Linux/AM5728: /sys/class/remoteproc directory never appears

brent goldberg

Part Number: AM5728

Tool/software: Linux

Linux 4.9.32, AM5728

I am attempting to setup the PRU and I have the modules rpmsg_pru, pru_rproc, prusss_intc, pruss, virtio_rpmsg_bus and remoteproc built and loading correctly. I also have /dev/rpmsg_puu30->33 and the default echo example to and from the firmware works fine (e.g., PRU_RPMsg_Echo_Interrupt_1_0.out).

However, the remoteproc module does not create /sys/class/remoteproc directory at all. Does anyone know why this might be?

over 6 years ago

0 Margarita Gashova over 6 years ago

TI__Guru* 80190 points

Hello,

What is the software release and version that you are using here?

Please check this thread is it helpful for you:

https://e2e.ti.com/support/processors/f/791/t/671247

http://software-dl.ti.com/processor-sdk-linux/esd/docs/05_03_00_07/linux/Foundational_Components_PRU-ICSS_PRU_ICSSG.html

Best Regards,

Margarita

0 brent goldberg over 6 years ago in reply to Margarita Gashova

Prodigy 110 points

The kernel is 4.4.32-ti. It's debian-arm version 9. I have modules remoteproc, rpmsg_rpu, pruss, & pru_rproc loaded. The echo test via the rpmsg works fine.

0 brent goldberg over 6 years ago in reply to Margarita Gashova

Prodigy 110 points

And the remoteproc messages in dmesg look healthy. Looks like it loads fine and I see no errors, I just don't have any /sys/class/remoteproc directory or subdirectories.

0 brent goldberg over 6 years ago in reply to Margarita Gashova

Prodigy 110 points

The link itself didn't particularly help, but it seems to imply the problem likely lies in the dtsi. Which frankly, I have no real idea what it needs to contain but kind of copied something from a beaglebone file that got me this far so that it actually seems to have loaded all the modules and runs the PRU. I just can't get the directory to populate.

0 Margarita Gashova over 6 years ago in reply to brent goldberg

TI__Guru* 80190 points

Hello,

We are not supporting Debian in this forum. Please refer the links in my previous post.

Best Regards,

Margarita

0 brent goldberg over 6 years ago in reply to Margarita Gashova

Prodigy 110 points

I know that has nothing to do with this, but whatever...about the customer service I expected.

0 brent goldberg over 6 years ago in reply to Margarita Gashova

Prodigy 110 points

The question is essentially what does a DTS file need to contain to enable remoteproc to setup the /sys/class/remoteproc directory. My hope is that this is workable without it since I don't expect to get an answer....otherwise TI can look for a few thousand AM5728s not to be sold.

0 Nick Saulnier over 6 years ago in reply to brent goldberg

TI__Guru** 105940 points

Hello Brent,

TI provides the Linux Processor SDK for software development. We do not support questions about Debian Linux, but but we do support questions about the TI Linux distribution. Linux 4.4 is pretty old, so even if you were using a Linux Processor SDK I would only be able to give limited support unless you were using Linux 4.9 or Linux 4.14.

Our documentation for running the default RPMsg example assumes that /sys/class/remoteproc exists. See the RPMsg Quick Start Guide and the RemoteProc and RPMsg documentation. So I am curious about what steps you are taking to load and start the PRU firmware.

Regards,

Nick

0 brent goldberg over 6 years ago in reply to Nick Saulnier

Prodigy 110 points

I found I can load new firmware was a quick reboot, so I'm not losing sleep over this. You can close this out if you like.

I have a couple other issues such as why PRU1 is acting like PRU0, but I take it that I won't find any answers on this forum.

0 Nick Saulnier over 6 years ago in reply to brent goldberg

TI__Guru** 105940 points

Hello Brent,

On the question about using the right DTS and kernel configs to get /sys/class/remoteproc, I would suggest downloading a Linux Processor SDK for the AM57xx. Take a look at the device tree files there to see how we define the cores that use remoteproc. I can offer guidance in that process if you decide to do it.

Feel free to create a separate thread to discuss your question about PRU1 acting like PRU0. Just keep in mind that if the question involves things from the Linux side (instead of the PRU core side), Debian questions should go to the wider community and Processor SDK questions can go on the TI forums.

Regards,

Nick

0 brent goldberg over 6 years ago in reply to Nick Saulnier

Prodigy 110 points

That's a very good suggestion. I will review those configuration files to see if they have any good tips for me! I'm pretty lost with DTS files, but learning.

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Linux/AM5728: /sys/class/remoteproc directory never appears