Custom bootloader doesn't jump to app

[SBaro.11]

Hi all,

I'm trying to create a custom bootloader with openbl on rak3172 sip buil with stm32wl, so Ive used this repos here. I've just ipdate the main like this

#define APP_ADDRESS      0x08008000U


  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_RTC_ENABLE();
  init_led();

  if(get_bootloader_flag() == BOOTLOADER_MAGIC){

	  set_led_bootloader();


	  OpenBootloader_Init();

	  while (1)
	  {
		OpenBootloader_ProtocolDetection();
	  }
  }else{
	  set_led();
	  jump_to_app(APP_ADDRESS);
  }

void jump_to_app(uint32_t address)
{
	uint32_t i=0;
	void (*SysMemBootJump)(void);
	__disable_irq();

	/* Disable Systick timer */
	SysTick->CTRL = 0;

	/* Set the clock to the default state */
	HAL_RCC_DeInit();

	/* Clear Interrupt Enable Register & Interrupt Pending Register */
	for (i=0;i<5;i++)
	{
		NVIC->ICER[i]=0xFFFFFFFF;
		NVIC->ICPR[i]=0xFFFFFFFF;
	}

	/* Re-enable all interrupts */
	__enable_irq();

	/* Set up the jump to boot loader address + 4 */
	SysMemBootJump = (void (*)(void)) (*((uint32_t *) ((APP_ADDRESS + 4))));

	/* Set the main stack pointer to the boot loader stack */
	__set_MSP(*(uint32_t *)APP_ADDRESS);

	/* Call the function to jump to boot loader location */
	SysMemBootJump();
}

I check if I have a flag, if not jump to app. I flash bootloader with cube programmer, and after thaht I flash my app also with cube programmer at 0x08008000, to confirm I read flash with cube programmer and I'm able to see data at  0x08000000 and 0x08008000.

My linker script for my app

MEMORY
{
  RAM    (xrw)   : ORIGIN = 0x20000000, LENGTH = 64K
  RAM2   (xrw)   : ORIGIN = 0x10000000, LENGTH = 32K
  FLASH   (rx)   : ORIGIN = 0x08008000, LENGTH = 256K - 0x8000
}

and system_stm32wlxx.c file

#define USER_VECT_TAB_ADDRESS
#define VECT_TAB_BASE_ADDRESS   FLASH_BASE 
#define VECT_TAB_OFFSET         0x00008000U

void SystemInit(void)
{
#if defined(USER_VECT_TAB_ADDRESS)
  /* Configure the Vector Table location add offset address ------------------*/
  SCB->VTOR = VECT_TAB_BASE_ADDRESS | VECT_TAB_OFFSET;
#endif

  /* FPU settings ------------------------------------------------------------*/
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
  SCB->CPACR |= ((3UL << (10UL*2UL))|(3UL << (11UL*2UL)));  /* set CP10 and CP11 Full Access */
#endif
}

I can see my led set in my case with set_led(), but my bootloader doesn't jump to my app. What I missed?

EDIT: ok so if I comment __enable_irq() in jump_to_app() I'm able to see the begining f my app with UART, but app stuck at first Hal_Delay... If I uncomment __enable_irq() my app never start... What happen ?

[Imen.D]

Hello @SBaro.11 ,

This tutorial, will help you to easily jump from application code: How to jump to system bootloader from application code on STM32 microcontrollers

[SBaro.11]

Hello @Imen.D 
I've followed this tutorial for jumping to my app just changing addr by my app starting adr but doesn't work, my custom bootloader never jump to my app

[LCE]

Have you de-initialised all peripherals?

Why enable interrupts before jumping?
Just checked my working H7 jump code, I thought I disable interrupts before jumping, but I don't. 

EDIT: just tested with __disable_irq() before jump -> jump either fails, or app does not start correctly

[SBaro.11]

Hi @LCE ,

jump_to_app is a function coming from ST How to jump to system bootloader from application code on STM32 microcontrollers 

I've just try to comment __enable_irq() if I do thaht, my app start but stuck at the first Hal_delay() function. If I leave __enable_irq() my app never start from bootloader...

[Tesla DeLorean]

You'll want to double check what's going on in the NVIC, that SCB->VTOR is set correctly, and that the vectors in the vector table point to the correct functions.

Would strongly recommend getting some diagnostic instrumentation working, and that Error_Handler and HardFault_Handler and perhaps Default_Handler output some kind of information or illuminate different LEDs or GPIO.

Check the SysTick system handler is correctly configured, and that you don't have a mess of other PHYSICAL interrupts enabled, and pointing to handlers, with uninitialized peripheral structure/instances.

[SBaro.11]

Hello @Tesla DeLorean ,

I've just check VTOR in my app after jump and seems to be good:
VTOR=0x08008000, Reset_Handler=0x08009F61

 I've also add print in HardFault_Handler, Default_Handler, and Error_Handler in my app nothing print.

If I flash my app with cube programmer at 0x08008000 my app boot and works well, but if I pass by my custom bootloader, I'm stuck in first Hal_Delay.

I don't understand why if I let __enable_irq() in by jump function (as recommend by ST) my app never start