It's been my experience that if you're running 4.x kernel it's best not to use config-pin at all. For simple GPIO it works ok most of the time. But for more complex configurations it may not work all that well. There is at least one GPIO( P9.27 I think ) that won't properly display it's high / low value despite the pin being physically changed. This has been confirmed on our hardware here. This, can be a game changer if you need to monitor the pin states, and you need this pin.
My buddy uses a simple yet long winded bash script to test our hardware, and that works well for him. So it wouldn't be too much of a stretch to imagine running a systemd service that calls a bash script that in turn configures the pins via config-pin. Faster still would be to write your own device tree overlays, and load them via uEnv.txt at boot. This has the benefit of loading the pins very early ( in the initrd just a few seconds after boot ) Experimental versions of uboot can even load overlays the fastest, but multiple overlay loading seems a bit glitched the last time I tested( a couple months ago ). The last tow options here of course having nothing to do with config-pin / universal IO. On Thu, Feb 16, 2017 at 9:00 PM, Drew Fustini <[email protected]> wrote: > Anyone have a favorite way to run config-pin after a BeagleBone boots up? > > > Background: > this question came up in this thread on the Adafruit forum where a BBGW > boots with 4.4 ti kernel and univ-all-00A0.dtbo: > > "Re: Green Wireless + DHT22 = not working?" > https://forums.adafruit.com/viewtopic.php?f=49&t=111784#p559251 > > > thanks, > drew > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/62afcae0-3fcb-441e-8292-1f39b9b2c8a7%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/62afcae0-3fcb-441e-8292-1f39b9b2c8a7%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORqe8MgrUSS5%2BRBzbewGyfLjs%3D0KzFY6bSQRwQjqLV_XLw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
