Hello PRU experts, Newcomers like myself struggle getting the PRUs enabled on PocketBeagle.
(1) I've downloaded the image Debian 9.4 2018-06-17 4GB SD IoT <http://debian.beagleboard.org/images/bone-debian-9.4-iot-armhf-2018-06-17-4gb.img.xz> from website (https://beagleboard.org/latest-images) Do we have steps of what to do from this clean installion point, that would allow me to toggle a GPIO pin using a PRU? Many Thanks, Brijen On Friday, March 30, 2018 at 9:24:25 PM UTC+1, Jaremy Creechley wrote: > > > I'm working on creating a variant of a Buildroot image using the > 4.9.82-ti-rt kernel (taken from @RCN's stretch/ sources) and modified to > use u-boot overlays. The buildroot image works well on the Beaglebone Green > (with the PRU's loading much quicker than the 4.4.x branch I'd used > previously using TI's recently modified `/sys/class/remoteproc/` scheme). > > The image also boots the PocketBeagle and loads `g_ether` and boots fine. > However, it does not load the PRU units and only loads `remoteproc0` [the > omap timer (?)]. There are no `/sys/class/remoteproc/` entries for either > of the PRU units. The kernel logs don't show anything, no errors, or > anything regard the PRU units (aside from remoteproc0). > > Based on the serial output from the BBG, the U-Boot version correctly > boots using U-Boot 2018.03. Also, the u-boot based cape manager loads on > both the BBG and PB boards after some tweaking with the uEnv.txt file. > Still I have not been able to get remoteproc to load the PRU units. > > Does anyone have any suggestions? Do I need to load another cape? I've > tried setting the 4-9 PRU dtbo in `uEnv.txt` to no avail. > > I've been reading through the DTS and DTSI sources in the Linux kernel as > well as the bb.org-overlays. It seems that the linux in-tree dtsi files for > the PocketBeagle don't mention the PRUSS hardware units at all. This is in > contrast to the BBB and BBG which both set the `status` field to "ok" for > both PRU units. My suspicion based on that is that the PRUSS and remoteproc > configurations aren't updated for the PB. The bb.org overlay's also do > not mention the PB at all that I've found. However, it appears that several > people have the PRU's loading and working on the PB's. Hence my confusion! > > Thanks, Jaremy > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/0f4ed650-b692-4e3f-836e-4df02c22d12f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
