@sendpaws @phnt You're misunderstanding. I don't mean that they don't have an OS, it's that they don't have the same type of "driver" and that you would install on Windows or Linux (or FreeBSD) to expose an API (DirectX, Vulkan, etc) for talking to the GPUs.

I'm trying to think of who I know that can speak with some authority on this. I suspect @TTimo can clarify and correct me on the major differences that go beyond hardware