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Message-ID: <20161004202822.GC22841@lunn.ch>
Date:   Tue, 4 Oct 2016 22:28:22 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Jose Antonio Delgado Alfonso <jose.delgado@...fes.com>,
        netdev@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: Re: [ISSUE: mv88e6xxx]: Down/Up link and not forwarding

> >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

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