Devicetree information

In computing, a devicetree (also written device tree) is a data structure describing the hardware components of a particular computer so that the operating system's kernel can use and manage those components, including the CPU or CPUs, the memory, the buses and the integrated peripherals.

The device tree was derived from SPARC-based computers via the Open Firmware project. The current Devicetree specification^[1] is targeted at smaller systems, but is still used with some server-class systems (for instance, those described by the Power Architecture Platform Reference).

Personal computers with the x86 architecture generally do not use device trees, relying instead on various auto configuration protocols (e.g. ACPI) to discover hardware. Systems which use device trees usually pass a static device tree (perhaps stored in EEPROM, or stored in NAND device like eUFS) to the operating system, but can also generate a device tree in the early stages of booting. As an example, Das U-Boot and kexec can pass a device tree when launching a new operating system. On systems with a boot loader that does not support device trees, a static device tree may be installed along with the operating system; the Linux kernel supports this approach.

The Devicetree specification is currently managed by a community named devicetree.org, which is associated with, among others, Linaro and Arm.