Could not enable RTC interrupt : Invalid argument in chorynd with DS3231

root@rock64:/var/log# tail -n 10 syslog 
Dec 26 15:56:25 localhost systemd[1]: chrony.service: Succeeded.
Dec 26 15:56:25 localhost systemd[1]: Stopped chrony, an NTP client/server.
Dec 26 15:56:26 localhost systemd[1]: Starting chrony, an NTP client/server...
Dec 26 15:56:26 localhost chronyd-starter.sh[3200]: WARNING: libcap needs an update (cap=40 should have a name).
Dec 26 15:56:26 localhost chronyd[3203]: chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 -DEBUG)
Dec 26 15:56:26 localhost chronyd[3203]: Could not enable RTC interrupt : Invalid argument
Dec 26 15:56:26 localhost chronyd[3203]: Frequency 16.061 +/- 3.900 ppm read from /var/lib/chrony/chrony.drift
Dec 26 15:56:26 localhost systemd[1]: Started chrony, an NTP client/server.
Dec 26 16:00:01 localhost CRON[3282]: (root) CMD (/usr/lib/armbian/armbian-truncate-logs)
Dec 26 16:05:01 localhost CRON[3317]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)

https://www.mail-archive.com/chrony-users@chrony.tuxfamily.org/msg02239.html
 

"

I'd suggest to call hwclock -w on shutdown or periodically
as a cron job.

"

root@rock64:~# cat /etc/cron.d/timesync2rtc1
# automatic timeset on /dev/rtc1 from system time in every 11 minutes on everyday ...
#PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
*/11 * * * * root /usr/bin/bash -c 'for i in 'ntp.ubuntu.com' '0.ubuntu.pool.ntp.org' '1.ubuntu.pool.ntp.org' '2.ubuntu.pool.ntp.org'; do /usr/bin/nc -v -z -u "$i" 123 && /usr/sbin/hwclock -w -f /dev/rtc1 && break; done'

root@rock64:~# egrep -iv "^#|^$" /etc/chrony/chrony.conf
pool ntp.ubuntu.com        iburst maxsources 4
pool 0.ubuntu.pool.ntp.org iburst maxsources 1
pool 1.ubuntu.pool.ntp.org iburst maxsources 1
pool 2.ubuntu.pool.ntp.org iburst maxsources 2
keyfile /etc/chrony/chrony.keys
driftfile /var/lib/chrony/chrony.drift
logdir /var/log/chrony
maxupdateskew 100.0
makestep 1 3
server 192.178.0.213 iburst prefer
local stratum 8 orphan
allow 192.178.0.0/24

root@rock64:~# chronyc sources -v
210 Number of sources = 9

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||      Reachability register (octal) -.           |  xxxx = adjusted offset,
||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
||                                \     |          |  zzzz = estimated error.
||                                 |    |           \
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
===============================================================================
^* rock64                        3   8   377   49m   -109us[  +23us] +/-   59ms
^- pugot.canonical.com           2   8   277   207  +2451us[+2451us] +/-   53ms
^- chilipepper.canonical.com     2   9   177   475   +199us[ +199us] +/-   57ms
^- alphyn.canonical.com          2   9   377   472   +513us[ +513us] +/-  116ms
^- golem.canonical.com           2   9   277   473  -3688us[-3688us] +/-   62ms
^- time.cloudflare.com           3   9   377   470   +537us[ +537us] +/-   25ms
^- prae.hu                       3   9   377   470  -8304us[-8304us] +/-   57ms
^- time.cloudflare.com           3   9   377   412  -1216us[-1216us] +/-   24ms
^- login-vlan194.budapest2.>     2   9   377   466  +1594us[+1594us] +/-   44ms

root@rock64:~# timedatectl 
               Local time: Wed 2020-12-30 10:42:42 CET 
           Universal time: Wed 2020-12-30 09:42:42 UTC 
                 RTC time: Wed 2020-12-30 09:42:48     
                Time zone: Europe/Budapest (CET, +0100)
System clock synchronized: yes                         
              NTP service: active                      
          RTC in local TZ: no 

( kikadff v | 2020. 12. 26., szo – 19:00 )

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