如下资料中已经讲得很清楚了：
http://blog.csdn.net/dasheng_604/article/details/5976460
http://stackoverflow.com/questions/973933/what-is-the-difference-between-fiq-and-irq-interrupt-system
http://learnlinuxconcepts.blogspot.com/2014/07/what-is-difference-between-irq-and-fiq.html
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