九破素食

arm-elf -gcc is for standalone application. arm-linux-gcc is for application running on Linux. These two toolchains are almost same, except for different macros defined when preprocessing and different libraries linked in when performing linking.

上午kvm能正常在板子上运行了，并且还解决了preverify的问题（感谢一下陶老师的帮助和提醒），今天一并完整的写出来整个过程吧

1. 建立交叉编译环境：

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搞了大半学期的东西！竟然不能运行！ft！要加油了！