just by looking at part of code i see a hangup:  void Flash_Read_Data (uint32_t StartPageAddress, uint32_t *RxBuf, uint16_t numberofwords) { while (1) 

based on previous info: for stm32f7 this seams like it would do the trick. static void flush_caches(void){SCB_EnableICache(); //Invalidate and then enable the instruction cache SCB_EnableDCache(); //Invalidate and then enable the data cache}

For stm32f7:Information i have to go by on is: HAL_StatusTypeDef HAL_Init (void )This function is used to initialize the HAL Library; it must be the first instruction to be executed in the main program (before to call any other HAL function), it perf...

For dual bank information you can use this resource:STM32F7 Series Flash memory dual bank mode, software expansion for STM32Cube (AN4826)