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this post was submitted on 24 Jan 2024
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Have you ever worked with a computer with modern general-purpose OS like Linux and no RTC? It sucks. It is not strictly necessary, you can live without it, but you need workarounds for basic stuff timestamps in log files or in the file system. At least for a minute until NTP connection is established, but may be longer when internet connection is not available. And when routers are rebooted most often? When troubleshooting broken internet connection. This is also the time when properly timestamped logs could be useful.
And battery backed RTC is cheap. It doesn't fit on a Raspberry Pi board, but can easily fit into a router case. No excuse for omitting it.
I've used Raspberry Pis since the first model came out and other SBCs and the lack of RTC has never really been an issue. The Pi syncs time by the time it makes it to the desktop. I can see it being useful for early boot timestamps but the most useful such log (dmesg) is just elapsed time since power on anyways. I can also see it being useful for devices doing data logging without Internet or regular power supply like a remote sensor logging device. I guess I just don't see it as a crucial component of a home router. I agree it's a cheap and useful addition though, just not maybe the most essential of one.