[systemd-devel] Cannot find a way to get time read from RTC during boot

[Mike Gilbert]

On Thu, Mar 12, 2020 at 7:13 AM Kevin P. Fleming <kevin at km6g.us> wrote:
> Prior to systemd, with the 'hwclock' package installed, a udev rule
> would trigger reading of the RTC and setting the system clock when
> /dev/rtc0 appeared. With systemd running, the script run by that udev
> rule is suppressed, it doesn't do anything.
>
> With a system using solely systemd-provided services, what's the
> proper mechanism to get the time read from an RTC whose driver is
> loaded by systemd-modules-load.service?

Your use case is likely not covered by "systemd-provided" services.

I think your best bet would be to "un-supress" that hwclock udev rule.