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Serial flasher utility string error

Hi Folk,

I use serial flasher precompiled utility to flash ubl and uboot to nand on Dm365 board.

I have a source code of serial flasher utility. When I compile and try to flash nand then below error occurrs.

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   TI Serial Flasher Host Program for DM36x
   (C) 2014, Texas Instruments, Inc.
   Ver. 1.50
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Globally erasing NAND flash.


Attempting to connect to device COM4...
Press any key to end this program at any time.

String cannot have zero length.


Interfacing to the DM36x via UART failed.
Please reset or power-cycle the board and try again...

F:\MAIN\TEMP\Firmware_Binaries>

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Please let me know how to resolve it.

Regards,

Amit