Poh,
[quote user="Poh Boon Teo"]One deviation from the reference design is that I do not connect the WP pin but I do not think that is the problem.[/quote]
Have a look in the below thread, where we discuss the WP and CD pins:
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/277798/975863.aspx
BR
Pavel