On Thu, Feb 28, 2019 at 12:19:40AM +0100, Andrew Lunn wrote: > > >From what you've described, it sounds like what you actually have is: > > > > MAC <---> Serdes PHY <---> PHY > > > > The Serdes PHY receives the SGMII in-band negotiation from the external > > PHY, but there is no propagation of the status from the serdes PHY to > > the MAC. > > Yes, that is a good description. So far, we have not yet got the MAC > to read the speed and duplex from the SERDES to configure itself. In > theory it should be able to, it is all in the same device. > > It might be that once the SERDES interrupts saying it has link we need > to program the MAC with the result of the in-band signalling. in-band > then seems a bit pointless. Or we are missing some configuration > somewhere to tell the MAC to use the in-band signalling result from > the SERDES.
in-band doesn't become pointless if we can't read from the PHY at the other end of the in-band link (for example, a Microtik copper SFP module with an AR8033 on, which has no connectivity to the host other than the serdes lane.) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up
