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Device Tree Overlays on Mainline

pine64.org

If your U-Boot has been compiled with CONFIG_OF_LIBFDT_OVERLAY (which Manjaro’s is), adding device tree overlays the mainline way is very simple and easy. Writing Your Device Tree Overlay First off, you’ll have to write a device tree overlay. In this example, we’ll enable the ROCKPro64’s I2C bus that’s exposed to the pin headers, and declare that a PCF8574 GPIO extender is hanging off it.

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