unsupported Allwinner A20 board

[Pavel Tkatchouk]

Hello,
      
I have some board not listed in http://fedoraproject.org/wiki/Architectures/ARM/F22/Installation.
Attempt to run Fedora-KDE-armhfp-22-3-sda did not produce any results on display or ttyS0.
      
How can I change serial console to ttyS1? On older images one could edit uEnv.txt, but looks like
newer images don't use it anymore.
            
I would appreciate any advice on what to start from to get Fedora running on this board.
      
Thank You.