Bootloader won't start the application when I change the application start address

[Timur Beganovic]

I am using secure dfu bootloader from the SDK 12.

I changed the start address of my application. In the bootloader, in uint32_t nrf_dfu_init() { }, calling function nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR) with the new start address.

After I flashed the application, the bootloader goes to hard fault after executing the sd_mbr_command in:

uint32_t nrf_dfu_mbr_init_sd(void)
{
    uint32_t ret_val;

    sd_mbr_command_t command =
    {
        .command = SD_MBR_COMMAND_INIT_SD
    };

    ret_val = sd_mbr_command(&command);

    return ret_val;
}

This function was called by nrf_bootloader_app_start()

It seems that forwarding interrupts to SD fails for some reason, but I don't know why.

I would appreciate any sort of help to this problem. Thanks!

[Timur Beganovic]

OK, I found out what was wrong.

First, I forgot to mention that this is DFU Bootloader and that I flash the application Over The Air. Besides the application start_address I also had to change the CODE_REGION_1_START which is the address where the application is being flashed. Since I had not changed this value, my application wasn't flashed at the right place and that's why the Bootloader couldn't find it.

[Einar Thorsrud]

Thank you for letting us know how you fixed it.