task doesn't start when run in ram

[lbapplem]

hello:

    I use NUCLEO-H7A3ZI-Q to test a bootloader feature:the bootloader runs in 0x08000000 at flash, when it starts, it copies the application stored in 0x08005000 to 0x24000000 in RAM, then jump to 0x24000000, I turn on a led in main function to signal the success, so far it works well, but if I put the turn on code in a task, the led won't be turned on, which means the task fails to run, also if I use HAL_Delay in main, it will be stuck in HAL_Delay, can anyone help me out? Thanks.

Bill

[Tesla DeLorean]

Not sure with the level of detail provided.

Make sure SCB->VTOR points to a vector table you've placed at 0x24000000 and those vectors point to the right routines and the right addresses.

[SofLit · Accepted solution]

Hello @lbapplem ,

Based on the statement below it's mostly related to the vector table that was not inline with your new mapping as it's a code execution from RAM:

---

@lbapplem wrote:

if I use HAL_Delay in main, it will be stuck in HAL_Delay, 

---

HAL_Delay is using system tick interrupt and the vector table start address is wongly set.

Look for example at system_stm32h7xx.c file, the vector table start address register (VTOR) has different values according to the location:

  /* Configure the Vector Table location add offset address ------------------*/
#ifdef VECT_TAB_SRAM
  SCB->VTOR = D1_AXISRAM_BASE  | VECT_TAB_OFFSET;       /* Vector Table Relocation in Internal SRAM */
#else
  SCB->VTOR = FLASH_BANK1_BASE | VECT_TAB_OFFSET;       /* Vector Table Relocation in Internal FLASH */
#endif  

[lbapplem]

hi, SofLit:

    I've tried according to your suggestion by adding SCB->VTOR = 0x24000000 in main function of application, then if I use STM32CubeIDE 1.16.0 to run in debug mode, all LEDs will turn on which indicate the task run normally, but if I use bootloader to copy the application from flash to ram, still the same result, and the code in bootloader is below, can you help to check if anything I missed here? Thanks.

void JumpToApplication(uint32_t jump_address)

{

void (*app_reset_handler)(void);

uint32_t main_stack_pointer_value = *(volatile uint32_t *)jump_address;

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

app_reset_handler = (void*) reset_handler;

/**

* Step: Disable all interrupts

*/

__disable_irq();

HAL_RCC_DeInit();

HAL_DeInit();

SysTick->CTRL = 0;

SysTick->LOAD = 0;

SysTick->VAL = 0;

SCB->VTOR = jump_address;

/**

* Step: Enable all interrupts

*/

__enable_irq();

__set_MSP(main_stack_pointer_value);

app_reset_handler();

}

void Copy2RamJump(void)

{

uint32_t app_addr = APP_START_ADDR;

uint32_t ram_exec_addr = RAM_EXECUTION_ADDRESS;

uint8_t* size_ptr = (uint8_t*)app_addr;

//the first 4 bytes is the size of executive image exclude 4 bytes CRC and the size itself

uint32_t size = (size_ptr[0] | (uint32_t)size_ptr[1] << 8 | (uint32_t)size_ptr[2] << 16 | (uint32_t)size_ptr[3] << 24) / 4 + 1;

uint32_t *flash_ptr = (uint32_t *)(app_addr + 4);//skip first 4 bytes which is size

uint32_t *ram_ptr = (uint32_t *)ram_exec_addr;

for (uint32_t i = 0; i < size; i++)

{

ram_ptr[i] = flash_ptr[i];

}

// Jump to RAM execution address

JumpToApplication(ram_exec_addr);

}

Bill