stm32f0 iap 进入app函数用了一分钟！谁遇到过

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stm32f0    iap 进入app函数用了一分钟！谁遇到过？

• int main(void)  
• {  
•   uint32_t i = 0;  
•   
•   /*!< At this stage the microcontroller clock setting is already configured,  
•        this is done through SystemInit() function which is called from startup
•        file (startup_stm32f0xx.s) before to branch to application main.
•        To reconfigure the default setting of SystemInit() function, refer to
•        system_stm32f0xx.c file
•      */   
•   
• /* Relocate by software the vector table to the internal SRAM at 0x20000000 ***/   
•   
•   /* Copy the vector table from the Flash (mapped at the base of the application
•      load address 0x08003000) to the base address of the SRAM at 0x20000000. */  
•   for(i = 0; i < 48; i++)  
•   {  
•     VectorTable = *(__IO uint32_t*)(APPLICATION_ADDRESS + (i<<2));  
•   }  
•   
•   /* Enable the SYSCFG peripheral clock*/  
•   //RCC_APB2PeriphResetCmd(RCC_APB2Periph_SYSCFG, ENABLE);   
•   RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);    //需要修改成这样  
•   /* Remap SRAM at 0x00000000 */  
•   SYSCFG_MemoryRemapConfig(SYSCFG_MemoryRemap_SRAM);  
•   
• /...  
• }