这是一个fl2440 按键中断驱动文件，arm9（s3c2440开发平台），按下开发板按钮开关1，便可测试，通过cat /proc/interrupts 命令在include/arch/irqs.h 可查证。-This is a key interrupt-driven file fl2440, arm9 (s3c2440 development platform), press the button to switch a development board, can be tested by cat/proc/interrupts command in include/arch/irqs.h verifiable.