On Fri, 14 Apr 2017 19:25:11 +0100, Ahem A Rivet's Shot wrote:

> On Fri, 14 Apr 2017 16:30:48 -0000 (UTC)
> Frank Miles  wrote:
>
>> I have an embedded application for the RPi-3.  Unfortunately it's likely
>> that uses will remove power without properly shutting the RPi down.
>> Therefore I've got a 'power-going-down' bit of hardware which sets a GPIO
>> bit causing a proper shutdown.  The question, of course, is how long does
>> a shutdown take?
>
>  It depends - mostly on how fast the SD card is, how many dirty
> buffers need to be flushed and how long processes take to die. Best bet is
> to measure it under your worst case loads with the card you intend to use
> and add a healthy safety factor.

Ok, reframing :
  What's the easiest way to detect when shutdown is complete?

Thanks!
  -F

--- SoupGate-Win32 v1.05