嵌入式ARM的uboot启动源代码,支持USB烧写，支持yaffs，支持tftp，支持自己更新开机logo等特性-Embedded ARM' s start uboot source code, support for USB programmer, support yaffs, supports tftp, boot logo, etc. to support their updated features

移植好的ucos工程代码，可以直接使用，适合新手(Transplant UCOS project code, can be used directly, suitable for beginners)