I’m working on a project that needs quite a few gpio’s and we initially chose to use the lcd pins on P8 because we are running headless.
Currently, we are running: Linux beaglebone 4.1.17-bone-rt-r18 #1 Mon Feb 1 07:40:21 UTC 2016 armv7l GNU/Linux (because we used “–bone-rt-kernel --lts-4_1”).
When I try toggling the first few pins in the nxp_hdmi_bonelt_pins (on Derek Molloy’s spreadsheet), they don’t respond. In particular, P8_27 - P8_30 don’t change.
We originally built a custom dtb using dtb-rebuilder, but that seems to have been removed. So, we cloned https://github.com/beagleboard/bb.org-overlays and don’t know where to go from there.