Run time Issue with MSP430FR6989 while trying to run / debug source code

Hi,

I am Unable to run source code on msp430fr6989 and stop at main function in IAR workbench, As i can do this with simulator mode but not in FET debugger mode where i try to run it on board.

Problem:

Source code is not working when porting to the development board of "msp430fr6989". It is going to infinite loop at 

ENTRY                                          ADDRESS                  REF BY
=====                                              ======                     ======
__data16_memzero                    F480                          ?cstart_init_zero (?cstart)

could you please let me know what would be the problem?

Observations:

- I can able to run and debug the example projects on launch pad, but if the add API's from my source code it is unable to stop at main function/ debug.

- I tested with calling small function call like "multiplication". It is working fine. I feel there might be a run time memory issue or memory partitioning issue. 

Please help me to solve this.