Well, I though I had a solution. I switched from the 4.9 kernel to 4.4 bone$ *uname -a* Linux bone-5eca 4.4.91-ti-r137 #1 SMP Tue Nov 7 01:13:03 UTC 2017 armv7l GNU/Linux and I still can't unexport the pins I want for the LCD. bone$ *sudo bash* bone# *echo 116 > unexport* bash: echo: write error: Invalid argument
I'm not sure what to try next. --Mark On Wednesday, November 29, 2017 at 9:24:39 PM UTC-5, Yoder, Mark A wrote: > > I can't unexport them. > > > root@bone-5eca:/sys/class/gpio# echo 116 > unexport > bash: echo: write error: Invalid argument > > > --Mark A. Yoder, PhD > Electrical and Computer Engineering > Rose-Hulman Institute of Technology > 812-233-3219 > ------------------------------ > *From:* Robert Nelson <[email protected] <javascript:>> > *Sent:* Wednesday, November 29, 2017 9:22:10 PM > *To:* Beagle Board; Mark Yoder > *Subject:* Re: [beagleboard] Is cape manager obsolete? What about device > tree overlays? > > On Wed, Nov 29, 2017 at 8:08 PM, Mark A. Yoder <[email protected] > <javascript:>> wrote: > > I see that if I edit /boot/uEnv.txt and comment out: > > #enable_uboot_cape_universal=1 > > I can then access all sorts of gpio pins. But now I can't run config-pin > on > > them since there is no pinmux entry in /sys/devices/platform/ocp. > > > > Is there a way to free up a few gpio pins to drive the LCD and keep the > rest > > pinmux-able? > > I'm not sure why it's broken now, but you should be able to un-export > all those pins to drive the LCD, Jason's done it before.. > > 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/935cec68-17ca-4c56-b11c-564b322384f6%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
