Didn't know, that there are people who are interessted in this device besides me
I did this GitHub - knaerzche/LibreELEC.tv: Just enough OS for KODI some days ago ... If you know how to build LE, this is your thing.
Other than current LE buildsystem it uses (almost) latest Rockchip 4.4 kernel and (almost) latest mpp. Currently there are 4 supported TV boxes: a95rx1, hk1mini, d88 (hdmi-stick), v884k and v88mars. If your device isn't listed v88mars build should work on all devices ... LE is working great besides one very anyoing bug: Exactly 10 minutes after startup the screen starts flickering - you'll have to login via ssh a restart kodi - after that its running for days or weeks without interruption. It working soooooo much better and faster than android on these boxes ... comparable to Allwinner H3. Don't expect to much according to HEVC-4k-10bit streams ... its working but almost always the sound isn't in sync. 8bit works great ... and: no HDR at all
See https://github.com/knaerzche/libreelec.tv/tree/master/projects/rockchip/devices/rk322x for build instrucations
Very interesting, must have been a lot of work.
I will try to built it.
I have a AP6255 wifi device so will try to see if an existing dtb works and try to modify it.
Hope you can fix the flickering, maybe updating to the latest kernel, libmali, drm fixes it?
Maybe there are also changes from joern-p that improves things on rk322x?
RK322x hardware unfortunately doesn't support HDR or fractional frequencies, otherwise it could have been the cheapest devices to run LibreELEC on with most features available.