features i looking for is a MPP/NPU - quite decent video encoders/processing/npu engine support, unfortunateli it still sticks to vendor 6.1.y kernel.

https://github.com/armbian/build/blob/main/config/boards/bigtreetech-cb2.conf#L8 Nope. We don't support vendor kernel for other then 3588 and more recent. We don't maintain vendor kernel for this hardware (nor any other 3566 AFAIK), so it might be some work and its all on you. Mainline support is very mature, however I don't know about the status of specific features you are interested in. IMO its not worth going vendor route on this hw.

At this point, the most realistic path is to use hardware that is already officially supported. Bringing up new hardware or maintaining outdated vendor kernels requires significant engineering time and resources. Board enablement is not a small task. It involves ongoing maintenance, testing, integration work, and long-term support. This represents real cost for the project while public project funding is not even on the level to cover response of such ideas. If you are expecting someone will just emerge and spent months of his private time in exchange for: constant insults, hate and complete absence of financial coverage for the time spent (things are never in perfect state to satisfy over-spoiled customers of someone else) ... adjust expectations. We encourage users to choose hardware wisely - that already has active support and to contribute back to the project when possible. That is the only way we can avoid overextending limited resources, burnouts, collapse.

Hi all i tried to compile BTT CB2 with bookworm and vendor kernel to get MPP and NPU working, but got that : sha256sum: config/kernel/linux-rockchip64-vendor.config: No such file or directory is it missed ? How to compile vendor kernel for MPP support? thanks

Hello @Igor Yeah, I know that there is no simple way to achieve this. Hopefully someone will support this board or providing a newer kernel image, but as more time pass, as more difficult it become. Regards,