When the program is downloaded to flash, SCI can't work properly

I met a strange issue：

When online debugging,28069 SCI communication is normal.

 When the program is downloaded to the chip flash, SCI is not working properly.

The following is the SCI initialization code：

void HAL_setupSciB(HAL_Handle handle)
{
	HAL_Obj   *obj = (HAL_Obj *)handle;

	SCI_setMode(obj->sciBHandle,SCI_Mode_IdleLine);            
	SCI_setCharLength(obj->sciBHandle,SCI_CharLength_8_Bits);  
	SCI_setNumStopBits(obj->sciBHandle,SCI_NumStopBits_One);   
	SCI_setParity(obj->sciBHandle, SCI_Parity_Odd);
	SCI_disableParity(obj->sciBHandle);                       
	SCI_disableLoopBack(obj->sciBHandle);                     

	SCI_disableRxErrorInt(obj->sciBHandle);                    
	SCI_disable(obj->sciBHandle);
	SCI_disableTxWake(obj->sciBHandle);                       
	SCI_disableSleep(obj->sciBHandle);                         
	SCI_enableTx(obj->sciBHandle);                            
	SCI_enableRx(obj->sciBHandle);                             

	SCI_setBaudRate(obj->sciBHandle,SCI_BaudRate_9_6_kBaud); 
	SCI_clearRxFifoInt(obj->sciBHandle);                      
	SCI_enableRxInt(obj->sciBHandle);                        
	SCI_enableTxInt(obj->sciBHandle);                     
	SCI_enable(obj->sciBHandle);

	SCI_resetRxFifo(obj->sciBHandle);
	SCI_resetTxFifo(obj->sciBHandle);
	return;
}  // end of HAL_setupSciB() function

GPIO_setMode(obj->gpioHandle,GPIO_Number_40,GPIO_40_Mode_SCITXDB);


GPIO_setMode(obj->gpioHandle,GPIO_Number_41,GPIO_41_Mode_SCIRXDB);

//! \brief Defines the base address of the serial communications interface (SCI) B registers
//!
#define SCIB_BASE_ADDR              (0x00007750)
	
// initialize the SCIB handle
obj->sciBHandle = SCI_init((void *)SCIB_BASE_ADDR,sizeof(SCI_Obj));