Delta Patch updates

[solsbarry]

Wondering if there was ever any talk of adding an update mechanism where only a delta between the old and new application needs to be transferred (with a mapping of where the changes need to go), and then MCUboot can just paste in the changes to the original application. When the application changes are generally minor, this kind of thing can save update time, flash space, and is really beneficial for very low power battery constrained applications. If this hasn't been talked about before, is there is any openness to the idea?

[nordicjm]

Not in MCUboot, an application could do this by downloading a diff, then running it with the original data from it's own image and writing it into the other slot so that MCUboot is unaware of it and it works which is how someone else has done it (which was presented at a recent zephyr conference)

[solsbarry]

Thanks. That's an interesting suggestion, just have the application use the diff to build up a full image in the secondary, and then reboot. I guess that makes sense.