netdev - Re: request for help using mv88e6xxx switch driver

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Message-ID: <0629bce6-f5eb-4c07-bff0-76003b383568@lunn.ch>
Date: Wed, 7 May 2025 17:15:00 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Steve Broshar <steve@...merwirelessmedtech.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: request for help using mv88e6xxx switch driver

On Wed, May 07, 2025 at 02:57:32PM +0000, Steve Broshar wrote:
> Hi,
> 
> We are struggling to get ethernet working on our newly designed, custom device with a imx8mn processor and a mv88e6230 switch ... using the mv88e6xxx driver. We have worked on it for weeks, but networking is not functional. I don't know where to find community support or maybe this is the community. I'm used to more modern things like websites; not email lists.
> 
> So that you understand the context at least a little: we have MDIO comms working, but the network interface won't come up. I get encouraging messages like:
> 
> 	[    6.794063] mv88e6085 30be0000.ethernet-1:00: Link is Up - 1Gbps/Full - flow control off
> 	[    6.841921] mv88e6085 30be0000.ethernet-1:00 lan3 (uninitialized): PHY [mv88e6xxx-0:03] driver [Generic PHY] (irq=POLL)
> 
> But near the end of boot I get messages:
> 
> 	[   11.889607] net eth0: phy NOT found
> 	[   11.889617] fec 30be0000.ethernet eth0: A Unable to connect to phy
> 	[   11.892275] mv88e6085 30be0000.ethernet-1:00 lan4: failed to open master eth0

Do you have a direct MAC to MAC connection between the FEC and the
Switch? If so, you need fixed-link. Look at imx7d-zii-rpu2.dts for an
example.

	Andrew