1.CONFIG_OF

在一些驱动中经常看到#ifdef CONFIG_OF，这里的OF是Open Firmware。

Open Firmware. This was invented long time ago when Apple was producing laptops based on PowerPC CPUs. Openfirmware provides a good description of the devices connected to the platform. In Linux kernel the part that works with device data is called Device Tree (DT). More details in the .

详细参考kernel\Documentation\devicetree\usage-model.txt