Ethernet green led in JAX not blinking

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,
I am using a custom carrier board based on Xavier AGX SOM. I am facing an issue with the Ethernet port LED as below.

Initially, we used the L4T32.6.1 and everything was good. if we connect the Ethernet cable to the Ethernet port, both the LEDs are blinking(yellow-on state, Green-blinking state).

Now I have migrated to L4T35.3.1 and I am facing an issue with one of the ethernet port LEDs. when I connect the cable to the ethernet port, the yellow LED is in the ON state and Green LED is in the OFF state. I can use the internet as usual, but the Green LED is not blinking.

I am expecting the GREEN LED should be blinking while using the internet (as same behaviour in L4T 32.6.1).

Could you please help me to solve this issue?

ethtool output:

Settings for eth0:
       Supported ports: [ TP MII FIBRE ]
       Supported link modes:   10baseT/Half 10baseT/Full 
                               100baseT/Half 100baseT/Full 
                               1000baseT/Half 1000baseT/Full 
       Supported pause frame use: Symmetric Receive-only
       Supports auto-negotiation: Yes
       Supported FEC modes: Not reported
       Advertised link modes:  10baseT/Half 10baseT/Full 
                               100baseT/Half 100baseT/Full 
                               1000baseT/Half 1000baseT/Full 
       Advertised pause frame use: No
       Advertised auto-negotiation: Yes
       Advertised FEC modes: Not reported
       Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                            100baseT/Half 100baseT/Full 
                                            1000baseT/Full 
       Link partner advertised pause frame use: No
       Link partner advertised auto-negotiation: Yes
       Link partner advertised FEC modes: Not reported
       Speed: 1000Mb/s
       Duplex: Full
       Port: Twisted Pair
       PHYAD: 0
       Transceiver: internal
       Auto-negotiation: on
       MDI-X: Unknown
       Supports Wake-on: g
       Wake-on: d
       Link detected: yes

ifconfig output:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.9.159  netmask 255.255.254.0  broadcast 192.168.9.255
        inet6 fe80::fd3f:24f1:961:392b  prefixlen 64  scopeid 0x20<link>
        ether 48:b0:2d:63:c6:4d  txqueuelen 1000  (Ethernet)
        RX packets 11783  bytes 10589264 (10.5 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 934  bytes 80375 (80.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Why is green led not working?

Thanks in advance,
Ashik P.

2

Is this behavior also happened on devkit? Did you change the PHY on your custom board?

3

Hi @WayneWWW

Is this behavior also happened on devkit?

There are no leds in Xavier AGX devkit’s ethernet port. So couldnt test.

Did you change the PHY on your custom board?

No, we are using the same phy

Thanks
Ashik

4

Basically this thing is defined in each vendor PHY. There is no standard answer for such questions since long time ago.

If you asked this for jetson nano, tx2, orin, then the answers are all same.

You need to get the datasheet from the vendor and configure it from their PHY driver.

5

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