Hi,
I'm not quite sure whats the problem is but if its for just enabling and 
running the PRU along with its I/O's i prefer to go with cape-universala.

plus I too faced a similar error while programming PRU under kernel 4.+ so 
later downgraded my kernel to 3.8.45 and enabled cape-universala so it 
worked for me.

Hope this helps. 

On Monday, February 26, 2018 at 7:17:53 AM UTC+5:30, Alan Thomason wrote:
>
> Hello all...
>
> I am trying to use a newer image than I have in the past:
>  BeagleBoard.org Debian Image 2017-10-10
>
> I have flashed the eMMC and am able to boot from it with no microSD card 
> in place.
>
> I have been working for the last year with an older (2014) image and I 
> compile and load an overlay.using the capemgr (sudo sh -c "echo 
> DesiredOverlay > /sys/devices/platform/bone_capemgr/slots") method.  I 
> understand from other posts that this is no longer the preferred method, 
> and I need to use the new method.  I *think* I have done what the 
> following suggests:
> https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays
>   starting at:  U-Boot /boot/uEnv.txt configuration
>
> But I can't use the same PRU processes as I used before.  I get an error 
> (Segmentation fault) that in the previous image would indicate that I had 
> not yet loaded the overlay.  I don't see anything in the dmesg output that 
> would indicate that the uboot/uEnv.txt had run at all.
>
> My questions:
> 1. Does it look like I am properly loading the overlay 
> (EBB-PRU-CNKSim-00A0.dtbo) in the uEnv.txt?
> 2. Shouldn't I be able to see this in the dmesg output?
> 3. Is there a possibility that the /boot/uEnv.txt is not being run?
> 4. Is there an  easy way to put tell-tales in the uEnv.txt file so that 
> you could easily see where in the file the process had gotten to?
>
> Thanks in advance,
>
> Alan
>

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