https://www.hackster.io/news/olivier-benjamin-finds-a-currently-undocumented-raspberry-pi-feature-for-secure-a-b-updates-0df38de1c9e6
A recently-added conditional in the Raspberry Pi firmware makes it suitable for A/B updates using RAUC, Bootlin's Benjamin demonstrates.
olivier benjaminraspberry pifindscurrentlyundocumented