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LCD config about AM3715

Other Parts Discussed in Thread: AM3715

I have a board Devkit8500A with 24 LCD datalines,

and i download omap3evm android 4.0 source code to migrate into my board,

except for timing parameter,i chaned the code form phy.dpi.data_lines= 18 to phy.dpi.data_lines=24

and  colormode RGB24U(RGB888),

I dump the register as follows 

DISPC_CONTROL=18309

DISPC_GFX_ATTRIBUTES=91

but  I found it does not work, the LCD display is still RGB666

who can tell me why?