cape-universaln error


I am trying to configure P9.14 pin as pwm. What I am doing is :

root@beaglebone:~# echo cape-universaln > /sys/devices/bone_capemgr.9/slots
bash: echo: write error: File exists

So I am not able to execute config-pin command because pinmux in not created.

Please help.

Below is the link of the blog which I am refereing.


The not particularly helpful error likely indicates something already
loaded is conflicting with loading the universal overlay.

Some specifics of your setup would be helpful:

cat /etc/dogtag
uname -a
cat /sys/devices/bone_capemgr.*/slots

...otherwise, review the contents of the slots file and see if there's
anything unexpected.