Advanced users • Re: How to realize, when it is safe to turn the power off automatically

Code:

Name:   gpio-poweroffInfo:   Drives a GPIO high or low on poweroff (including halt). Using this        overlay interferes with the normal power-down sequence, preventing the        kernel from resetting the SoC (a necessary step in a normal power-off        or reboot). This also disables the ability to trigger a boot by driving        GPIO3 low.        The GPIO starts in an inactive state. At poweroff time it is driven        active for 100ms, then inactive for 100ms, then active again. It is        safe to remove the power at any point after the initial activation of        the GPIO.         Users of this overlay are required to provide an external mechanism to        switch off the power supply when signalled - failure to do so results        in a kernel BUG, increased power consumption and undefined behaviour.Load:   dtoverlay=gpio-poweroff,<param>=<val>