nRF52 secure uart bootloader does not start application

[gat]

Hi,

Sorry to seek help again but I cant solve this issue

Steps

1 - nrfjprog -f nrf52 --eraseall

2 - nrfjprog -f nrf52 --program mbr.hex --sectorerase --verify

With the mbr in "nRF5_SDK_17.1.0_ddde560\components\softdevice\mbr\hex\mbr_nrf52_2.4.1_mbr.hex"

3 - nrfjprog -f nrf52 --program btl.hex --sectorerase --verify

With the bootloader in "nRF5_SDK_17.1.0_ddde560\examples\dfu\secure_bootloader\pca10056_uart_debug\armgcc\_build\nrf52840_xxaa_mbr.hex"

Compiled configured for my custom board

4 - nrfutil dfu serial -pkg app.zip -p COM4 -fc false -b 115200

Output

I think the bootloader crashes before jumping to my app, here are the RTT logs 

<info> app: Inside main

<debug> app: In nrf_bootloader_init

<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> nrf_dfu_settings: Using settings page.

<debug> nrf_dfu_settings: Copying forbidden parts from backup page.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.

E000.

001000

Also while debugging the bootloader I get a breakpoint there

It looks like the bootloader crashes when writing in flash, what did I do wrong ?

[Vidar Berg]

Hello,

If you haven't done it already, please check if the application runs as expected if you program it directly (not DFU) along with the MBR.hex. Maybe there is an issue with the linker settings. The app must start at 0x1000 in FLASH and 0x20000008 in RAM to work with the MBR present.

Best regards,

Vidar

[gat]

Thanks for the very fast answer !

The issue was the addresses in the linker script of my app