DSS2: How to test TV and LCD output simulatenously

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Hi,
I have DSS2 ported on LDP board, I could manage to get output display on TV and LCD interface individually, also tested some of the features like Rotation and Mirroring, they worked with out any problem.
Now I am trying to get output both on TV and LCD simultaneously, 

I was not successful with my approach that I tried, like

1. Boot the kernel with the default LCD display
2. Then I enabled ntsc timings for TV, as PAL do not work on it. 
    #echo ntsc > /sys/devices/platform/omapdss/display1/timings
3. Enabled TV
  # echo 1 > /sys/devices/platform/omapdss/display1/enable
and did the common fb test....
But it did not seem to work.
Its nice if someone has different working approach or can suggest me where I am going wrong in the above steps.

Regards,
Subbu

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