CCS/TMS320F28335: Branch into SCI boot from flash program

Part Number: TMS320F28335

Tool/software: Code Composer Studio

Hello !

I try branch into SCI boot from flash program.I see bootrom.map   (003ff633   _SCI_Boot) I write some code but I get errors.What I can make? 

extern Uint32 SCI_Boot();

void main(void)
{
    //(void (*)(void))0x003ff633;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.

    unsigned long boot_addr = 0x003FF633;
    //(void (*)(void))0x003ff63c


   InitSysCtrl();

   IER = 0x0000;
   IFR = 0x0000;
   // Initialize PIE control registers to their default state.
   // The default state is all PIE interrupts disabled and flags
   // are cleared.
   // This function is found in the DSP2833x_PieCtrl.c file.
   InitPieCtrl();
// Step 3. Clear all interrupts and initialize PIE vector table:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
// Disable CPU interrupts
   DINT;
   void (*entry)();

   entry = (void(*)())(boot_addr);

   entry();

   entry = (void(*)())(boot_addr);

   SCI_Boot();

   Gpio_select();