And an important note on that: ChibiOS is still a work in progress. It is not complete or a production stable release. Lots of things still need to be done and lots more testing is required. It is to be considered experimental still, and should in no way be considered any more safe than any other experimental firmware is. Putting it on high value vehicles, or for paying customers that expect production stable and safe firmware is not wise and at your own risk. You are a test pilot flying ChibiOS at this time.
Since there are some very new autopilots out now that can only use ChibiOS (like the “pixhawk 4” and the CUAV v5), users of that hardware need to understand what they are getting into at this time. You’re taking a brand new piece of hardware, which has very little testing or history to begin with (as does anything new), and putting experimental and incomplete firmware on it. This is a double-whammy of test piloting at your own risk.
IMO, it would be abject lunacy to put this combination on a high value vehicle, or any vehicle a paying customer expects to be safe, stable, and proven. A vehicle that is of size and power to injure or kill people using this combination, when flown in the vicinity of people other than the test pilot, is frankly careless and reckless operation of an aircraft.
This isn’t a knock on the pixhawk 4 or hack. It’s the reality of any brand new hardware or any brand new experimental firmware, which applies regardless of who made it. Please be careful with this stuff and understand the risks when you dive in.