Can the OPI5 be Configured to Run LCNC?

Perhaps compiling without the Armbian build system will be easier in this case.
After installing the kernel it might be that the symlinks aren't correct in /boot
ls -ltr /boot  will show you the newest files at the end. When necessary, force overwrite new symlinks like for example:
sudo ln -sf vmlinuz-5.10.180-rk35xx-rt vmlinuz.

This is the result with the 5.10.160 rt-kernel of Orange Pi. I was able to compile it with the config in the attachment. Afterwards you'll need to copy the compiled DTB manually to /boot/dtb/rockchip otherwise it won't boot.

That is really impressive.

@royka:
Thanks for your config, works great!

After a lot of work and patching, I could get the Xunlong RT kernel to compile in the armbian build system
Now I can compile on my somewhat fast PC and get a bootable image out of it.
Even the "official" OPI5 10.1" display works.

I still have to do some customizations to the build system (add LCNC, display rotation script, etc. to the image) and check why the HDMI output does not work when enabling the display...

If anyone needs the patch for the armbian build system, let me know

Great to hear you've got it working!
Perhaps the DP output via USB-C will work, but keep in mind that you cannot use the vertical USB port when you use the USB-C port.

Although you don't use the base thread when you use a hardware stepgen I wonder why yours is a bit higher, because my result was after I opened
Chromium with YouTube first (also an OPi5 instead of the plus in contrast of what the screenshot shows). Perhaps you ran it from a SD or without cooling? Anyway when you'll use a hardware controller over ethernet you might wanna look some of the previous messages about moving the IRQ of the ethernet controller.

The OPi is cooled, but I am still using my (old and pretty slow) SD card.
Currently the CPU is 66°C warm (don't know if that is already too much)
I will try installing the system to my SATA SSD, and try again

I plan to use my own FPGA card with the machine, but that is a story for another post or thread...