[riot-notifications] [RIOT-OS/RIOT] cpu/cc2538: add riotboot feature (#15392)

Francisco notifications at github.com
Wed Nov 11 18:36:00 CET 2020


> > I also moved the `riotboot` feature declaration since its technically a `BOARD` feature since it involved the flasher.
> 
> I find the `riotboot` feature a bit confusing because it actually means 'CPU supports riotboot', not 'riotboot is flashed on the board'.
> But this is unrelated to this PR.
> 
> Please squash.

Well it means more things it means:

- cpu has a `jump to something`, idempotent `board_init`
- linker script can link at an offset with a customizable firmware size
- a board has a cpu fulfilling the above and can be used with a flasher supporting flashing at a differential offset and without mas erase.

But you are still right, its more about `FEATURES_PROVIDED += riotboot` and `FEATURES_PROVIDED += riotboot_flasher` 

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