Re: [microblaze-uclinux] NuHo S3/1500 - Ethernet working, but...

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi David,

David Banas wrote:

> I just got a brief glimpse of working Ethernet on this board! I even
> successfully "surfed" the default HTML page, but.
> 
> The connection seems flaky, with the link periodically dropping and strange
> combinations of cable connection orders seeming to matter.
> 
> Does anyone know what this might be a symptom of:
> 
> ---------- Hyperterminal output begins here. ------------------
> eth0: Duplex has been changed: now HALF_DUPLEX
> eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Duplex has been changed: now HALF_DUPLEX
> eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Duplex has been changed: now HALF_DUPLEX
> eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Duplex has been changed: now HALF_DUPLEX
> eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Duplex has been changed: now HALF_DUPLEX
> eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Duplex has been changed: now HALF_DUPLEX
> ---------- Hyperterminal output ends here. ------------------

I see this on occasion, with the xilinx emac conencting to a broadcom 
PHY on the ml401 boards.  However, the worst it gets is sometimes 
toggling once or twice on bootup, then settling down.  Certainly not an 
ongoing thing.

It might be flakey hardware, or bad timing settings in the XEMAC 
hardware parameters that govern its communications with the PHY.

Regards,

John



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