On 8/4/2015 12:36 PM, Nicholas Piegdon wrote: > Thanks for the super fast reply, Charles! (And thanks for > beaglebone-universal-io. It makes development on the BBB > actually-approachable!) > > I have access to the device now, so here is the real error message: > > (This is after a reboot, make, make install, and echoing the universal cape > to the cape manager) > > # ./config-pin -a P9_42 ecapin > bash: line 0: echo: write error: No such device > > Tracking it down a bit, I can produce the same message by doing what > config-pin is trying to do: > > /sys/devices/ocp.3/P9_42_pinmux.47# echo ecapin > state > bash: echo: write error: No such device > > So now my question is which magic word does "state" want to see? (Things > like "gpio" and "pwm" work just fine there.) I had picked "ecapin" to try > and match the style of the other names. Is there a premade identifier > someplace that has to be used instead or is that free-form text that just > has to match the line in dts?
It just has to match what you put in DTS. > Is this something that needs to be added to the kernel before it will work? > (I'm using 3.8.13-bone73.) My guess is you're actually using the unmodified overlay and not your tweaked version. If so, you're tripping over the pre-compiled DT overlays included in the kernel. The workaround is to rename your modified *.dtbo overlay file to something new so it won't be found in the compiled-in list and the kernel will look for the file in /dev/firmware. ...or update the kernel source and build a new kernel. ;-) -- Charles Steinkuehler char...@steinkuehler.net -- 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.
