From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Tyser Date: Thu, 18 Nov 2010 09:34:11 -0600 Subject: [U-Boot] [PATCH] revert "tsec: Force TBI PHY to 1000Mbps fullduplex in SGMII mode" In-Reply-To: <3F607A5180246847A760FD34122A1E05019AD0@039-SN1MPN1-002.039d.mgd.msft.net> References: <1289986984-2314-1-git-send-email-b26998@freescale.com> <20101117131429.9F55E14E646@gemini.denx.de> <1290008972.20072.73.camel@petert> <3F607A5180246847A760FD34122A1E0501827C@039-SN1MPN1-002.039d.mgd.msft.net> <1290056492.695.20.camel@ptyser-laptop> <3F607A5180246847A760FD34122A1E05019AD0@039-SN1MPN1-002.039d.mgd.msft.net> Message-ID: <1290094451.20072.92.camel@petert> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de > >My understanding is that the SGMII link is always at 1000Mbps speed - see > >figure 1 from the app note. Additionally look at figure 3. My understand > >from it, and the app note's text is that SGMII auto-negotiation doesn't > >really occur - its just passing the PHY-side auto-negotiation results to > >the Freescale MAC, which software then configures. I'm not sure what the > >purpose of the "SGMII auto-negotiation" is - its not really auto- > >negotiating and the same information can be read from the PHY via its MDIO > >interface, which is what is happening on X-ES boards currently. > > I guess the point is to save MDIO signals to the external PHY and read the > negotiated result from the internal TBI PHY. Do the P2020DS, MPC8572DS and P1/P2 RDB boards not have an MDIO interface to their PHYs'? I've never heard of a board that doesn't, and would guess the tsec driver in U-Boot requires a PHY to be accessible via MDIO to use the corresponding network interface. I can forward you the email thread about SGMII auto-negotiation with Freescale's FAE off-list if you'd like as well. Best, Peter