@olimex
I wonder if the pinout marking 1,2,3,..,40 for GPIO-2 inside your photo of A20 board is correct.
I guess the numbers should be flipped horizontally... i.e. from right to left like 40,39, ...., 3,2,1 - not?
https://www.olimex.com/wiki/File:Example.jpg
I think you're right.
:)
On the same photo the UEXT2 pins should also be flipped horizontally.