Marko Buršič Posted December 16, 2019 Share Posted December 16, 2019 When building a kernel the device driver configuration asks which rtc should a system use for NTP and startup synchronisation . By default this is rtc0. The question is: In case there are more hardware RTCs in one embedded system ( in my case onboard RK808 and Dallas DS1307 over I2C), which one would be numbered as rtc0? Threre are several RTC device drivers available and checked by default, some marked as M and other as '*' , supposing 'module' or 'driver' respectively. Now if I have two hardware RTCs, I presume they should load as rtc0 and rtc1, but which part does numbering? I can't know this 'a priori' , I would like to use DS1307 for synchronisation. Link to comment Share on other sites More sharing options...
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