U-Boot HDMI console on rk3399

[Tamás Szabó]

Hello,


I read there is possible to use HDMI as console output on rk3399, but I 
do not find any documentation about this, only Google AI give some 
hints, but mostly mix up rockchip and sunxi stuff.

I have a Giada DN74 which is based on rk3399 but I am not able to enable 
HDMI output in u-boot.

I check in which defconfig is use necessary configs (|example: 
CONFIG_VIDEO_ROCKCHIP|) and which one is similar to my board, I choose 
nanopi-m4-rk3399_defconfig and build u-boot but no output.


Is the HDMI output in some rk3399  board enabled by default?

There is documentation about HDMI output in u-boot?

If not documentation, someone could please write a sort advise how to 
enable HDMI output.


Regards.

Tamás