Ok, so I found out that fdd is the dma delay and also found the errata on 
24-bit color to lcd pin mappings.  That explains the colors being wrong.  
Still trying to find out why I can't change to 24-bit using the device tree.
 
Any ideas?
 
Brian
 

On Monday, October 7, 2013 10:31:17 AM UTC-4, [email protected] wrote:

> I have created a custom cape for a 24-bit LCD and am having trouble 
> getting the upper bits (>16) to work.  I have disabled the HDMI and on 
> board eMMC. The panel comes up but is not showing all 24-bit color.
>  
> panel-info {
>                     ac-bias           = <255>;
> Where can I find full descriptions of the data entered into a Devcie Tree. 
> I have searched for a technical reference document an cannot find one (does 
> it need to be BBB specific?)
> Here is what I am using:
>                     ac-bias-intrpt    = <0>;
>                     dma-burst-sz      = <16>; 
>                     bpp               = <24>;
>                     fdd               = <0x80>;
>                     tft-alt-mode      = <0>;
>                     stn-565-mode      = <0>;
>                     mono-8bit-mode    = <0>;
>                     sync-edge         = <0>;
>                     sync-ctrl         = <1>;
>                     raster-order      = <0>;
>                     fifo-th           = <0>;
>                     invert-pxl-clk;
> should be 24-bit output.  What does fdd mean? I'm assuming bpp is in 
> decimal and somehow getting written to the correct register.
>

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