Subject: Re: ifmedia on fxp: can ifmedia defeat NWAY and force 10baseT?
To: None <M.Drochner@fz-juelich.de>
From: Jason Thorpe <email@example.com>
Date: 10/26/1999 11:25:46
On Tue, 26 Oct 1999 15:15:24 +0200
Matthias Drochner <firstname.lastname@example.org> wrote:
> What happens if I force my card to eg 100 half duplex? Then the
> switch can't detect a link failure and has no reason to restart
> nway. I'd say our driver has to initiate an autonegotiation session,
> advertising only the bit(s) wanted by the user, if the media setting
> is changed.
PHYs are supposed to do this when you program the ANAR register (this == send
an NWay code word). Often, when you set the "autonegotiate enable" bit in
a PHY, it will perform NWay itself (and possibly self-program).
When you set e.g. 10baseT, the ANAR is programmed with "adv. 10baseT" only.
-- Jason R. Thorpe <email@example.com>