am35xx(am3505) cvbs capture and display errror

dear, friends;

       ENV:

         AM3505/AM3517    linux 2.6.32 /2.6.37   down frome TI's  Web

      Problems:

       cvbs drv  creat /dev/video0-3  and /dev/fb0; is ok;

      vga ok :use av-example form sdk； saMmapDisplay.c   display on vga is ok(corlor bars);  

     tv display error: echo "tv" > /sys/xx/overlayx/manager  ；echo 1 > /sys/xx/overlayx/enable

    and tips on driver: set fmt error;  set display fmt return error;

    tv capture error:   run the example form sdk, tips:set input error

    We need you help,

      thanks!