netdev - Re: sun7i-dwmac: link detection failure with 1000Mbit parters

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Date:   Fri, 1 Nov 2019 10:57:45 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Priit Laes <plaes@...es.org>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
        "wens@...e.org" <wens@...e.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>
Subject: Re: sun7i-dwmac: link detection failure with 1000Mbit parters

On Fri, Nov 01, 2019 at 09:49:20AM +0000, Priit Laes wrote:
> On Thu, Oct 31, 2019 at 10:38:41AM +0000, Russell King - ARM Linux admin wrote:
> >   mii-diag -v eth0
> > 
> > would be useful to see for the case where the link has failed, without
> > replugging the ethernet cable.
> 
> mii-diag seems to be quite an useful tool, but unfortunately has not been
> packaged anymore on newer distro releases like Debian stable and latest
> Ubuntu LTS.

which is unfortunate because it's the best tool for debugging PHY
related problems.  mii-tool doesn't dump registers, and dumping the
PHY registers is extremely useful.

-- 
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