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Basically, just follow these steps:
1. Add PTP clock in DTS file.
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2. We need one PTP grandmaster within
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LAN.
PTP grandmaster sync time from GPS generally as can be seen in Figure 5.
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| Code Block | ||
|---|---|---|
| ||
ptp4l[34476.707]: port 1 (enp2s0): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[34476.707]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[34476.707]: port 0 (/var/run/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[34483.780]: port 1 (enp2s0): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES ptp4l[34483.781]: selected local clock 94c691.fffe.fc9abf as best master ptp4l[34483.781]: port 1 (enp2s0): assuming the grand master role |
3. Run PTP slave.
To run ptp4l on SP7350, we need cross compile linuxptp, and install it on SP7350 Linux Roofs.
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Pay attention to two places.
a. Check ethernet interface at promise mode?
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If not, you can switch over manually with this command.
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Thus, SP7350 can receive all the broadcast packets.
b. Check GMAC driver.
Check 0465ns accuracy within config_addend function to fix incorrect PTP TAR register value.
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4. Check synchronization result.
Use tool phc_ctl to check PHC time.
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