Sorry, I'm using # uname -a Linux beaglebone 4.1.12-bone-rt-r16 #3 Mon Jan 9 19:44:59 PST 2017 armv7l GNU/Linux
# lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 8.7 (jessie) Release: 8.7 Codename: jessie On Thursday, March 30, 2017 at 12:21:48 PM UTC-7, Justin Pearson wrote: > > I wrote pasm code that has the PRU set up a 10%-duty-cycle 33kHz square > wave using PWM on the ehrpwm1B peripheral (which maps to P8_34 in mode 2). > > It worked on the 3.18 kernel but doesn't work on 4.1.12. > > When my C code tries to start the PRU code, prussdrv_open returns -1 (bad). > > I think the problem is related to the device-tree. I'm using the overlays: > > - am33xx_pwm > - bone_pwm_P8_34 > - EBB-PRU-Example (from Derek Molloy's book) > > When loading EBB-PRU-Example, I get a "No children" message from the > pruss_uio subsystem: > > [ 3822.302571] bone_capemgr bone_capemgr: part_number 'EBB-PRU-Example', > version 'N/A' > [ 3822.302633] bone_capemgr bone_capemgr: slot #8: override > [ 3822.302671] bone_capemgr bone_capemgr: Using override eeprom data at > slot 8 > [ 3822.302713] bone_capemgr bone_capemgr: slot #8: 'Override Board > Name,00A0,Override Manuf,EBB-PRU-Example' > [ 3822.308128] gpio-of-helper ocp:gpio_helper: ready > [ 3822.308324] bone_capemgr bone_capemgr: slot #8: dtbo > 'EBB-PRU-Example-00A0.dtbo' loaded; overlay id #2 > [ 3822.402747] pruss_uio 4a300000.pruss: No children > > Also, my 4.1.12 kernel didn't seem to include the bone_pwm_P8_34 overlay > (so I found it online). Is bone_pwm_P8_34 the "old way", and the "new way" > involves loading the "universala.dts" overlay and then using the config-pin > script? > > Here is my code: > > https://www.dropbox.com/sh/0mk6g4bd12spp9x/AAArsHYddApMdMWgKb4PbtcHa?dl=0 > > The 'build-and-run.sh' is how I compile and run everything. > > I'd really appreciate any help -- either with this specific problem, or > resources for debugging problems with device-tree overlays. I'm a > control-theory guy, not a kernel guy, but I'm happy to learn. > > Thanks, > Justin > -- 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/86e1bab9-8993-4344-afd3-df2c30f5f551%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
