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I saw someone's post on FriendlyArm forum that RK3399 can handle only 6 CSI lanes at a time. Do you know something about it? Is it true? This is how cameras are configured in FriendlyArm kernel: https://github.com/friendlyarm/kernel-rockchip/blob/nanopi4-linux-v4.4.y/arch/arm64/boot/dts/rockchip/rk3399-nanopi4-rkisp1.dtsi#L47 I want to go from 10-bit down to 8-bit and from 30 fps to 60 fps. But I don't know which distro and kernel to choose to experiment with. FriendlyDesktop or Armbian. Does Armbian has issues with cameras on 4.4 kernel? P.S. why rk3399 kernel is 4.4.192 but source package is 4.4.179?

NanoPi M4 uses 2 lanes out of 4. Don't know about Neo4 but this is how driver configures ov4689 on M4. Some say it's because of dual camera support. Neo4 has only 1 CSI so it may use 4 lanes. But if you want one driver for all 3 NanoPi boards you have to use 2 lanes. I'm currently trying to get 60 FPS over 2 lanes on 4.4 kernel. May be I will help you with mainline driver later.