rpi3 clock drift

[Trev]

Ian Lepore wrote on 27/11/2019 09:48:
> On Tue, 2019-11-26 at 22:34 +0000, James Shuriff wrote:
>> kern.timecounter.tc.ARM MPCore Timecounter.frequency: 54000000
> 
> 54 MHz seems like a very strange frequency for a clock in an arm
> system.  Of course, everything about an RPi seems to be strange and
> non-standard.
> 
> Can someone else with an rpi3 (which keeps good time) confirm that
> that's the usual number?

trev at rpi3 [/home/trev] $ sysctl kern.timecounter 
 
 

kern.timecounter.fast_gettime: 1 
 
 

kern.timecounter.tick: 1 
 
 

kern.timecounter.choice: ARM MPCore Timecounter(1000) dummy(-1000000) 
 
 

kern.timecounter.hardware: ARM MPCore Timecounter
kern.timecounter.stepwarnings: 0 
 
 

kern.timecounter.tc.ARM MPCore Timecounter.quality: 1000 
 
 

kern.timecounter.tc.ARM MPCore Timecounter.frequency: 19200000 
 
 

kern.timecounter.tc.ARM MPCore Timecounter.counter: 1615733797 
 
 

kern.timecounter.tc.ARM MPCore Timecounter.mask: 4294967295

trev at rpi3 [/home/trev] $ uname -a 
 
 

FreeBSD rpi3.sentry.org 13.0-CURRENT FreeBSD 13.0-CURRENT r344513 RPI3B 
arm64