From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Lunn <andrew@lunn.ch>
Subject: Re: [ISSUE: mv88e6xxx]: Down/Up link and not forwarding
Date: Tue, 4 Oct 2016 22:28:22 +0200
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Cc: Jose Antonio Delgado Alfonso <jose.delgado@aoifes.com>,
        netdev@vger.kernel.org,
        Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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> >The main difference is GLOBAL2 5th register. When the unit is just
> >initialized, the driver sets this register to 00ff, however, when
> >the issue happens, its value is c12f.

You might want to hack the MDIO driver and get it to trap writes to
this register and give you a call stack.

     Andrew