Re: Fwd: Micrel KSZ9031RN PHY problem

From: Sascha Hauer <s.hauer@pengutronix.de>
To: Guillermo Rodriguez Garcia <guille.rodriguez@gmail.com>
Cc: barebox@lists.infradead.org, Philipp Zabel <pza@pengutronix.de>
Subject: Re: Fwd: Micrel KSZ9031RN PHY problem
Date: Thu, 21 Apr 2016 09:32:06 +0200	[thread overview]
Message-ID: <20160421073206.GC21638@pengutronix.de> (raw)
In-Reply-To: <CABDcavYf=ts161dQRB=diaEqNcyZjLq=ogYAja0y3BLp_QU+0w@mail.gmail.com>

On Wed, Apr 20, 2016 at 05:58:40PM +0200, Guillermo Rodriguez Garcia wrote:
> Hello,
> 
> 2016-04-19 9:11 GMT+02:00 Sascha Hauer <s.hauer@pengutronix.de>:
> > Hi Guillermo,
> >
> > +Cc Philipp Zabel who ported the patch to barebox
> >
> > On Mon, Apr 18, 2016 at 04:49:47PM +0200, Guillermo Rodriguez Garcia wrote:
> >> Hello all,
> >>
> >> I am playing with barebox on an Atmel SAMA5D3 Xplained board. It is
> >> now working fine for the most part, however after updating to the
> >> latest sources from git I found a problem that I had not seen before.
> >>
> >> This board has two Ethernet interfaces; eth0 uses a Micrel KSZ9031RN
> >> PHY, and eth1 uses a Micrel KSZ8081RNB PHY.
> >>
> >> It seems that after release 2016.03.0, eth0 does not work anymore with
> >> some routers. Specifically I found this problem with a Comtrend
> >> VG-8050. I have tested other routers and the problem was not present
> >> there.
> >>
> >> After some research it seems that the problem is caused by this
> >> commit: http://git.pengutronix.de/?p=barebox.git;a=commit;h=da89ee8f2e04e116410632a185024f58b8262d87
> >>
> >> Before this commit eth0 was working fine. After this commit, the link
> >> cannot established anymore:
> >>
> >> [...]
> >> barebox:/# ping 192.168.0.128
> >> ping failed: Network is down
> >>
> >> Before diving further into this I thought it could be a good idea to
> >> ask, in case someone can shed some light here.
> >
> > I have no idea what the issue is here. We might have to make this option
> > configurable via devicetree to give boards different options. Since the
> > patch comes from the Linux Kernel, do you have the same problems under
> > Linux?
> 
> I'm trying to get the latest kernel to boot. The latest version
> supported by Atmel is 4.1, which doesn't have the patch yet. Will
> report back asap.

Thanks. We can revert this patch since Philipp only ported it to stay in
sync with the kernel. Anyway, if it makes problems we'll probably need a
solution for the kernel aswell.

Sascha

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