linux-kernel - Re: Ethernet issues with lite5200 board from linux-2.6.31

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Date:	Thu, 3 Dec 2009 09:44:04 +0530
From:	Yogesh Chaudhari <mr.yogesh@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Carsten Emde <ce@...g.ch>,
	Clark Williams <williams@...hat.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Robin Gareus <robin@...eus.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Philippe Reynes <philippe.reynes@...smpp.fr>,
	Fernando Lopez-Lezcano <nando@...ma.stanford.edu>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	Darren Hart <dvhltc@...ibm.com>, Jan Blunck <jblunck@...e.de>,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>,
	Jon Masters <jcm@...hat.com>,
	Mark Knecht <markknecht@...il.com>,
	John Kacur <jkacur@...hat.com>,
	linuxppc-dev <linuxppc-dev@...abs.org>
Subject: Re: Ethernet issues with lite5200 board from linux-2.6.31

2009/11/30 Grant Likely <grant.likely@...retlab.ca>:
> On Mon, Nov 30, 2009 at 2:50 AM, Yogesh Chaudhari <mr.yogesh@...il.com> wrote:
>> Hello,
>>         I am running linux kernel with rt patch on embedded board
>> based on lite5200 eval board. From linux-2.6.31 release, in which the
>> mdio patch has gone inside,  the fec ethernet does not come up on this
>> board. I get the following message at startup:
>> mpc52xx MII bus: probed
>> mdio_bus f0003000: error probing PHY at address 1
>>
>>
>> After the bootup if I try to do a ifconfig I get the message:
>> net eth2: of_phy_connect failed
>>
>>
>> If I change the value of reg in dts file (lite5200.dts) to 0 then this
>> ethernet comes up. However upto this kernel version, this was not
>> required.
>>
>> Ethernet does not come up on board with original lite5200.dts file
>
> Is your board based on the Lite5200 or the Lite5200B?  The phys are at
> different addresses on those two revisions of the board.  There is a
> different .dts file for each board.
>
>> phy0: ethernet-phy@1 {
>>                                 reg = <1>;
>>                         };
>>
>> Ethernet comes up on board with this change
>> phy0: ethernet-phy@1 {
>>                                 reg = <0>;
>>                         };
>
> Some PHYs treat address 0 as the 'broadcast' address.  You need to
> fill in this field (and modify the ethernet-phy@<address> node name)
> to reflect the address that your phy is actually at.
>
> g.
>
 I have tried the same with the latest kernel both with and without
rt, but with the same end result. I have checked that the mpc52xx fec
driver was changed from 2.6.31 version but I am not able to point
where this error is coming up from and how changing the reg value in
dts (which is not required till previous versions) is solving this.
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