做个最小系统板：如果你从没有做过ARM的开发，建议你一开始不要贪大求全，把所有的应用都做好，因为ARM的启动方式和dsp或单片机有所不同，往往会遇到各种问题-Be the smallest system board: If you have not done the development of ARM, I suggest you start贪大求全not all applications have to do a good job, because ARM