On Tue, 2009-11-03 at 17:52 -0600, Peter Tyser wrote: > In SGMII mode the link between a processor's internal TBI PHY and an > external PHY should always be 1000Mbps, full duplex. Also, the SGMII > interface between an internal TBI PHY and external PHY does not > support in-band auto-negotation. > > Previously, when configured for SGMII mode a TBI PHY would attempt to > restart auto-negotation during initializtion. This auto-negotation > between a TBI PHY and external PHY would fail and result in unusable > ethernet operation. > > Forcing the TBI PHY and and external PHY to link at 1000Mbps full duplex > in SGMII mode resolves this issue of auto-negotation failing. > > Note that 10Mbps and 100Mbps operation is still possible on the external > side of the external PHY even when SGMII is operating at 1000Mbps. > The SGMII interface still operates at 1000Mbps, but each byte of data > is repeated 100 or 10 times for 10/100Mbps and the external PHY handles > converting this data stream into proper 10/100Mbps signalling. > > Signed-off-by: Peter Tyser <pty...@xes-inc.com> > --- > In-band SGMII auto-negotiation doesn't work according to a lengthy > discussion with a Freescale FAE and the AN3869 SGMII appnote. XES's > MPC8572 and MPC8640 boards need this patch in order to use ethernet. These > boards generally use SGMII to connect to an BCM5482S PHY which has > an external gigabit-capable copper or fiber interface. > > Some of Freescale's reference platforms have an SGMII riser card - any > idea how those function when using auto-negotiation? Do they function? > Are the really using SGMII, or are they using 1000 Base-X? > > Some of the info in the manuals is misleading/confusing so any comments > are more than welcome from Freescalers:)
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