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Date:   Thu, 16 May 2019 14:58:00 +0200
From:   Andrew Lunn <>
To:     Vladimir Oltean <>
Cc:     Russell King - ARM Linux admin <>,
        Florian Fainelli <>,
        Maxime Chevallier <>,
        Vivien Didelot <>,
        netdev <>,
        "" <>,
        Antoine Tenart <>,
        Heiner Kallweit <>
Subject: Re: dsa: using multi-gbps speeds on CPU port

> My basic idea is to interface a Raspberry Pi-like board to a dumb
> "switch evaluation board" which has only the Ethernet ports and the
> SPI/whatever control interface exposed. The DSA CPU/master port combo
> in this case would go through a Cat5 cable, which is not going to pan
> out very well currently because both the RPi-side PHY and the switch
> board-side PHY need some massaging from their respective drivers. Both
> PHYs are C22.

Hi Vladimir

There are a number of boards like this, back to back PHYs. But they
all have the switch PHY strapped so they start on power on and
auto-negotiate. DSA then just works.


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