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AU1100 Ethernet problems

Subject: AU1100 Ethernet problems
From: Lucio Dona' <>
Date: Tue, 13 Feb 2007 07:03:46 +0100
Original-recipient: rfc822;
User-agent: Mozilla Thunderbird (X11/20070102)
Hi all,
I am working on an AU1100 project and I found problems in some pre-production boards.

When the boards are powered up without Ethernet cable plugged-in, and the Ethernet is initialized, it seems that the system gets a lot of 'rx interrupts' and stays almost all the time inside the Ethernet rx interrupt service routine. This horribly slows down everything and causes the watchdog to come up resetting the board.

Tried to make some debugging, but don't understand why there are all those interrupts.

If the system is powered up with the Ethernet cable connected to a simple hub (hub only, no other computers connected to the net) the problem does not occur.

I have this problem on about 10% boards.
The design is based on AMD Syrah reference schematics, the kernel is 2.4.21-pre4. Searching with oscilloscope there is no apparent 'hardware' difference between a 'bad' board and a good one.

Any suggestions ?

Thanks, regards
Lucio Dona'

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