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I'm looking for a single-board computer with seemingly simple requirements:

  • Gigabit ethernet port
  • Ethernet port supports HW timestamping for PTP and NTP
  • Low power usage
  • Few GPIO pins
  • The ethernet interface is not USB

I've searched for a while, but it's very annoying to search because HW timestamping and if the ethernet is connected to USB or not is rarely listed.

Maybe someone here knows any good devices?

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  • Honestly, USB connected Ethernet is pretty rare. I would probably answer but I have no idea what you mean by HW time-stamping in the context of NTP.
    – jaskij
    Commented Feb 6, 2020 at 16:00
  • @jan-dorniak Honestly, USB connected Ethernet is pretty rare. The older Raspberry Pi's AFAIK all had ethernet connected to the USB bus?
    – Avamander
    Commented Feb 6, 2020 at 16:01
  • but I have no idea what you mean by HW time-stamping in the context of NTP. Software such as chrony can utilize that feature for more accurate time synchronization, but I want it primarily for PTP.
    – Avamander
    Commented Feb 6, 2020 at 16:02
  • And they are the exception. That they are popular doesn't really matter. That SoC was designed for settops... The SoC in Pi 4 still doesn't have an on-chip MAC, it uses a PCIe connected one.
    – jaskij
    Commented Feb 6, 2020 at 16:03
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    do you mean something like a hardware RTC? In that case I could probably recommend something but it might end up in a 200 Euro range.
    – jaskij
    Commented Feb 6, 2020 at 16:04

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