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pwm驱动问题



我使用pwm_request等函数编写了一蜂鸣器驱动,我手动加载编译好的beep.ko,使用测试程序可以正常驱动蜂鸣器,为什么我把该beep.c文件编译进内核,内核启动过程中在pwm_request申请pwm出现错误?申请不成功。