linux-kernel - Re: Second ethernet on kirkwood does not work when probed through DT

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Message-ID: <51D88A8E.1060104@gmail.com>
Date:	Sat, 06 Jul 2013 23:22:22 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Jonas Gorski <jogo@...nwrt.org>
CC:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: Second ethernet on kirkwood does not work when probed through
 DT

On 07/06/2013 09:54 PM, Jonas Gorski wrote:
> Hello Sebastian,
>
> using your DT patches[1] (on top of 3.10) I can't get the second
> ethernet to work on my kirkwood board.

Hi Jonas,

next time please name your board, because there are plenty of it.
Kirkwood is just the SoC used on them.

> in my dts file I use:
>
> &mdio { status = "okay"; };
>
> &eth0 { status = "okay"; ethernet0-port@0 { speed =<1000>; duplex
> =<1>; }; };
>

I guess you are using Iomega IX2 200?

> &eth1 { status = "okay"; ethernet1-port@1 { speed =<1000>; duplex
> =<1>; }; };
>
> (Both macs are connected to a switch, so use a fixed link, and no
> phy).
>
> Eth1 gets probed fine, but never gets a link when brought up, and
> trying to bring it down again hangs the board hard.
>
> Using Florian's older patches, it is brought up fine and works (after
> adapting the node names of course).
>
> Also I noticed that you named eth1's ethernet1-port node wrongly in
> (at least) your kirkwood conversion patch[2]; you used
>
> &eth1 { status = "okay"; ethernet1-port@0 { must be @1--^ phy-handle
> =<&ethphy1>; }; };

Can you please try to leave ethernet1-port@0 and match
the one in kirkwood.dtsi?

Both "ports" need reg = <0> as there is two controllers
with one port at 0 on Kirkwood.

If that works, please address a mail to ARM mailing list
where you describe the issue and propose the patch.

Sebastian

> which results in a null pointer access on boot:
>
> ... [   12.627136] mv643xx_eth_port mv643xx_eth_port.0 eth0: port 0
> with MAC address ... [   12.635955] Unable to handle kernel NULL
> pointer dereference at virtual address 00000000 [   12.644100] pgd =
> c0004000 [   12.646821] [00000000] *pgd=00000000 [   12.650418]
> Internal error: Oops: 5 [#1] ARM [   12.654702] Modules linked in: [
> 12.657778] CPU: 0 PID: 1 Comm: swapper Not tainted 3.10.0 #10 [
> 12.663634] task: c7827d60 ti: c782e000 task.ti: c782e000 [
> 12.669073] PC is at mv643xx_eth_probe+0x98/0x708 ...
>
>
> Regards Jonas
>
> P.S: I'm not on any ML you posted these patches to, so I could not
> reply directly.
>
> [1] https://patchwork.kernel.org/patch/2632571/ etc [2]
> https://patchwork.kernel.org/patch/2811861/

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