Flashing SD+App+BL SDK12.2

[brett_anderson]

I am trying to flash all three images together. I have the firmware updating working, but if you flash them together, the bootloader doesn't know that the application is programmed. I found this post POST

There are differences however. I found the nrf_dfu_settings.c file, and found a similar line to what is referenced in the post. In nrf_dfu_types.h, I found defines that are similar, and I edited the line to add "NRF_DFU_BANK_VALID_APP" to the bootloader settings. This did not work however.

Are there other settings I need to change?

[bjorn-spockeli]

Hi Brett,

you are correct that the bootloader does not know that there is a valid application if you flash the bootloader, application and SoftDevice with a programmer.

In order to set the correct bootloader settings you need to generate a bootloader settings hex file using nrfutil.

nrfutil settings generate --family NRF52 --application application.hex --application-version 3 --bootloader-version 2 --bl-settings-version 1 settings.hex

which will generate the settings.hex file and output something like this to your terminal

Bootloader DFU Settings:
* File:                 settings.hex
* Family:               nRF52
* CRC:                  0x2B1E5436
* Settings Version:     0x00000001 (1)
* App Version:          0x00000003 (3)
* Bootloader Version:   0x00000002 (2)
* Bank Layout:          0x00000000
* Current Bank:         0x00000000
* Application Size:     0x00003AF4 (15092 bytes)
* Application CRC:      0xF7A69330
* Bank0 Bank Code:      0x00000001

The generated settings.hex file should be merged with the bootloader hex file using the following mergehex command

mergehex -m settings.hex secure_serial_bootloader.hex -o bootloader_w_settings.hex

The merged hexfile can now be flashed to the nRF52 along with the application and the softdevice. (You can also use mergehex to create a single hex file that contains the bootloader, bootloader settings page, application and softdevice).

Best regards

Bjørn

[Nguyen Hoan Hoang]

Using the IDAP-Link Debug Jtag with IDAPnRFPRog, it will take care of the proper settings for you. You only need to give it the 3 hex files.

[Daniel Wang]

You get the correct bootloader settings with that?.... you still have to use nrfutil ?

[Nguyen Hoan Hoang]

The IDAPnRFProg program will flash Softdevice + App + DFU and set all necessary data to boot into the app. No nrfutil require or mergehex require. nrfutil is still needed when you do OTA.

[brett_anderson]

Thanks Bjorn. A couple quick follow up questions:

1. Is this documented somewhere and I missed it?
2. the bootloader_settings.c file reserves space for the settings. Can I write in the settings here?