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Feb 20 17:04:11 <puranjaymohan[m]> Anyone up for the meeting?
Feb 20 17:08:18 <mister_awesome[m> I'm here.
Feb 20 17:11:28 <hendersa> I'm here.
Feb 20 17:15:46 <puranjaymohan[m]> So what are you guys up to ?
Feb 20 17:18:39 * hendersa is just here to answer questions.
Feb 20 17:19:57 <hendersa> We won't know if we have been allocated slots for students until February 26th.
Feb 20 17:20:27 <hendersa> But, we can still talk about your project ideas until then.
Feb 20 17:29:11 <puranjaymohan[m]> Can you help me with resources to get started with device tree overlays
Feb 20 17:29:48 <puranjaymohan[m]> I want to learn it for the usb configfs project
Feb 20 17:32:41 <hendersa> The best way to learn about something like that is to have a few concrete examples and work from those.
Feb 20 17:32:51 <hendersa> For example, this might help you get the basics: https://learn.adafruit.com/introduction-to-the-beaglebone-black-device-tree
Feb 20 17:33:29 <hendersa> (That's a very old tutorial, but you can get a feel for the layout and flow of the device tree syntax.)
Feb 20 17:34:43 <hendersa> Derek Molloy's book "Exploring BeagleBone" is also very good, as are his YouTube lessons.
Feb 20 17:35:19 <hendersa> https://www.youtube.com/watch?v=wui_wU1AeQc
Feb 20 17:35:22 <puranjaymohan[m]> Thanks, will look into it.
Feb 20 17:35:23 <puranjaymohan[m]> Another thing I wanted to ask is I really want to contribute to the beagle board community even if it's is not participating in gsoc.
Feb 20 17:35:24 <puranjaymohan[m]> How to continue with that, is there another channel for that?
Feb 20 17:37:05 <hendersa> Do you have something in particular that you want to contribute? Most people see a problem or something that needs improvement and help with that.
Feb 20 17:37:58 <hendersa> If you look through GSOC project suggestions for 2017-2019, you can see several project suggestions that were never pursued by students.
Feb 20 17:39:03 <hendersa> Working with the hardware for fun and seeing where you get stuck will show you areas where you might help. Blogs, documentation, tutorials, etc. on how to fix or work-around issues are always helpful.
Feb 20 17:39:18 <puranjaymohan[m]> I want to work on the kernel development part and specifically the usb configfs project.
Feb 20 17:42:19 <hendersa> OK, well... have you ever written a kernel driver module? Built it outside of the kernel source tree?
Feb 20 17:42:30 <hendersa> Any kernel development at all?
Feb 20 17:42:46 <hendersa> Ever modified existing kernel code?
Feb 20 17:43:24 <puranjaymohan[m]> Yes I have worked with loadable kernel modules and specifically I have played with GPIO
Feb 20 17:44:21 <puranjaymohan[m]> But I haven't compiled a module directly into the kernel
Feb 20 17:44:39 <hendersa> Have you looked through the kernel source to see what kind of device tree bindings exist in the USB subsystem?
Feb 20 17:46:59 <puranjaymohan[m]> I am trying to understand the usb subsystem and reading the slides which were given to me here last Wednesday. Alongside that I am trying to learn device tree also
Feb 20 17:47:12 <hendersa> https://github.com/beagleboard/linux/blob/4.19/drivers/usb/core/of.c
Feb 20 17:47:33 <puranjaymohan[m]> Thanks :D
Feb 20 17:48:16 <hendersa> This is the code in the USB subsystem that parses the current device tree-supported properties for the USB subsystem.
Feb 20 17:51:47 <hendersa> In my experience, you can place a number of printk() calls throughout these DT parsing helper functions to dump out a lot of debug information to assist in development.
Feb 20 17:52:29 <hendersa> Once you see what the existing functionality is, you can then decide what you might need to add to support what you are trying to do.
Feb 20 17:53:22 <hendersa> I have not looked into that particular project very much, but Robert (rcn-ee) is good about helping people, and it is his project.
Feb 20 17:53:26 <puranjaymohan[m]> The project page states that usb is configured by a script at boot time and it's functionality has to be added through device tree ahead of boot.
Feb 20 17:54:09 <puranjaymohan[m]> Which script does the usb configuration at boot time?
Feb 20 17:54:09 <puranjaymohan[m]> Is it the one you shared?
Feb 20 17:55:53 <hendersa> The file I linked is for source code within the USB driver in the kernel.
Feb 20 17:56:37 <hendersa> I'm not sure which script in particular Robert was referring to.
Feb 20 17:57:00 <puranjaymohan[m]> Yeah, my bad, it is the driver file.
Feb 20 17:57:01 <puranjaymohan[m]> So how can I contact Robert?
Feb 20 17:58:10 <hendersa> He reads the beagleboard-gsoc mailing list, which is where you can post messages to ask specific questions.
Feb 20 17:58:18 <hendersa> https://groups.google.com/forum/#!forum/beagleboard-gsoc
Feb 20 17:59:17 <kaustubhshan27[m> Sorry to interrupt for a bit.
Feb 20 17:59:18 <kaustubhshan27[m> Hey guys, I'm interested in the project "Porting am335x_pru_package to remoteproc" and looking to contribute to it.
Feb 20 17:59:25 <kaustubhshan27[m> Can anyone expand a bit more on the project and give me a starting point to dig deeper?
Feb 20 18:00:24 <hendersa> There are two ways to interface with the PRU: Userspace I/O (UIO) and remoteproc. The existing "here's how to use the PRU" package (am335x_pru_package) uses UIO.
Feb 20 18:00:37 <hendersa> UIO is the old way. Remoteproc is the new way.
Feb 20 18:01:05 <hendersa> So, we'd like to make the sample examples work with remoteproc so that people have an easy way to begin using it.
Feb 20 18:01:41 <hendersa> https://github.com/beagleboard/am335x_pru_package
Feb 20 18:04:06 <kaustubhshan27[m> At the moment I'm going through https://www.kernel.org/doc/html/latest/driver-api/uio-howto.html to learn more about UIO. Is there any other material I can go through that can help me?
Feb 20 18:05:03 <hendersa> https://jumpnowtek.com/beaglebone/Working-with-the-BeagleBone-PRUs.html
Feb 20 18:06:59 <kaustubhshan27[m> Thanks alot!
Feb 20 18:08:36 <hendersa> zeekhuge[m] also has used PRU remoteproc a bit with Beaglescope.
Feb 20 18:09:19 <hendersa> https://github.com/ZeekHuge/BeagleScope
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