NAND Boot failed.

Hi, I was trying to copy the uimage from the NAND flash of leopard boarddm355. I tried the commamd <nand read 0x80700000 0x200000 0x200000> then it was showing message as some 2972152 bytes read.. after that again i gave command as <nand write 0x82000000 0x400000 0x900000> ...and i restarted the board, then on the minicom it was showing that BOOTUBLChip initialization passed! TI UBL Version: 1.30 Booting Catalog Boot Loader BootMode = NAND Starting NAND Copy... NAND Boot failed. Starting UART Boot... BOOTUBLStarting UART Boot... BOOTUBLStarting UART Boot... BOOTUBLStarting UART Boot... BOOTUBLStarting UART Boot... BOOTUBLStarting UART Boot... BOOTUBLStarting UART Boot... BOOTUBLStarting UART Boot... Is it overwritten in NAND flash? I am totally confused.I don know what to do? Please can anyone help me?? Thanks

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