Hello, based on this description I have the following now, think the device tree should work. Interesting is, I have to send echo RoboticsCape > /sys/devices/platform/bone_capemgr/slots &
in background, otherwise the prompt is gone. But system is still working. cat /sys/devices/platform/bone_capemgr/slots 0: PF---- -1 1: PF---- -1 2: PF---- -1 3: PF---- -1 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,RoboticsCape I modified the RoboticsCape for pin40 ... pin43 mode5 outputs. Then compile and result is copied into /lib/firmware. Hope it still works after reboot. The pins are outputs now. pin 40 (44e108a0.0) 00000025 pinctrl-single pin 41 (44e108a4.0) 00000025 pinctrl-single pin 42 (44e108a8.0) 00000025 pinctrl-single pin 43 (44e108ac.0) 00000025 pinctrl-single pin 44 (44e108b0.0) 00000025 pinctrl-single pin 45 (44e108b4.0) 00000025 pinctrl-single pin 46 (44e108b8.0) 00000025 pinctrl-single pin 47 (44e108bc.0) 00000025 pinctrl-single Hope it's correct. Next is compile my sources, because gcc complains -lprusdrv is not available and so on. The pru C-Code compiles without errors. Any idea what is still missing? Thanks Kasimir Am Dienstag, 5. September 2017 18:55:37 UTC+2 schrieb Kasimir: > > I want to use the HDMI outputs to drive external circuit. Required toggle > rate is between 1MHz and 10MHz. > Have BB black. > uname -a > Linux beaglebone 4.4.84-ti-r120 #1 SMP Sun Aug 27 03:11:07 UTC 2017 > armv7l GNU/Linux > cat /etc/debian_version > 9.1 > So I have to use the PRU unit. > I was searching example to have a starting point. > But it sucks already with the first step. > > ll /sys/devices/bone_capemgr* > ls: cannot access '/sys/devices/bone_capemgr*': No such file or directory > > I load the image from here: > http://debian.beagleboard.org/images/bone-debian-9.1-iot-armhf-2017-08-31-4gb.img.xz > > What is my mistake? > Device tree compiler is up to date > device-tree-compiler is already the newest version (1.4.4-0rcnee3~stretch+ > 20170719). > 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. > > Found a lot of hints to use the 3.8 kernel. Think that one is already some > years old, can't be true. > > Question: How to create the required device tree overlay, because /sys/ > devices/bone_capemgr* is not existing? > > Thanks for help > > > > > -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/7b3fd698-aadb-482a-8204-e8df7e47e610%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
