Hi Peter,
On 6/26/2010 4:19 PM, Peter Tyser wrote:
Hi Felix,
In any case, our testing and the Freescale FAE's input showed that in-band auto-negotiation on the SGMII interface didn't work, thus I submitted the change you referenced. If my memory is correct, empirically it looked like the MPC8572 did support 1000 base-X auto-negotiation, but not SGMII auto-negotiation. Can you validate you're using SGMII and not 1000 base-X to connect the P2020 to the VSC8211 PHY? A simple way to test this should be to connect the VSC8211 to a 100 mpbs switch - this should work fine via SGMII but not 1000 base-X (assuming you're using a copper interface).
I'm definitely using SGMII with eTSEC2. This is documented in board user manual. Also, eTSEC2 works when connected to 100 mbps switch.
I'm not familiar with how SGMII is configured on this controller, but it appears that Peter's patch turned of Autonegotiation. Why this would make a PHY work and a switch not work is curious... Maybe we should have a CONFIG option for SGMII parameters. Settings could default to the ones Peter set (since he submitted it in November and problems are surfacing now), but could be overriden. Does that sound reasonable? Something like:
#ifndef CONFIG TSEC_TBICR_SETTINGS #define TBICR_SETTINGS ( \ TBICR_PHY_RESET \ | TBICR_FULL_DUPLEX \ | TBICR_SPEED1_SET \ ) #else #define TBICR_SETTINGS CONFIG_TSEC_TBICR_SETTINGS #endif Thanks.
This solution is fine by me. I'd be curious if anyone at Freescale has a definitive answer about SGMII and auto-negotiation. I'm happy to try any patch on Monday
I've posted a patch, see http://lists.denx.de/pipermail/u-boot/2010-June/073208.html
Can you please test it ?
Thanks.
Felix.