Inspired by a number of other hacks on this board which fixed things like needing to push a button on the UPS to boot the Raspberry Pi, [Joachim] set out to make a similar ATtiny-based solution ...
On Raspberry Pi boards, when the CPU is in halt state ... When the system enters the halt state and we push the button, GPIO3 is pulled low and the system resumes. For soft power-off, we need ...