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A simple #OCaml "Hello World" for a #RPi4 as a bare-metal Operating System with #MirageOS (in 4 days) 
At this stage, I'm only able to boot the "caml runtime" on RPi4. But, in MirageOS, we did everything in OCaml, so it's perfect to start IoT in OCaml.
The next step will be the integration in MirageOS 4 where I specially pay my attention into how we orchestrate the compilation from the boot.S to the "caml_startup" function. UART is our serial port to be able to print something: en.wikipedia.org/wiki/Universal…
