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DFU Bootloader cannot jump to application

Hi All,

I am using STR912FAW44 and keil MDK to develop the DFU bootloader. When the program jumps to Application, it hangs there. I set up a breakpoint before jump, I find it always goes to undefined handler. I wonder what causes to go to the undefined handler. Greatly appreciate any suggestions.

    FMI->BBSR   = 0x0;
    FMI->NBBSR  = 0x6;
    FMI->BBADR  = 0x400000 >> 2;
    FMI->NBBADR = 0x0 ;
    /* Jump to the user application and execute it */
    Jump_To_Application = (pFunction) 0x00;

    Jump_To_Application();   (set breakpoint here)

Best Regards,

Lillian