On Mon, Aug 28, 2017 at 10:38:37AM +0200, Marcin Wojtas wrote: > Hi Antoine, > > Can you be 100% sure that when using SGMII with PHY's (like Marvell > Alaska 88E1xxx series), is in-band link information always available? > I'd be very cautious with such assumption and use in-band management > only when set in the DT, like mvneta. I think phylib can properly can > do its work when MDIO connection is provided on the board.
There is another issue to be aware of: if you're wanting to use flow control autonegotiation, that is not carried across SGMII's in-band signalling. If you want to use SGMII's in-band signalling for the duplex and speed information, you still need phylib's notification to properly set the flow control. <plug> Switching mvpp2 to use phylink (which is needed for the 1G SFP slot on mcbin) will handle all this for you - dealing with both in-band and out-of-band negotiation methods, and combining them in the appropriate manner for the selected operation mode. </plug> -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up According to speedtest.net: 8.21Mbps down 510kbps up
