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Issue with Serial Flash Utility of DM644x

Hi,

when i try to flash ubl and u-boot through serial flash utility in my custom board, process is stopped as shown in below. pls through some light. Thanks

-----------------------------------------------------
   TI Serial Flasher Host Program for DM644x
   (C) 2009, Texas Instruments, Inc.
   Ver. 1.50
-----------------------------------------------------


Platform is Windows.
Flashing NAND with ubl_DM644x_nand_r37.bin and u-boot_r37.bin.


Attempting to connect to device COM1...
Press any key to end this program at any time.


Waiting for the DM644x...
BOOTME commmand received. Returning ACK and header...
ACK command sent. Waiting for BEGIN command...
        Target:   BEGIN
BEGIN commmand received. Sending CRC table...
 100% [                                                              ]
                           CRC table sent....



Waiting for DONE...
DONE received.  Sending the UBL...
 100% [                                                              ]
                              UBL sent....


DONE received.  UBL was accepted.
UBL transmitted successfully.


Waiting for SFT on the DM644x...
        Target: Starting UART Boot...
        Target: BOOTUBL
BOOTUBL commmand received. Returning CMD and command...
CMD value sent.  Waiting for DONE...
        Target:    DONE
DONE received. Command was accepted.
Sending the UBL image
Waiting for SENDIMG sequence...
SENDIMG received. Returning ACK and header for image data...
ACK command sent. Waiting for BEGIN command...
BEGIN commmand received.
 100% [                                                              ]
                           Image data sent...


Waiting for DONE...
DONE received.  All bytes of image data received...