On Mon, Sep 7, 2020 at 4:41 AM Ulrich Windl
<ulrich.wi...@rz.uni-regensburg.de> wrote:
> I can't remember, but very recently I read that you can add an RTC to
> raspberries via GPIO. Ah, I think I read it in the SLES15 SP2 deployment
> guide.

It's typically done via I2C; there are quite inexpensive DS-1307
modules that plug onto the 40-pn header for example.
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