Build worked:
west build -d build/microbit/hello_world -b bbc_microbit samples/hello_world
but flash failed:
west flash -d build/microbit/hello_world
Related: mattoppenheim.com/2018/06/24/using-udev-to-remove-the-need-for-sudo-with-the-bbc-microbit
The build also generates a .hex file by default, and we've tried to flash it manually with:
cp build/microbit/hello_world/zephyr/zephyr.hex /media/ciro/MICROBIT/
but we failed to see it do anything with zephyr/blink_gpio.c, so not sure if the flashing was broken or if the code was broken, or if we didn't find the IO pins correctly.

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