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Message-Id: <20180710.105230.2160849304208584873.kimoto@cybertrust.co.jp>
Date: Tue, 10 Jul 2018 10:52:30 +0900 (JST)
From: Masahiko KIMOTO <masahiko.kimoto@...ertrust.co.jp>
To: andrew@...n.ch
Cc: f.fainelli@...il.com, fugang.duan@....com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, hiraku.toyooka@...ertrust.co.jp
Subject: Re: [RFC PATCH 0/1] net: phy: skip autoneg of ethernet(fec) on
network boot
> > > I completely acknowledge and support the use case, but your
> > > implementation is definitively not the way to go. In my experience the
> > > problem is usually that there may be a disagreement on the
> > > Pause/Asym_Pause advertisement bits and that alone is responsible for
> > > triggering a re-negotiation. Can yo check if that is the case here?
> >
> > Thank you for your support.
> >
> > Concening the problem about PAUSE/Asym_PAUSE advertisement you pointed out,
> > I could not understand your consideration.
> >
> > Would you tell me more detail about it?
>
> Hi Masahiko
>
> You said that the PHY is being configured 3 times, and might be doing
> auto-neg three times. Often a phy will not actually perform auto-neg,
> or do it much faster, if the advertised bits do not change with each
> re-configuration.
>
> So check how u-boot is configuring what is advertised, and look at
> what Linux is configuring. In particularly, look at the pause
> configuration. If pause is configured different in u-boot and Linux,
> try to make it the same. Things might go faster than.
Thank you.
I'll try to check out u-boot side by mii command and Linux(server)
side by ethtool.
---------------------------------------------------------------------------
Masahiko KIMOTO,Ph.D. / Cybertrust Japan Co., Ltd.
mail: masahiko.kimoto@...ertrust.co.jp
web: https://www.cybertrust.co.jp/ https://www.miraclelinux.com/
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