PC3 pin unavailable as GPIO

[pac]

Hi All,
I'm using an A20 Olinuxino LIME with A20-OLinuXino-bionic-base-20201008-190649 image.
Trying to export the PC3 pin to use them as GPIO, I get that this pin is busy (already used ?).

How can I get PC3 pin available as GPIO ?

(in the past I got that pin available for GPIO modifying the FEX file.)

Many thanks in advance
Paolo

[martinayotte]

What output is provided by "cat /sys/kernel/debug/gpio" command ?
You will probably see what is currently using PC3 ...

[LubOlimex]

https://www.olimex.com/forum/index.php?topic=7737.msg29740#msg29740