netdev - Software loopback with phy 88E1116R and marvell MV78100 gbe

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Date:   Thu, 23 Feb 2017 09:42:25 +0100
From:   Paolo Minazzi <paolo.minazzi@...il.com>
To:     netdev@...r.kernel.org
Subject: Software loopback with phy 88E1116R and marvell MV78100 gbe

Hi to all,
I have written a low level driver for MV78100 arm board.
All works well.
I have built a physical loopback cable to cross rx and tx to test my
driver and all is good.

I have an other board (with imx6).
On this board I was able to put the PHY (micrel) in loopback mode, so
I do not need a physycal loop. All works well.

I tried to do the same things on 88E1116R, setting the but 14 of reg 0.
But If I do it I lose the link, and the test program does not work.
I tried to force the link in software, but seems the controller send
packets but it is not able to receive them.
Is possibile to do such a software loopback on 88E1116R ?

Thanks in advance,
Paolo Minazzi