cannot configure pins for eqep

I’ve been trying to use the eqep on this image: 4.4.87-ti-xenomai-r121, which is a real-time kernel used for the Bela Board (bela.io) . When I try to configure the necessary pins for the eqep, I get: root@bela:~# config-pin P8.33 qep
P8_33 pinmux file not found!
bash: /sys/devices/platform/ocp/ocpP8_33_pinmux/state: No such file or directory
Cannot write pinmux file: /sys/devices/platform/ocp/ocp
P8_33_pinmux/state

I can’t seem to figure out a solution or workaround for this, so any help is greatly appreciated!
Thanks!