Rasclock (PCF2127 ) Hardware Clock FreeBSD 12.0

[Stefan Parvu]

It seems the battery is a real pain in this model. I cant figure out any vendor. 
Tried already 3 models. All do not keep the time. 

root at k1:~ # dmesg | grep nxp
nxprtc0: <NXP PCF2129 RTC> at addr 0xa2 on iicbus0
nxprtc0: WARNING: RTC battery failed; time is invalid
nxprtc0: registered as a time-of-day clock, resolution 0.015625s
nxprtc0: RTC clock not running

It seems the battery must be 36mAh. But even so some new model I got
does not work. Damn. 


Stefan Parvu
sparvu at kronometrix.org



> On 18 Jul 2019, at 4.52, Stefan Parvu <sparvu at kronometrix.org> wrote:
> 
>> 
>> Why does it claim to have found a PCF2129 when the rpi i2c overlay only
>> has an entry for 2127?  The driver will believe whatever is in the dts
>> compatible string, it has no way to ask the chip at runtime what model
>> it is.
> 
> If I understood right, Im using an updated version of the i2c-rtc.dtbo, which does include
> things for 2129. I think. Take a look:
> https://github.com/raspberrypi/firmware/issues/1190 <https://github.com/raspberrypi/firmware/issues/1190> 
> 
> So Im using the latest dtbo file which might know the 2129. 
> 
> Stefan
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