--- In "Daniel Souza" <>
wrote:
>
> Hi
>
> I need the board to send a signal after umount the file system.
This
> signal (or pulse) will be sent to one circuit that will cut the
power
> of the board. The idea is to make linux shutdown first and then cut
> the power of the board.
>
> Thanks,
>
> Daniel
>
1/ depending on why you want to cut power to the board, would the
monitoring cct consume less than a shutdown -h TS board?
2/ would it by simpler just to issue the sync command to flush all
disk caching then power off the board in a live state? You probably
dont need to do a full shutdown anyway.
3/ there was some discussion in the last 2 weeks here about the state
of IO lines before and during start up. You could may get some ideas
from that as a means of using the state of one IO pin to indicate the
power on state rather than explicitly sending a pulse at the end of
power down.
4/ send your pulse just before powering off essential functions and
cut the power 2s later.
hopefully, one of those approaches will do what you need.
/js
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