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Writting to TMS320c6748 LCDK NAND

Hello, first of all I want to thank you for the fast response on my other question, worked like a charm. Now that I finished my program, I want to write it at the NAND memory. I followed the steps in the wiki page of the board (L138/C6748 Development Kit), generated the .bin of my .out and flashed it using the sfh tool in the CMD (switches are [1:4] 0101 UART mode). After all it's done, I receive the message "Operation completed successfully." and I change the switch to the NAND boot mode ([1:4] 0111) but my program doesn't start (I turn a led off at the beginning, but it stay on).  Since it failed, I tryed to write another program to the NAND memory (the gpio from the example, a little bit modified) and it worked. What could be wrong? Since one project worked and the other one doesn't.

Obs: If I send the .out directly using the CCS, the program runs ok, but it's written at the DDR2 memory.