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From: Lucio Dona' <memorylost@tin.it>
To: linux-mips@linux-mips.org
Subject: AU1100 Ethernet problems
Date: Tue, 13 Feb 2007 07:03:46 +0100	[thread overview]
Message-ID: <45D154C2.9030809@tin.it> (raw)

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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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             reply	other threads:[~2007-02-13  6:04 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-13  6:03 Lucio Dona' [this message]
2007-02-13  7:49 ` AU1100 Ethernet problems Michael Stickel

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