netdev - Re: HW question: i210 vs. BCM5461S over SGMII: no response from PHY to MDIO requests?

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Date:   Fri, 16 Mar 2018 22:02:40 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Frantisek Rysanek <Frantisek.Rysanek@...t.cz>
Cc:     netdev@...r.kernel.org
Subject: Re: HW question: i210 vs. BCM5461S over SGMII: no response from PHY
 to MDIO requests?

> The DeLock board is this beauty:
> http://www.delock.de/produkte/G_89481/merkmale.html?setLanguage=en
> DeLock techsupport were so kind as to provide me with a schematic 
> snippet, showing the wiring of the i210 fiber SKU's dedicated 
> I2C/MDIO pins to the SFP socket's standard I2C pins. There are 
> pull-up resistors on the board for SDA/SCL. Nothing outright custom 
> here - more likely close to some Intel reference design. The board 
> works just fine.

I would suggest you ignore MDIO and try looking on the I2C bus.

Does ethtool -m show anything useful?

     Andrew