How to rotate display on am335x-evm using Linux ?

Hi,

I am running arago distro (daisy branch) on am335x-evm based reference board.

How can I rotate the display by 180 degree ?

Here is the configuration:
- Linux version 3.14.49-ge9cd4cc
 - drm 1.1.0 20060810
- SGX_DDK_Linux_CustomerTI sgxddk 1.10@2359475

When I run following command, no rotation happens
echo 2 > /sys/class/graphics/fb0/rotate