Reported by Nikolaus Schaller, Dec 17, 2011

The problem is that the LCD is 640x480 while the TV is approx. 
500x700.

This requires two independent framebuffers which could be configured 
to be drivern by two different screens of the X-Server.

Some hints:

http://processors.wiki.ti.com/index.php/Dual_Frame_Buffer_on_OMAP35x