Enable S-video Beagle board Xm RevC

Hai Every one

I am Haris I am using beagle board xm rev c with kernel 2.6.32 which
is pre-installed with the card when a get the beagle board.

For my I don't have a dvi monitor so I need to enable S-video

By referring some post I edited the content of uEnv.txt as

mpurate=1000

defaultdisplay=tv
omapfb.mode="tv:ntsc omapdss.def_disp=tv"
vram=16M
optargs="consoleblank=0"
console="tty0 console=ttyS2,115200n8"

But I got only the console out put on the s-video output. That is like
as we login through minicom. I can enter the command through key board
connected to the beagleboard. But no desktop environment.
I am using the latest u-boot cross-compiled from my pc.

Please help.............