How to add LCD support in L138

Other Parts Discussed in Thread: OMAPL138

I've a OMAPL138 board ( not EVM ) and I can boot the linux kernel now. But the LCD is not open. So I want to add LCD support in U-Boot & the kernel. First, I add the RASTER_init function in the u-boot. and the LCD seems light, but it always blinking. and the picture is also wrong. e.g. I want to show: RRRGGGBBBB RRRGGGBBBB RRRGGGBBBB It may show RRRGGGBBBB RRGGGBBBBR RRGGGBBBBR And when unpressing kernel is done, the LCD close again. How could I add the LCD in kernel? I don't know which folder should I modify. Thanks