STM32H7 Changing boot1 adress in OBFlash

Question

I am having troubles changing boot1 address in Option Byte in Flash

I want to change boot1 address, allowing me to launch either in bootloader mode (system memory) or usercode mode(flash) without using a jump.

I am currently testing on the STM32H743 EVAL Board

Here is the code changing the address and it does not appear its changing anything

HAL_FLASH_OB_Unlock();
HAL_FLASH_Unlock();
 
/* Change Boot0 address */
 
if(mode)OBInit.BootAddr1 = BOOTLOADER_ADDR0;
else OBInit.BootAddr1 = USER_CODE_ADDR0;
HAL_FLASHEx_OBProgram(&OBInit);
 
if (HAL_FLASH_OB_Launch() != HAL_OK)
{
    return(-1);//error
}
 
HAL_FLASH_OB_Lock();
HAL_FLASH_Lock();

Thanks,

Gabriel

Answer 1

Fixed : added OBInit.BootConfig=OB_BOOT_ADD1; before if(mode)OBInit.BootAddr1 = BOOTLOADER_ADDR0;