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?

Regards,


On Wednesday, July 12, 2017 at 7:57:24 AM UTC-4, Kevin M. wrote:
>
> Hi, 
>
> I am currently using a BBB with Debian Jessie 8.8 and 4.4.x kernel 
> installed. I was trying to configure the P9_25 pin using the command 
> "config-pin P9_25 gpio_pu" but the BBB keeps throwing me the error 
>
> P9_25 pinmux file not found!
>> bash: /sys/devices/platform/ocp/ocp*P9_25_pinmux/state: No such file or 
>> directory
>>
>>
> I have loaded the cap-universal-00A0 overlay from this github page
>
> https://github.com/cdsteinkuehler/beaglebone-universal-io
>
> and I believe that it should have created a P9_25_pinmux dir in the 
> /sys/devices/platform/ocp/ which is apparently missing. 
>
> I have been working on this for a couple of days already mostly because I 
> don't know much about embedded system as I'm currently a newbie. Any help 
> would be appreciated. Thanks.
>

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