which have NAND boot inside.
5) We used MCP for the NAND Flash and DDR. We've tried two models:
KAL00O015M-B3TT of Samsung and MT29C4G48MAAHBAAKS- 5 WT of Micron and
both of them behave the same.