fan continously runs on kernel 5.8 but I need to use 5. kernel for PCIe sata card
10-20-2020, 10:38 AM
You can apply the overlay a few different ways - you can use the fdtoverlay tool from the device-tree-compiler package to take the base .dtb and the compiled overlay and write the result to a compiled flat device tree:
... then use the base_with_overlay.dtb to boot.
Or you can get U-boot to load and apply it in-memory during boot - it sounds like Armbian supports this for Allwinner but maybe not for Rockchip? I have not been using Armbian so I don't know the details of how this works. I use a custom U-Boot script to apply the overlays using the fdt apply command.
Whether or not this is better than running the fan constantly depends on what you want - I have an open case with the fan mounted on the CPU heatsink, so it makes sense to control it according to the CPU temperature reading. It is normally off unless I'm compiling something using all 6 cores. For your use-case, it sounds like you have the NAS case and so maybe have the fan mounted on the case, not the CPU heatsink, and the fan is cooling not only the board but some HDDs, so maybe it is better to run the fan all the time to cool the whole case - depends what you think really.
Code:
fdtoverlay -i base.dtb -o base_with_overlay.dtb overlay.dtbo... then use the base_with_overlay.dtb to boot.
Or you can get U-boot to load and apply it in-memory during boot - it sounds like Armbian supports this for Allwinner but maybe not for Rockchip? I have not been using Armbian so I don't know the details of how this works. I use a custom U-Boot script to apply the overlays using the fdt apply command.
Whether or not this is better than running the fan constantly depends on what you want - I have an open case with the fan mounted on the CPU heatsink, so it makes sense to control it according to the CPU temperature reading. It is normally off unless I'm compiling something using all 6 cores. For your use-case, it sounds like you have the NAS case and so maybe have the fan mounted on the case, not the CPU heatsink, and the fan is cooling not only the board but some HDDs, so maybe it is better to run the fan all the time to cool the whole case - depends what you think really.
