Links
CircuitPython on Raspberry Pi (Bare Metal / No OS)
learn.adafruit.com
Instead of Raspberry Pi OS, one can now use CircuitPython instead. CircuitPython running without another operating system (OS) is typically known as “bare metal”. This greatly simplifies system maintenance and makes it easier to treat the Raspberry Pi like a microcontroller. In addition, running CircuitPython on the Raspberry Pi increases the amount of flash and RAM available to CircuitPython programs. Finally, it also adds the ability to use displayio on HDMI displays.