Rasclock (PCF2127 ) Hardware Clock FreeBSD 12.0

[Stefan Parvu]

Now I have tested with and without RTC installed. The problem is clear related with 
the rasclock 4.0 which is installed on the RBPI. It simple not keeping up the time. 
If I remove the RTC and keep on the table and re-insert it then the time shows up 
correctly even for longer periods of time.

Something is making the rasclock 4.0 waste energy and not keeping up the time correctly
when it is installed on the RBPI.

Next: I will pick up today from postal office the rasclocks 4.2 and will repeat the tests
using the new clocks. 

Stefan Parvu
sparvu at kronometrix.org



> On 20 Jul 2019, at 5.24, Stefan Parvu <sparvu at kronometrix.org> wrote:
> 
>> 
>> Hmm. I could test first this one. I could set and fix the time. The power off
>> the thing for coupld of hours or until morning and then plug it back to my
>> board and check if there is any difference. thats a good point.
>> 
> 
> RTC disconnect / re-connect after 5hrs - the RTC has been unplugged from the board
> for 5hrs+. After I reconnect the RTC to the board, power on the system I can see that
> the time is correctly retrieved from the RTC. 
> 
> $ dmesg | grep nxp
> nxprtc0: <NXP PCF2129 RTC> at addr 0xa2 on iicbus0
> nxprtc0: registered as a time-of-day clock, resolution 0.015625s
> 
> So, I can repeat this test to real make sure this is consistent. But something is making the
> RTC device to lose time when is installed on the board.
> 
> Stefan
> _______________________________________________
> freebsd-arm at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-arm
> To unsubscribe, send any mail to "freebsd-arm-unsubscribe at freebsd.org"