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

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

Einar Thorsrud — Tue, 29 May 2018 07:44:32 GMT

Thank you for letting us know how you fixed it.

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

Timur Beganovic — Mon, 28 May 2018 14:14:00 GMT

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.

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

Timur Beganovic — Fri, 25 May 2018 12:29:29 GMT

Thank you for the answer

I verified it debugging the Bootloader, the program never reaches the breakpoint after nrf_dfu_mbr_init_sd().

I also wonder why this happens when I change the start address, since the address is not used before sd_softdevice_vector_table_base_set().

Maybe another important behavior: when I change the start address only in Application .hex file and doesn't change the start address in the Bootloader, then the Bootloader executes these functions ( nrf_dfu_mbr_init_sd(), sd_softdevice_vector_table_base_set()) and crashes first in nrf_bootloader_app_start_impl().

I am not able to enable log.

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

Einar Thorsrud — Fri, 25 May 2018 10:31:36 GMT

Hi,

You should not see an issue within nrf_dfu_mbr_init_sd() because you have changed the start_addr, as it is not used that early. Referring to the implementation of nrf_bootloader_app_start() in nrf_bootloader_app_start.c for SDK 12.0.0, the start address parameter is only used in the subsequent calls to sd_softdevice_vector_table_base_set() and nrf_bootloader_app_start_impl() which.

How have you verified that there is a hard fault, and that it occurs during the call to nrf_dfu_mbr_init_sd()? Can you enable logging and upload the log?