[Verse 1] Before device trees came to save the day Platform code was hardcoded every way Each board needed custom kernel patches Bootloaders and drivers, mismatched batches GPIO pins and interrupt lines Memory maps in scattered defines [Chorus] Device trees describe the silicon blueprint Hardware abstraction, kernel footprint Nodes and properties, parent-child relation Boot-time discovery, hardware translation DTS files compile to DTB binary One kernel fits all, no more arbitrary [Verse 2] Flattened device tree blob gets passed along From bootloader to kernel where it belongs Compatible strings match drivers to devices Interrupt controllers, clock sources, bus slices Address cells and size cells define the space Memory-mapped registers find their place [Chorus] Device trees describe the silicon blueprint Hardware abstraction, kernel footprint Nodes and properties, parent-child relation Boot-time discovery, hardware translation DTS files compile to DTB binary One kernel fits all, no more arbitrary [Bridge] Overlays let you modify at runtime Hot-plug devices, reconfigure on the fly Status equals okay means device is active Disabled nodes stay dormant, inactive Phandles reference other nodes by name Making connections in the hardware game [Chorus] Device trees describe the silicon blueprint Hardware abstraction, kernel footprint Nodes and properties, parent-child relation Boot-time discovery, hardware translation DTS files compile to DTB binary One kernel fits all, no more arbitrary [Outro] From embedded ARM to server grade machines Device trees power modern computing scenes Hardware description, vendor independent Platform evolution, future-transcendent
← Device Trees for Hardware Description | Device Tree Source Syntax Basics →