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Date: Thu, 24 Sep 2009 22:39:18 +0200
From: Kristof Provost <kristof@sigsegv.be>
To: Pyun YongHyeon <pyunyh@gmail.com>
Message-ID: <20090924203918.GI19069@nereid>
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Cc: current@freebsd.org
Subject: Re: mge, mii/e1000phy
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On 2009-09-23 14:40:11 (-0700), Pyun YongHyeon <pyunyh@gmail.com> wrote:
> Oh, this question may not be related with your link issue. I wanted
> to know why mge(4) had to check media type in its ioctl handler.
> The advertised capability has nothing to do with link partner's
> capability. The advertised capability is used in auto-negotiation
> process and the PHY will choose the highest common denominator
> capability. So if we want to disable 1000baseT/half-duplex for
> whatever reason, it can be achieved by not advertising 1000baseT/
> half-duplex capability to mii layer.
> 
I think it's advertising the following:
10baseT
10baseT-FDX
100baseTX
100baseTX-FDX
1000baseT
1000baseT-FDX
auto

In any case, the values used during mii_phy_add_media are 
sc->mii_capabilities 0x7949 and sc->mii_extcapabilities 0x3000.

Regards,
Kristof