[Verse 1] When your ARM board boots up clean and new The kernel needs to know what hardware's true No hardcoded paths or magic calls Device tree describes it all Memory maps and interrupt lines GPIO pins and clock defines A structured file tells the tale Of every chip without fail [Chorus] Device tree source becomes device tree blob D-T-S to D-T-B does the job Compile it once, the kernel reads Every component and what it needs Nodes and properties, parent-child Hardware topology reconciled [Verse 2] Start with compatible strings that name Each device driver's matching game Status okay means it's alive Disabled means it won't survive Registers mapped to memory space Base address sets the place Size and range define the bounds Where each device can be found [Chorus] Device tree source becomes device tree blob D-T-S to D-T-B does the job Compile it once, the kernel reads Every component and what it needs Nodes and properties, parent-child Hardware topology reconciled [Bridge] Phandles link between the nodes References down different roads Interrupt parent points the way To controllers that handle the fray Bootloader passes the tree along Kernel parses right or wrong Platform devices come alive When descriptions help them thrive [Verse 3] Overlays let you modify Runtime changes on the fly Without recompiling all Just the pieces you install From source to binary form Device tree compiler transforms Human readable to machine code Hardware discovery mode [Chorus] Device tree source becomes device tree blob D-T-S to D-T-B does the job Compile it once, the kernel reads Every component and what it needs Nodes and properties, parent-child Hardware topology reconciled [Outro] No more hardcoded board files Device trees bring flexible styles ARM and embedded platforms shine When hardware description's defined
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