There're several; I added support for FWBADAPT in U-Boot mainline which works with The Wandboard - ultra lowcost development board with Freescale i.MX6 Cortex-A9 processor
You can see it at:
How do I interface the LCD screen F07A-0102 from future electronics? because connect the adapter and then the screen and it only turns the backlight on. I can see that my image boots, through minicom but it isn't displayed on the LCD screen.
I think I´ve modified the bootloader to support the LCD screen but it onluy turns on it doesn´t display anything. Do I need to make my yocto image support it by modifying the kernel parameters?