netdev - Re: Marvell 88E609x switch?

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Date:	Fri, 27 Feb 2009 15:25:48 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Gary Thomas <gary@...assoc.com>,
	Kumar Gala <galak@...nel.crashing.org>,
	Andy Fleming <afleming@...escale.com>
Cc:	netdev@...r.kernel.org, Anton Vorontsov <avorontsov@...mvista.com>,
	Li Yang <leoli@...escale.com>
Subject: Re: Marvell 88E609x switch?

On Fri, Feb 27, 2009 at 06:22:40AM -0700, Gary Thomas wrote:

> >> However, the network subsystem still can't locate it.  It may be
> >> a complication of the OF stuff and how the [gianfar] network
> >> device knows what PHY to look at.
> >>
> >>   starting network interfaces...
> >>   24520:01 not found
> >>   eth0: Could not attach to PHY
> > 
> > It's correct that eth0 should not associate with a PHY -- since the
> > MAC connects to the switch chip over GMII/RGMII/SGMII, there is no
> > PHY involved.
> 
> Yes, but it's expecting to be able to talk to the PHYLIB layer
> and ask things like speed, duplex, link state, etc.
> 
> > Is the gianfar driver refusing to up the interface without a PHY?
> > It shouldn't do that -- IMHO it's perfectly fine to not have a PHY
> > on your ethernet MAC.
> 
> It seems so, yes.  I tried disabling the PHY connection in the OF
> tree and now eth0 doesn't even try to come up :-(

gianfar authors/maintainers: is there a way of using gianfar purely
as a (R)(G)MII transport, i.e. without it trying to talk to a PHY?
Gary is trying to use it to just pass packets to another
(R)(G)MII-speaking chip that doesn't have a PHY interface, but gianfar
seems to bail out if you don't give it a PHY to talk to.
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