n most cases, this situation occurs because the GPIO is short-circuited to GND. It could be related to the connection with the peripheral device, or it might be a short circuit on the PCB.


I sincerely apologize. I checked the circuit and found a short to ground, which I have fixed. It is now ...

Buildroot in flash.
I tried the following commands:
# echo 2 > /sys/class/gpio/export
# echo out > /sys/class/gpio/gpio2/direction
# echo 1 > /sys/class/gpio/gpio2/value

Although these commands work for GPIO14 and GPIO55, they have no effect on GPIO2.

When I try to read gpio2/value, it returns 0 ...