SK-AM62B-P1: Issue with configuring PWM through the User Expansion Connector

Hello Rahul,

TI has recently begun providing debian images as well as yocto images.
https://www.ti.com/tool/download/PROCESSOR-SDK-LINUX-AM62X
https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_00_07_Debian/exports/docs/debian/Overview.html 

Keep in mind that we can support software released by TI on these forums, but we CANNOT support software released by other groups, or general Linux programming questions. Are you using a TI debian image?

I am sending your thread over to a team member who is more familiar with Debian to comment.

Regards,

Nick

Hello Nick,

Thanks for your time. This is not a general Linux programming question. I'm using the Debian Image provided by TI. Also eHRPWM and eCAN drivers are from TI. 

So I want to know if these kernal drivers can be loaded to my kernal space as a loadable kernal module. or Should I rebuild the kernal with these drivers added?

Also, here is the kernal version:

I have tried with the non RT kernal version and same result : 

Hello Rahul,

Ok, so it looks like the kernel & uboot are pretty much the same (if not identical) between Debian & yocto filesystems.

Please refer to the SDK's PWM documentation here for how to enable PWM in the kernel configs, and an example of how to test the PWM:
https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_00_07_04/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/PWM.html

Regards,

Nick

Hello Nick, 

This is the same link which I referenced in my initial query. My concern is, there is 2 drivers mentioned in the link eHRPWM and eCAP, which is to be in the kernal space. I guess my /sys/class/pwm is empty because these drivers aren't installed. So what should I do next? Should I rebuild the kernal and add these drivers? or Is there a way to add these drivers as loadable kernal modules?

Hello Rahul,

Yes, you should be able to have those kernel drivers either as built-in to the kernel, or as loadable kernel modules.

First, make sure the PWM drivers are enabled in the kernel configs, as discussed in that PWM page.

Then, rebuild both the Linux kernel and the kernel modules, as discussed here:
https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_00_07_04/exports/docs/linux/Foundational_Components_Kernel_Users_Guide.html

Then copy the newly built kernel and kernel modules into your Debian filesystem.

Regards,

Nick