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--- network:gps [2026/03/14 21:49] – [Verification] gm5alx
+++ network:gps [2026/03/14 21:52] (current) – [Step D: Configure PTP (linuxptp)] gm5alx
@@ Line 6: / Line 6: @@
   * **Avoid:** Pi 3 or Zero. These use USB-to-Ethernet bridges or lack hardware timestamping support, which forces you to use “Software PTP,” significantly degrading accuracy.
+[[https://gemini.google.com/share/9fe616a57ef0|Gemini link]]
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 ===== 2. Hardware Connections =====
@@ Line 68: / Line 67: @@
 PTP on Linux uses ''%%ptp4l%%'' to manage the hardware clock and ''%%phc2sys%%'' to sync the System Clock (disciplined by your GPS) to the Ethernet controller’s PTP Hardware Clock (PHC).
-<HTML><ol style="list-style-type: decimal;"></HTML>
-<HTML><li></HTML><HTML><p></HTML>**Sync System Clock to PHC:**<HTML></p></HTML>
+**Sync System Clock to PHC:**
-<HTML><p></HTML>''%%sudo phc2sys -s CLOCK_REALTIME -c eth0 -w &%%''<HTML></p></HTML><HTML></li></HTML>
-<HTML><li></HTML><HTML><p></HTML>**Run PTP4L:**<HTML></p></HTML>
+  * ''%%sudo phc2sys -s CLOCK_REALTIME -c eth0 -w &%%''
-<HTML><p></HTML>''%%sudo ptp4l -i eth0 -m -S%%'' (The ''%%-S%%'' is for software-assisted hardware timestamping).<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>
+**Run PTP4L:**
+  * ''%%sudo ptp4l -i eth0 -m -S%%'' (The ''%%-S%%'' is for software-assisted hardware timestamping).
 To turn your Raspberry Pi 4 into a **PTP Grandmaster**, you need a configuration that tells ''%%ptp4l%%'' two things: “I am the boss” and “Never listen to anyone else’s clock.”