Custom bootloader jump to application in STM32H7A3

[lbapplem]

hello,

     I use STM32CubeIDE 1.16.0 and working on a custom bootloader to jump to application at address 0x08100000, here're the jump code below:

void jump_to_application(uint32_t flash_address)

{

void (*app_reset_handler)(void);

uint32_t main_stack_pointer_value = *(volatile uint32_t *)flash_address;

__HAL_RCC_GPIOC_CLK_DISABLE();

__HAL_RCC_GPIOD_CLK_DISABLE();

__HAL_RCC_GPIOB_CLK_DISABLE();

__HAL_RCC_GPIOA_CLK_DISABLE();

HAL_RCC_DeInit();

HAL_DeInit();

SysTick->CTRL = 0;

SysTick->LOAD = 0;

SysTick->VAL = 0;

/**

* Step: Disable all interrupts

*/

__disable_irq();

__set_MSP(main_stack_pointer_value);

uint32_t reset_handler = *(volatile uint32_t *)(flash_address + 4);

app_reset_handler = (void*) reset_handler;

app_reset_handler();

}

And I change the ld file of application:

MEMORY

{

ITCMRAM (xrw) : ORIGIN = 0x00000000, LENGTH = 64K

FLASH (rx) : ORIGIN = 0x08100000, LENGTH = 2048K

DTCMRAM1 (xrw) : ORIGIN = 0x20000000, LENGTH = 64K

DTCMRAM2 (xrw) : ORIGIN = 0x20010000, LENGTH = 64K

RAM (xrw) : ORIGIN = 0x24000000, LENGTH = 1024K

RAM_CD (xrw) : ORIGIN = 0x30000000, LENGTH = 128K

RAM_SRD (xrw) : ORIGIN = 0x38000000, LENGTH = 32K

}

And in application, it'll start up with turning on 3 LEDs, each delay by using HAL_Delay(100) like

below:

HAL_GPIO_TogglePin(LED1_GPIO_PORT, LED1_PIN);
HAL_Delay(100);
printf("LED1 on, Delay trail\n");
// HAL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
HAL_Delay(100);
printf("LED2 on, Delay trail\n");
// HAL_GPIO_TogglePin(LED3_GPIO_PORT, LED3_PIN);
HAL_Delay(100);

but I found after jumping to application, only LED1 is turned on, seems stuck in HAL_Delay(if remove HAL_Delay, all LEDs will turn on), can you help me to check if the jump_to_application() is correct? What else do I need to do in application?

Thank you very much!

Bill

[Pavel A. · Accepted solution]

> seems stuck in HAL_Delay(if remove HAL_Delay

Do not forget to assign the vector table base register (VTOR). It must point to the vector table in the app. Align it properly (0x400 for H7)

[Imen.D]

Hello @lbapplem ,

Try configuring the VTOR register as recommended by @Pavel A. 

Please have a look at these FAQs, which may be helpful for you:

• Jump to bootloader from application on STM32H7 dev... - STMicroelectronics Community
• How to jump to system bootloader from application ... - STMicroelectronics Community

[SirineST]

Hello @lbapplem,

It is clear that you have disabled the systick in jump_to_application() function, so, automatically HAL_Delay() will not work, could you please try to re-enable the systick by adding HAL_Init() at the beginning of your application. 

With regards

[lbapplem]

hi,Pavel:

    Thanks, issue resolved.

Bill