A10, A20 OLinuXino LIME and LIME2 are officially supported in Debian 8.0 Jessie

 

Debian 8.0 Jessie now supports many Allwinner boards including A10-OLinuXino-LIME, A20-OLinuXino-MICRO, A20-OLinuXino-LIME and A20-OLinuXino-LIME2!

more info you can find on https://wiki.debian.org/InstallingDebianOn/Allwinner

 

Another interesting article for using mainline Linux uboot and kernel you can read here