From: Michael Stickel <michael@cubic.org>
To: linux-mips@linux-mips.org
Subject: Re: AU1100 Ethernet problems
Date: Tue, 13 Feb 2007 08:49:31 +0100 [thread overview]
Message-ID: <45D16D8B.40401@cubic.org> (raw)
In-Reply-To: <45D154C2.9030809@tin.it>
Lucio Dona' wrote:
> 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.
If this is on 10% of the boards I would say it is a production problem.
What PHY do you use and is it properly reseted?
Is there any soldering problem with the PHY. Does it have a ground pad
under the case and is this pad well soldered?
Regards,
Michael
prev parent reply other threads:[~2007-02-13 7:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-13 6:03 AU1100 Ethernet problems Lucio Dona'
2007-02-13 7:49 ` Michael Stickel [this message]
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