写了一个很简单的内核！只是在屏幕上打印“hello,world”但分析此代码，可详细了解系统的引导过程，以及可以编写UCOS的系统引导程序-was a very simple core! Only on the screen print "hello, world" but this code analysis, a detailed understanding of the system can guide the process and be prepared to guide the system UCOS procedures