学习嵌入式要打好基础，弄懂基本的硬件接口gpio，在和硬件平台打交道中就不怕了-The learning embedded to lay a solid foundation to understand the basic hardware interface gpio not afraid of dealing and hardware platforms

provides a solid introduction to the Linux operating system. As its title suggests, it will give you the essential knowledge to begin using and managing this powerful operating system (OS), which is an important one in today’s computing world