Serial bootloader / DFU without softdevice and crypto

[T IJ]

Hello DevZone,

On my board I have a nRF52810 and a nRF52840. I want to implement a serial bootloader for the nRF52810 and have the nRF52840 program it.

I have looked for example projects for DFU over serial and found only projects that have encryption built into the library.

Is there a example project available where I can use the bootloader / DFU without encryption? 

The nRF52810 does not use the softdevice, both devices are using the SDK 17.0.2, the nRF52840 does use the softdevice.

I'd preferably would use an example project but it should not be a problem if I have to write the bootloader / DFU myself.

Kind regards

[Sigurd]

Hi,

For the nRF52810 I think the easiest would be to start with the pca10040e_uart project in nRF5_SDK_folder \examples\dfu\secure_bootloader. To relax the security, modify the settings similar to the Open Bootloader. https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/ble_sdk_app_open_bootloader.html

Currently we don't have an official DFU Master code running on embedded chip (for example updating an nRF52 from another nRF52 via BLE or UART/SPI), but we have some unofficial code at chapter 6 in this post:  Getting started with Nordic's Secure DFU bootloader, a step by step guide 

[T IJ]

Sigurd said:

To relax the security, modify the settings similar to the Open Bootloader.

Are these settings listed in the SDK_config or are they scattered throughout the code? 

Sigurd said:

Getting started with Nordic's Secure DFU bootloader, a step by step guide 

I have seen this post before, I'll check if this can help me out

[T IJ]

I have compared the two SDK_Config files and made the modifications, I still get errors that there are undefined refferences to g_nrf_crypto_ecc_secp256r1_curve_info, nrf_crypto_ecdsa_verify, g_nrf_crypto_hash_sha256_info and more. I have disabled all these features in the SDK config.

If I enable those features and keep nrf_crypto disabled I get :

fatal error: nrf_cc310_bl_hash_sha256.h: No such file or directory