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