In this page https://www.olimex.com/wiki/A20-OLinuXino-LIME2
The link <instructions and files at the githup page> seems to be no longer active in github. Right ?
Thank you for the e-mail! That link is fixed now.
Check here for A20 build instructions:
Wheezy: https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A20/A20-build-3.4.90
Jessie: https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A20/A20-build-3.4.103-release-2
Best regards,
Lub/OLIMEX