Is it possible to prevent raspberry pi 3 from booting up automatically when i connect power?
Use case: i'm using shutdown -h for shutdown/halt, and then a push button in pins 5 & 6 to start again. I wan't that the first time i connect the pi to power, it stays "halted".
Idea: programmatically shutting it down when booting the first time?
No; it is not possible without some additional hardware.
Additional Information:-
When the Pi is shutdown, it enters a HALT state. However there is still code running, which is why the Pin5 can reboot. See https://raspberrypi.stackexchange.com/a/19754/8697 for some explanation.
If the Pi has never been booted Pin5 will do nothing.
A better solution for the B+ (and later boards) is to use the Run header.
Still without some circuitry to hold the Pi in a HALT, it will boot on powerup.
