they need only enable an option in the uboot .config and disable another one... but i asked about in march 2016 when i had the 5020 ... now we are in september 2017 and:
uboot is the 2014 version.
nothing change about L3 options.
Uboot integrate the varisys Cyrus config in mainstream github :
shot

[ Edited by tlosmx 11.09.2017 - 14:11 ]