I have the a20-dimensions.png but this does not reference either the mounting holes or GPIO1, GPIO3 and the centrelines of quite a few other connectors.
Please could you tell me where to get it from?
I tried to import the brd file from your GitHub files into KiCAD v5 with no success.
Thanks
Andy.
I've uploaded some dimensions for revision M here:
https://i.imgur.com/nvDHH66.png
The board design of A20-OLinuXino-MICRO was made with old Eagle CAD software (back when there was a very nice free trial version that allowed accessing but not modifying design files), as explained in chapter "7.1 Eagle schematic" on page 46 of the user's manual here: https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO/resources/A20-OLinuXino-Micro.pdf
Importing complex Eagle CAD projects into any other CAD software is bound to lead to some errors. If you wish to take measures you would need to use Eagle CAD.
Great - just what I needed!
Thanks
Andy.