We are not sure it really jumps to the bootloader
Please see code attached, especially note if required to add code for memory remapping:
void jump_to_bootloader(void) {
void (*SysMemBootJump)(void);
/**
* Step: Set system memory address.
*
* For STM32U575xx, system memory is at 0x0BF90000
* For other families, check AN2606 document
*/
volatile uint32_t addr = 0x0BF90000; // STM32U575xx
/**
* Step: Disable RCC, set it to default (after reset) settings
* Internal clock, no PLL, etc.
*/
HAL_RCC_DeInit();
/**
* Step: Disable systick timer and reset it to default values
*/
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
/**
* Step: Disable all interrupts
*/
__disable_irq();
// /**
// * Step: Remap system memory to address 0x0000 0000 in address space
// * For each family registers may be different.
// * Check reference manual for each family.
// *
// * For STM32F4xx, MEMRMP register in SYSCFG is used (bits[1:0])
// * For STM32F0xx, CFGR1 register in SYSCFG is used (bits[1:0])
// * For others, check family reference manual
// */
// //Remap by hand... {
// SYSCFG->MEMRMP = 0x01; //F7
/**
* Step: Set jump memory location for system memory
* Use address with 4 bytes offset which specifies jump location where program starts
*/
SysMemBootJump = (void (*)(void)) (*((uint32_t *)(addr + 4)));
/**
* Step: Set main stack pointer.
* This step must be done last otherwise local variables in this function
* don't have proper value since stack pointer is located on different position
*
* Set direct address location which specifies stack pointer in SRAM location
*/
__set_MSP(*(uint32_t *)addr);
/**
* Step: Actually call our function to jump to set location
* This will start system memory execution
*/
SysMemBootJump();
/**
* Step: Connect USB<->UART converter to dedicated USART pins and test
* and test with bootloader works with STM32 Flash Loader Demonstrator software
*/
}
