From mboxrd@z Thu Jan  1 00:00:00 1970
From: Graeme Russ <graeme.russ@gmail.com>
Date: Thu, 22 Sep 2011 11:20:13 +1000
Subject: [U-Boot] Question: Information regarding MII and PHY
Message-ID: <CALButCJ1y5Getca_qyx=vwn8iRAbUK3SPMDUwHkxku9RNRrh_Q@mail.gmail.com>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Hi All,

I'm looking at adding a new Gigabit Ethernet driver (Realtek
RTL8211CL) to U-Boot. The datasheet, in addition to register
descriptions, mentions MII/GMII and PHY support (but not much on the
specifics). Now in U-Boot there appears to be a common set of code
relating to PHY and MII. There appears to be a mix of Ethernet drivers
that use MII/PHY and drivers that do not, but I cannot seems to quite
get me head around it all. One weird thing is that there does not
appear to be any granular inclusion of PHY drivers -
/include/config_phylib_all_drivers.h defines them all when
CONFIG_PHYLIB is defined, but I could not find any boards that defined
just one PHY driver. I also cannot find how MII/PHY functions interact
with PCI for PCI based cards.

In short, I'm very confused - Can anyone give me any pointers to how
it all fits together

Thanks,

Graeme