Thanks @jaski.tx and @max.tx ! I’ve made some progress thanks to your answers.
But I’m curious about the current behavior.
Once the system has completely booted up. The NTP time kicks in and synchronizes with the system clock. This I confirm with the “date” command.
I then check the hardware clock time with “hwclock -r” and it is old.
So I write using “hwclock -w”. I’m assuming this writes the system clock time to the hardware clock.
I readback the time with “hwclock -r” and it shows the correct time.
But on the next power cycle I still get this:
Now I don’t have an RTC on my custom board so I don’t expect the value to get retained.
But I’m curious about this particular timestamp [Fri Oct 11 17:53:56 UTC 2019] that is always retained on every power cycle. This was assigned when my VF50 module was last connected to the Toradex Colibri Eval board.
How does this parameter get updated when my module is connected to the Eval board? If it continues to display when I place the module on my custom board, I guess it means this value is present in the module firmware so I should be able to write to it too?