Thx! I will try that right now.

On Thursday, July 13, 2017 at 1:31:35 PM UTC-4, RobertCNelson wrote:
>
> On Thu, Jul 13, 2017 at 12:09 PM,  <[email protected] <javascript:>> 
> wrote: 
> > I'm was having the same problem, 
> > 
> >> P9_26 pinmux file not found! 
> >> bash: /sys/devices/platform/ocp/ocp*P9_26_pinmux/state: No such file or 
> >> directory 
> >> Cannot write pinmux file: 
> /sys/devices/platform/ocp/ocp*P9_26_pinmux/state 
> > 
> > 
> > 
> > re-flashed the latest debian image yesterday and started working fine 
> again. 
> > Today after an apt-get upgrade it failed again. 
> > Something got broke? 
>
> the listed latest is just too old.. Grab the Jessie Monthy snapshot 
> flasher: 
>
> https://rcn-ee.net/rootfs/bb.org/testing/2017-07-01/ 
>
> debian@beaglebone:~$ config-pin P9_26 gpio_pd 
> debian@beaglebone:~$ config-pin -q P9_26 
> P9_26 Mode: gpio_pd Direction: in Value: 0 
>
> * it uses u-boot overlays, docs are here: 
>
> http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

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