From: Scott Wood <scottwood@freescale.com>
To: David Beamonte <dbeamonte@telnet-ri.es>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Interrupts get disabled on USB access on MPC8272
Date: Fri, 26 Sep 2008 11:31:57 -0500 [thread overview]
Message-ID: <48DD0E7D.6030107@freescale.com> (raw)
In-Reply-To: <48DD0169.7090709@telnet-ri.es>
David Beamonte wrote:
> I have debugged the kernel and what I can see is that, once the
> processor tries to send a buffer of the USB controller, interrupts get
> disabled. And so, there is no ethernet, serial port, or whatever way of
> communication to the processor. With my debugger I can see that the
> kernel keeps running and executing cpu_idle() and so on. Furtheremore,
> jiffies increase, but no other interrupts occur.
It's probably waiting for an interrupt that never came.
> It seems to happen when buffers try to access external memory. Can it be
> related to bus arbitration?
Probably not; usually that sort of problem results in a hard lock-up.
-Scott
prev parent reply other threads:[~2008-09-26 16:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-26 15:36 Interrupts get disabled on USB access on MPC8272 David Beamonte
2008-09-26 16:31 ` Scott Wood [this message]
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