Parameters marked as “Required” have to be set if overlay with these parameters is activated, other parameters are not mandatory if default value is suitable. Some overlays have additional parameters that can be set. Reboot is required for any changes to take effect.If activated overlays have parameters marked as “Required”, those parameters have to be set to proper values.Multiple names should be separated by space.No more than one overlays line and one user_overlays line can be present in the environment file.User provided overlays are activated by adding a name to the user_overlays variable.Kernel provided overlays are activated by adding a name to the overlays variable.for file adafruit13m.dtbo overlay name would be adafruit13mĭT overlays are activated by editing u-boot environment file /boot/armbianEnv.txt User provided overlays are activated by the file name (excluding the extension), i.e.User provided overlays directory is empty by default and is meant for storing and using user created overlays that are not present in the kernel packages or modified stock overlays.i2c0), and the prefix is set at OS image creation time Kernel provided overlays are activated by the overlay name (i.e.Kernel provided directory may contain overlays for different SoCs, so overlay file name pattern will be -, for example sun8i-h3-i2c0.dtbo, where sun8i-h3 is the prefix and i2c0 is the name.Kernel provided overlays are updated with the kernel packages, any changes to this directory (including new files) will be lost on kernel upgrade.Main differences between these locations: /boot/overlay-user/ - user provided overlays./boot/dtb/overlay/ ( /boot/dtb/allwinner/overlay/ for 64-bit SoCs) - kernel provided overlays.Kernel provided vs user provided overlays ¶ user_overlays - list of overlays to activate from /boot/overlay-user/ directory.overlays - list of overlays to activate from kernel directory.
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