This can be seen as a remedy to the vast number of forks (of Linux and Das U-Boot) that have historically been created to support (marginally) different ARM boards. The Linux kernel for the ARC, ARM, C6x, H8/300, MicroBlaze, MIPS, NDS32, Nios II, OpenRISC, PowerPC, RISC-V, SuperH, and Xtensa architectures reads device tree information on ARM, device trees have been mandatory for all new SoCs since 2012. Given the correct device tree, the same compiled kernel can support different hardware configurations within a wider architecture family. Nodes contain properties and child nodes, while properties are name–value pairs.ĭevice trees have both a binary format for operating systems to use and a textual format for convenient editing and management. The Devicetree specification is currently managed by a community named, which is associated with, among others, Linaro and Arm.Ī device tree can hold any kind of data as internally it is a tree of named nodes and properties. 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. As an example, Das U-Boot and kexec can pass a device tree when launching a new operating system. 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. Personal computers with the x86 architecture generally do not use device trees, relying instead on various auto configuration protocols (e.g. Is targeted at smaller systems, but is still used with some server-class systems (for instance, those described by the Power Architecture Platform Reference). The device tree was derived from SPARC-based computers via the Open Firmware project. 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. Not to be confused with Device file system.
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