TV out framebuffer uses YUV format

[befiluis]

Hi

I am working on a F1C100s board (Lichee Nano) and got the TV out working by disabling the LCD panel. However, I noticed that the data format for /dev/fb0 is strangely YUV in an unusual 32 bit configuration (the last byte is not used).

So it appears to me that in case of the TV out a color conversion from RGB to YUV is missing somewhere in the pipeline.

Is this a bug or did I just misconfigure things?