Hi,

 

I am migrating from legacy 3.x kernel to bionic mainline 4.14 at OrangePi Zero 2 plus.

Previously there is a fex files to enable or disable some features such as onboard wifi, mali, hdmi and other. now I found no ways to disable it, overlays does not include this features. Is there any way to edit dtb files? or?

 

Thanks

A way to disable hardware is by setting its status to disabled in the device tree, take a look at " dtc -I fs -O dts /sys/firmware/devicetree/base|less" to see the runtime devicetree. For instance for sound and video this would look like below, which you can convert to dtb with something like "dtc -I dts -O dtb youroverlay.dts > youroverlay.dtb" and add as a user-overlay (place dtb file in /boot/overlay-user) and add "user-overlays=youroverlay" line in /boot/armbianEnv.txt.

 

/dts-v1/;

/ {
    compatible = "allwinner,sun8i-h3","allwinner,sun50i-h5","friendlyarm,nanopi-neo2";

    fragment@0 {
        target-path = "/soc";

        __overlay__ {

            hdmi@1ee0000 {
                        status = "disabled";
            };
            mixer@1100000 {
                         status = "disabled";
            };
            sound {
                         status = "disabled";
             };
        };
    };

    fragment@1 {
        target-path = [2f 00];

        __overlay__ {
              sound {
                         status = "disabled";
              };
        };
    };
};