How to enable HDMI on in U-Boot on OrangePi4, rk3399?

Hello! I have OrangePi4 and it works quite well out of the box with Armbian desktop latest.

However there were some minor problems, this is the first one:

Video resolution was incorrect by default in console framebuffer. The screen is 1920x1080, but default was 1280x720. The solution is adding

extraargs=video=1920x1080@60

To /boot/armbianEnv.txt . The part after first = is passed to the Kernel command line and kernel enables the resolution.

This have fixed my problem mostly, however, the video output is enabled only during late boot. This is not a big problem, but it would be better if the screen lit up immediately after the computer is powered on, like it happens on regular PC's rather than after half of OS is already loaded.

So I am wondering, is it possible to enable HDMI video output in the bootloader, so I can see kernel early bootlog on screen? It would also be nice to enable keyboard too so I can access u-boot command line without disassembling the case.

So do you think either of this two is possible? It should help me load other operating systems as well, since I have tried to load NetBSD on my box and it works mostly, except there is no video.

Edited December 17, 20205 yr by Romulan
Minor change