[cb22]

> I’d rather just put a normal Linux distro there, however, I’m not feeling like waiting 8 seconds every time I turn in my car.

I've been working on a Pi Zero W based carputer (really, it's headless and just interfaces with my phone over Bluetooth / the existing radio head unit and steering wheel menu and controls).

Boot time is probably around ~8 second mark currently (fully booted with buildroot / systemd, it's powered from 12V switched by the key) and it already feels fast enough. I normally start my car, put on my seat belt and look around. By the time I've finished doing that it has connected to my phone.

Of course, it would be possible to do even smarter things. Hook up a low power micro that can interface with the CAN bus and a MOSFET, and you can instead power it from the battery and turn it on when the car is unlocked and off after a timeout based on the engine going off.