BootLoader

说明：  这是一篇通俗易懂的文章,它以最简单的语言来描述了bootloader的要意,是一篇不错的文章,很合适初学嵌入式的朋友.
(This is a user-friendly article, it is the most simple language to describe the bootloader to be Italian, is a good article, it is suitable for embedded beginner friends.)