Custom Bootloader - Not able to jump on the specific location on flash

[shubmane]

Hi team,

We are working on the custom bootloader on stm32u073RC. not able to jump on the specific location.

#define APPLICATION_PARTITION_1     0x0801D000


void jump_to_application_partition_1(void)
{
    /* Disable Interrupts */
    __disable_irq();

    /* Get the stack pointer and reset vector from the backup application section */
    uint32_t app_stack_pointer_1 = *(volatile uint32_t *) APPLICATION_PARTITION_1;
    uint32_t app_reset_vector_1 = *(volatile uint32_t *) (APPLICATION_PARTITION_1 + 4);

    /* Mapping of the backup application reset vector */
    pfunction app_entry_1 = (pfunction) app_reset_vector_1;

    /* Setting of the vector table to backup application */
    SCB->VTOR = APPLICATION_PARTITION_1;

    /* Setting MSP - (Main Stack Pointer) */
    __set_MSP(app_stack_pointer_1);

    /* Enable Interrupts */
    __enable_irq();

    /* Jump to backup application */
    app_entry_1();
}

 Thanks,

Shubham

[shubmane]

No source available for "__udivmoddi4() at 0x80003ce"

[TDK]

Step through the code, what happens after the call to app_entry_1?

It would be better to disable interrupts as in the example code.

How to jump to system bootloader from application ... - STMicroelectronics Community

[Pavel A.]

Your variables app_stack_pointer_1, app_reset_vector_1, app_entry_1 may be located on the stack.

Line 20 (__set_MSP) moves the stack pointer. What do you think happens to the variables on the stack?