can i use this dts change dpi_output_format=6 like RPi3B？

[popyuiggg]

I tried two branches of the file，Also try to edit the dts file yourself and convert it to dtbo with dtc。But that doesn't make my rgbpi compatible board work，How can I change his output mode?
We look forward to hearing from you
Best wishes

[digitalLumberjack]

it's now compatible with the mode6 implementation:
03e76e2

dtoverlay=vc4-vga666,mode6