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How install RTC schield by Hardkernell in Odroid c2 with OMV Erasmus 3.0.92?

43 posts in this topic

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6 minutes ago, marcellom said:

Good morning Zador :)

this is the output

/dev/rtc  /dev/rtc0



maybe is needed do this as follow?

To change the default RTC as e.g. used by hwclock create a file called /etc/udev/rules.d/99-rtc1.rules with e.g. the following contents:

KERNEL=="rtc1", SUBSYSTEM=="rtc", DRIVER=="", ATTR{name}=="m41t00", SYMLINK="rtc", MODE="0666"

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4 minutes ago, zador.blood.stained said:

.. and output of "udevadm info /dev/rtc0 --attribute-walk" ?


Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/i2c-1/1-0051/rtc/rtc0':

  looking at parent device '/devices/i2c-1/1-0051':

  looking at parent device '/devices/i2c-1':

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13 minutes ago, zador.blood.stained said:

Looks like RTC is configured correctly but nothing reads the time from it.

The kernel should do it automatically if it's configured correctly, please also check the output of "grep RTC_HCTOSYS /boot/config-$(uname -r)"


Edit: and "dmesg | grep -i rtc"


et voilà

root@openmediavault:~# grep RTC_HCTOSYS /boot/config-$(uname -r)

root@openmediavault:~# dmesg | grep -i rtc
[    3.073994] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[   12.946414] rtc-pcf8563 1-0051: chip found, driver version 0.4.3
[   12.947104] rtc-pcf8563 1-0051: rtc core: registered rtc-pcf8563 as rtc0

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I can trust my eyes..

I have disconnected router from internet...

After that i have shutdown my odroid.

At reboot (without internet ndp server cant' update the time, right?) time and date is correct...


Do you think we can close the case with a "solved"?

If is ok, ill write all in a post with entire procedure.

and change the 3d objet with [solved].

Tell me that I'm not deluding.....

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31 minutes ago, marcellom said:

At reboot (without internet ndp server cant' update the time, right?) time and date is correct...


As it's on almostall systems with a working network connection since on Armbian NTP is active by default. Please update the first post with this important piece of information for others trying to solve the same problem that is only one for stand-alone systems without any network connection these days :) 

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Yes dear Tkaiser.

What i want to do is start with a fresh and updated img and repeat the entire "procedure".

After that, ill write a clean post with all steps, to post here and in OMV forum.

Now i add Solved in the object EDIT BY ME: Is better wait after update try in the (now) updated OMV...

Could I thanks everyone to help?

Without you do not know how I would have done it!





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Strange: sometime on reboot time and date is right, sometime is reset to 1970.

RTC is brand new... but im thinking the battery is dead.

Ok people... i need to understand.

Ill write after battery. change.......



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