[Buildroot] graphics

[ali hagigat]

Buildroot has built a correct image for wandboard-quad and I can log
in and see the output by the serial port, ttymxc0
But i want to enable graphics for wandboard. Now getty listens for
ttymxc0, how can i change it to use HDMI monitor and keyboard/mouse?
I have enabled some X11 components and some drivers but i can only see
the output on the serial console. HDMI monitor was not drived
I will be much appreciate for any answer