Display 8HD overlay blocks use of GPIO pins on Rock 3B

#1

When I activate the overlay for the 8HD display (using rsetup) I am no longer able to initialize a number of GPIO pins at /sys/class/gpio. I get a “write error: Device or resource busy” message. I am guessing that the display is using or “making claim” to some of these pins.

Is there documentation somewhere on how the 8 HD overlay impacts the use of the GPIO pins?

#2

Theoretically, it should only affect the GPIOs used by the 8” screen dts, the other GPIOs are not affected.