I am trying to figure out the how to configure the device tree overlay for 
the PRU-cape.

I am using the latest recommended image 
from http://beagleboard.org/latest-images (i.e. Debian 8.3 Linux beaglebone 
4.1.15-ti-rt-r43) without any changes. 

I uncommented the following line in uEnv.txt because I read that the HDMI 
interface has to be disabled
##BeagleBone Black: HDMI (Audio/Video)/eMMC disabled:
dtb=am335x-boneblack-overlay.dtb

This is what works:
1.) I can build and load the PRU_LED0.out from TI's software support 
package onto PRU0 with remoteproc
2.) Then I use the command "config-pin P9.30 pruout" and the led blinks

But I this only works with this particular pin. I would actually like is to 
enable all the pins for the PRU that are in defined 
"am335x-boneblack-prucape.dtsi". I have tried a myriad things (I don't 
really want to list all of them, but if it helps i will). 

Can anyone give me a hint on how to enable the overlay? 

There seem to be different ways to enable pins i.e. use "config-pin", 
loading adding an overlay to "/sys/devices/platform/bone_capemgr/slots", 
going to the "/opt/source/dtb-4.1-ti/" directory and changing and making 
the files there. What is the recommended way? 

Should I use a different image?




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