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外部RTC DS1307 内核初始化问题



dm368,取消了内部 davichi的rtc,使用外部rtc ds1307,i2c接口

内核初始化的时候,有时可以正常初始化,hwclock -r 和 -w 都ok,有时启动失败

drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

i2c的frequency设置为100k,示波器probe显示也和设置的差不多

请问,这个可能的原因是什么 ? 谢谢