OSD335x-SM-RED: PRUs and RT linux compatibility

[mrazeja7]

Hello,
I’m trying to get familiar with the OSDM335x-SM-RED board. I’ve run into two issues that I haven’t been able to resolve.

1) I am having trouble getting the PRU to work. I’ve tried following a guide intended for the Beaglebone Black board and ran into problems.
The example I followed can eb found on this address: http://mythopoeic.org/bbb-pru-minimal/
I got stuck at the “Enable the PRU” step. The /sys/devices/bone_capemgr.9/slots path doesn’t exist on my system. I managed to find a different path, /sys/devices/platform/bone_capemgr/slots, but I cannot write into it even with root privileges.

Could you please point me in the right direction or provide a simple example on how to get the PRUs working under the provided linux image?

2) Another problem I ran into was when using the SDK RT Linux image provided by Texas Instruments (PROCESSOR-SDK-LINUX-RT-AM335X 05_02_00_10). I couldn’t getthe ethernet port to work. I tried contacting TI’s support forum, but no solution has been found yet.

Is there an image of RT Linux that works with no problems on this board?

Thank you.

[Erik Welsh]

For the PRUs, here are a couple of tutorial links that should help:

1. Basic Introduction to PRUs:  http://beagleboard.org/pru
2. TI PRU Training Lab:  http://processors.wiki.ti.com/index.php/PRU_Training:_Hands-on_Labs
3. remoteproc and UIO:
   • http://ianrrees.github.io/2016/11/20/getting-started-with-beaglebone-pru-programming-the-new-way.html
   • https://jumpnowtek.com/beaglebone/Working-with-the-BeagleBone-PRUs.html

 

For the RT linux, you should be able to build an image using the instructions found:

https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black

See section “For am33x-rt-v4.14 (Longterm 4.14.x + Real-Time Linux)”.  We have used these build instructions on an Ubuntu 16.04 VM.

Please let us know if you have any additional questions.

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