[U-Boot] Link problem with eTSEC2 on P2020RDB

[Felix Radensky <felix@embedded-sol.com>]

Hi Ben,

On 6/26/2010 8:22 AM, Ben Warren wrote:
> Hi Felix,
>
> On Fri, Jun 25, 2010 at 4:33 AM, Felix Radensky 
> <felix at embedded-sol.com <mailto:felix@embedded-sol.com>> wrote:
>
>     Hi Ben,
>
>     Peter Tyser seems to be OOO until Monday, so maybe you can comment
>     on this problem,
>     as it's network related.
>
>     Peter's patch comes to fix a problem with ethernet not working on
>     XES 8572 board using
>     BCM5482S PHY in SGMII mode.  On the other hand it breaks eTSEC2 on
>     P2020RDB
>     board using VSC8211 PHY in SGMII mode. On P2020RDB not only
>     u-boot, but also
>     Linux cannot use eTSEC2.
>
>
>     Do you have any suggestions how to make both boards happy ?
>
> 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...

VSC8211 on P2020RDB is a PHY, not a switch. There can be some SGMII 
related problem in MPC8572 that
was fixed in P2020, but it's just a wild guess.

>  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.
>
>     Felix.
>
> If you put together a patch that does this and test it on your board, 
> that should be good enough.  Peter can try it out when he gets back.
>

I'll create a patch based on your suggestion later today or tomorrow and 
test it on P2020RDB and P1020RDB.

Felix.