Secure bootloader for nrf52840 (Dongle)

[Tabassum]

Hi

Am trying to implement the secure bootloader for the nrf52840 for Dongle,I have gone through the existing example for nrf52382 but am unable to find any example for nrf52840 (Dongle)

It would be helpful if someone share any implementation suggestion .

Thanks

Tabassum

[bjorn-spockeli]

Tabassum: Are you looking for a BLE bootloader or a USB/UART bootloader? 

[Tabassum]

Hi bjorn 

Am trying to implement for UART 

Thanks 

Tabassum

[bjorn-spockeli]

You should be able to use the examples\dfu\secure_bootloader\pca10056_uart project. The only thing you should need to change is the board definition file, which is done by replacing  BOARD_PCA10056 with BOARD_PCA10059 in the Preprocessor definitions. 

[Tabassum]

Hi bjorn

Thanks for your suggestion it was helpful, But now am facing issue in erasing the secure bootloader from dongle as my device is not getting detected in command line tool,The following is the screenshot when dongle is connected and is failing to be detected by command line tools,Please suggest the alternative.

Thanks

Tabassum

[bjorn-spockeli]

The nRF52840 Dongle is not supported in nrfjprog as it does not have a JLink OB on it. Instead you need to use the nRF Connect Programmer app, which uses the USB bootloader on the nrF52840 to update the firmware. Please see the nRF Connect Programmer documentation.

[Tabassum]

Hi bjorn

I tried using nrf connect programmer as well , Am not getting any option to erase all or erase and write

[bjorn-spockeli]

The nRF52840 Dongle comes preprogrammed with the Open Bootloader with DFU, which allows users to update the application firmware. However, as stated in the link above: 

• Bootloader update must come from signed packages.

We do not distribute the private key that the public key in the Open Bootloader uses, so the only way to update the bootloader on the nRF52840 dongle is to re-flash using a JLink programmer or the JLink OB programmer on a nRF52xxx DK. You will then have to solder wires to the SWDCLK and SWDIO pads on the nRF52840 Dongle or solder on a 10-pin programming header to the P1 pads.