[U-Boot-Users] Gigabit Ethernet?

[Travis Sawyer]

On Thu, 2004-03-11 at 11:02, Wolfgang Denk wrote:
> In message <1079020123.17587.135.camel at pavement.sandburst.com> you wrote:
> > 
> > Is anyone working on Gigabit Ethernet PHY support for u-boot?
> 
> What _exactly_ are you looking for?
> 
The IBM 440GX supports GbE on the 2nd and 3rd ports, if a gigabit
capable phy is in place that is.

The current miiphy_utils (specifically miiphy_speed and miiphy_duplex)
read the phy autonegiotation link partner ability register (reg 0x05) to
determine current link speed and duplex.

Register 5 is a standard IEEE802.3 register.  However, in order to get
'true' status (10/100/1000), extended registers are needed.

In the case of the ocotea board, IBM placed a LXT9762 (6 port phy) for
emac 0 and 1 (as they only support 10/100), and two (2) cicada CIS8201
phys for emac 2 and 3 (supports 10/100/1000).

The problem I see is that the extended register set may not be the same
across the phy part spectrum.  So, one would need to check the OUI and
then go to the appropriate register for that part.  Which, IMHO, would
add quite a bit of code.

Perhaps for my application I should force 1000 Gbps off in the
autonegotiation register...

-travis