On Fri, Jul 22, 2022 at 02:59:36PM +0200, Marek Behún wrote: > The 2.5GBASE-X PCS does not support Clause 37 Auto-Negotiation. > Hence, the 1000BASE-X PCS is expected to have its Clause 37 > Auto-Negotiation functionality disabled so that the /C/ ordered set > will not be transmitted. If a 2.5GBASE-X PCS receives /C/ ordered > set, then undefined behavior may occur. > ... The reason that's probably stated is because there hasn't been any standardisation of it, different implementations behave differently, so they can't define a standard behaviour without breaking what's already out there. With mvneta, the reality is that the 2.5G speed is implemented by changing the clock configuration in the COMPHY block (serdes) - which basically clocks everything 2.5x faster. I seem to remember mvpp2 is the same deal. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
