Greetings Robert, Thanks a million for your help (and for being such an asset to the community in general). While I've been programming for a while, I'm pretty new to Linux embedded (and Linux in general). As for what overlays are available within the Kernel, is that a 'dig through the source to learn about it' proposition, or are they all documented somewhere? Can you point me towards good learning material either way? I've found plenty of device tree introductions and high level overviews, but nothing that details them exhaustively. Since the device tree and overlays seem like their own programming language, it would be nice if the dtc compiler had a good manual, and if there was some good comprehensive documentation/examples. Maybe I just haven't dug enough...
Another minor question, is it possible to enable one of the dmtimers (4-7) PORGPOCFG pin output by way of just the device tree? Thanks again, Bill On Tuesday, August 18, 2015 at 3:17:18 PM UTC-4, RobertCNelson wrote: > On Sun, Aug 16, 2015 at 7:25 PM, Bill M <billme...@gmail.com <javascript:>> > wrote: > > Hi All, > > > > Can anyone tell me where the device tree overlays for the PWM are > stored? I > > found a post that described how to enable the PWM outputs by doing: > > > > modprobe pwm_test > > echo am33xx_pwm > /sys/devices/bone_capemgr.9/slots > > echo bone_pwm_P9_14 > /sys/devices/bone_capemgr.9/slots > > echo 500 > /sys/devices/ocp.2/pwm_test_P9_14.*/period > > echo 250 > /sys/devices/ocp.2/pwm_test_P9_14.*/duty > > > > This works for me, but I expect that there would be an > am33xx_pwm-00A0.dtbo > > file and a bone_pwm_P9_14-00A0.dtbo file in /lib/firmware, but not only > do I > > not find such overlays in this directory, I can't find them anywhere on > my > > system! What am I missing? > > > > my uname output: Linux beaglebone 3.8.13-bone70 #1 SMP Fri Jan 23 > 02:15:42 > > UTC 2015 armv7l GNU/Linux > > They are built-into the kernel "vmlinux".. > > Regards, > > -- > Robert Nelson > https://rcn-ee.com/ > -- 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. For more options, visit https://groups.google.com/d/optout.
