CODEC support for s3c2440

Hi, 

I am using s3c2440 with linux 2.6.30. The camera driver for s3c2440 
currently supports preview mode. Should I enable my camera to RGB 
configuration to interface with the processor ? 

The camera device also gives YCbCr output.How can I configure 
the processor to see the YCbCr output from the camera ? Is it 
necessary that I should enable the codec mode of the s3c2440 
camera controller to get the YCbCr output.

What is the advantage of using codec path of the camera 
controller with respect to the preview path ? 

Thank You