RE: App-based DFU, changing bank#1 address?

charles_fi — Fri, 13 Oct 2023 13:19:19 GMT

Thanks Vidar for the quick and helpful answer!

Best,

Charles

RE: App-based DFU, changing bank#1 address?

Vidar Berg — Fri, 13 Oct 2023 10:43:44 GMT

Hello Charles,

The address for bank 1 is not fixed. Instead, it adjusts automatically based on the size of the current Softdevice and application. You can use the nrf_dfu_bank1_start_addr() function found in nrf_dfu_utils.c to retrieve the address.

[quote user=""]But, we see that the bootloader protects the settings page.[/quote]

The settings page is only partially protected when you build the bootloader with `NRF_BL_DFU_ALLOW_UPDATE_FROM_APP`. The application will have write access to the following elements of the settings structure:

And the application must store the init command (i.e. the *.dat file) to .init_command. The bootloader will use the init command stored here to finalize the update.

Best regards,

Vidar