linux-kernel - Re: tg3 'No PHY devices' loading issue

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Date:	Tue, 17 Apr 2012 17:07:00 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Matt Carlson <mcarlson@...adcom.com>,
	Michael Chan <mchan@...adcom.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: tg3 'No PHY devices' loading issue

On Tue, Apr 17, 2012 at 09:59:55PM +0100, Ben Hutchings wrote:
> On Tue, Apr 17, 2012 at 03:40:30PM -0400, Josh Boyer wrote:
> > On Tue, Apr 17, 2012 at 08:10:42PM +0100, Ben Hutchings wrote:
> > > On Tue, Apr 17, 2012 at 11:50:07AM -0700, Matt Carlson wrote:
> > > > On Tue, Apr 17, 2012 at 10:18:57AM -0400, Josh Boyer wrote:
> > > > > Hi Matt and Michael,
> > > > > 
> > > > > I'm seeing an odd issue with the tg3 driver on one of my development
> > > > > machines.  I've tried kernels 3.2.10, 3.3.0, 3.3.1, 3.3.2 and 3.4-rc3
> > > > > and they all seem to exhibit this issue now.  When the machine boots
> > > > > and the tg3 driver is loaded, it fails to find a PHY and then reports
> > > > > 'Problem fetching invariants of chip'.  If I do a rmmod/modprobe of
> > > > > tg3 after login, the probe seems to work fine and ethernet works as
> > > > > expected.  You can see this in the dmesg below:
> > > [...]
> > > > The 57788 uses the broadcom phylib module.  For some reason, it isn't
> > > > available the first module load attempt.  A while ago, code was added to
> > > > phylib to request modules from userspace if the particular phy support
> > > > code wasn't already loaded.  It looks like this mechanism isn't working
> > > > too well the first time through.
> > > [...]
> > > 
> > > At a guess, tg3 is in the initramfs but broadcom isn't.
> > 
> > Good guess.  At least on one of the initramfs' I checked.  I'll verify
> > the others, but it seems likely they match.  As I just said in my other
> > reply, I would have expected tg3 to have a module dep on it to get it
> > included in the initramfs built, but it seems that isn't the case.
>  
> tg3 doesn't use any symbols from broadcom, which is the only way
> depmod can find dependencies.
> 
> In initramfs-tools (used in Debian and its derivatives) we just copy
> all PHY drivers into the initramfs by default.  dracut should probably
> do the same, at least when phylib is in the initramfs (or built into
> the kernel).  (tg3 does use symbols from phylib.)

Heh.  Yep, that's basically what I just concluded as well in my other
reply.  I'll work with Harald and get that included or something similar
to it.

josh
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