RE: Does Immutable bootloader supports the nRFConnect SDK updates?

Amanda Hsieh — Mon, 29 Apr 2024 13:51:13 GMT

Hi,

[quote user=""]1. Now if we migrate our application to support SDK v2.6.0 and if we provide an update using DFU-OTA to our on-site device which has the applications developed on SDK 2.4.1, will this update work?[/quote]

It should work, and it also requires using the same static partition. See Static partition requirement for DFU.

[quote user=""]2. Does the bootloader used in SDK 2.4.1 will support the application developed in SDK 2.6.1?[/quote]

The same answer as Q1, but I would suggest you upgrade the bootloader for bug fixing.

[quote user=""]3. Also in future, will this Immutable Bootloader be compatible with New SDK releases?[/quote]

It's supposed to.

[quote user=""]4. If this Immutable Bootloader is not supportive, then using a second-stage bootloader is the only option ?[/quote]

Using the second-stage upgradable bootloader is one option if the immutable bootloader does not support the necessary features or updates. See the Second-stage upgradable bootloader doc.

However, it's important to note that adding a second-stage bootloader should only be done when necessary by the design or firmware upgrade needs. Adding the second stage bootloader for no reason can lead to a degradation of the system’s overall security, as attackers can exploit bugs that may exist in either bootloader.

Regards,
Amanda H.