一个非常好的bootloader，它不同于u-boot,因为它结构非常清晰，适合初学者，同时里面也包含了好几个启动程序，也可作为驱动程序入门的开始-A very good bootloader, it is different from u-boot, because it is very clear structure, suitable for beginners, while it also contains a number of startup programs, drivers ca