ARM Linux为什么要引进Device Tree

1. 原因

A lot of very similar C code to support each and every board.



Linux kernel老的Probing机制



关键是：
要提供一个board file，用于registers SOC的各个设备.
要提供一个SOC file

因此，引入Device Tree：
separate a large part of the hardware description from the kernel sources.

2. Device Tree
此概念：源自Open Firmware，在PPC 平台，已使用很长时间！
The Device Tree is a tree of nodes.
Describing the different hardware components of a system and their characteristics.
使用一种特殊语言来书写.
通过Device Tree Compiler编译为Device Tree Blob.
.dts files for boards.

.dtsi for include files.

示例：



3. Device Tree用法