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I have two custom ARM i.MX6 I210 systems, A and B.
System A works fine, establishes link and passes the loopback/offline test.
System B brings up the ethernet interface but never establishes link (100 or 1Gbit), and the loopback/offline test fails:
ethtool --test eth1
The test result is FAIL
The test extra info:
Register test (offline) 0
Eeprom test (offline) 0
Interrupt test (offline) 0
Loopback test (offline) 13
Link test (on/offline) 1
System A has an I210 (WGI210AT) connected over PCIe to the i.MX6. It uses the built-in phy and runs Kernel 3.0.35 and IGB driver 5.0.6. It has INVM image 'Copper NoAPM v0.6'.
System B has an I210 (WGI210AT) connected over PCIe to the i.MX6. It uses the built-in phy and runs Kernel 3.14.79 and IGB driver 5.0.5-k. It has INVM image 'Copper NoAPM v0.6'
This failure occurs with or without magnetics connected.
Could anyone suggest what might cause this type of failure? I believe that PCI communications with the I210 is ok given that the driver can communicate with the part. I have tested multiple instances of system B and all fail in the same way, so I don't believe the I210 is faulty.