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Is it possible to add a hardware clock to available_clocksource in order to select it as the current_clocksource found in: /sys/devices/system/clocksource/clocksource0

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I don't think the item you listed has anything to do with RTC.

I recommend DS3231. This is simple to interface, and all the drivers are included. See https://raspberrypi.stackexchange.com/a/53395/8697

I may have misinterpreted your question. If you are proposing to use RTC as a system clock, this is still not possible, as most RTC only generate low frequency clocks.

  • Yes I was proposing the use of a RTC to replace the system clock. Thank you for clarifying the possibility of this. – quarks80 Jan 19 '17 at 18:37

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