I've been trying to get my test hardware back up and running after 
corrupting node and bonescript, see my earlier post.

I'm trying to get up and running with an 8.6 image as I couldn't get a 9.2 
image to provide pru_rproc support

debian@beaglebone:~$ uname -r
4.4.54-ti-r93

I'm trying to get the eqep support working on P8_31,33 & 35 (it was working 
before)

debian@beaglebone:~$ sudo config-pin -l P8_31
default gpio gpio_pu gpio_pd uart qep

Looks like qep is a supported mode...

debian@beaglebone:~$ sudo config-pin P8_31 qep
[sudo] password for debian: 
bash: line 0: echo: write error: No such device
Cannot write pinmux file: /sys/devices/platform/ocp/ocp:P8_31_pinmux/state

Any idea what is causing the above error? The important bits from uEnv.txt 
are:

##BeagleBone Black: HDMI (Audio/Video)/eMMC disabled:
dtb=am335x-boneblack-overlay.dtb

cmdline=coherent_pool=1M net.ifnames=0 quiet cape-universal=enable

##Example v4.1.x
#cape_disable=bone_capemgr.disable_partno=
cape_enable=bone_capemgr.enable_partno=cape-universala







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