RE: Unhandled interrupt 0, disabled

Mr. Ferri,

I've started a thread of discussion about that a couple of weeks ago, but I
didn't have a satisfying answer. However, I've proposed a fix which seems to
work. I think I should go further with Motorola about that problem. Can you
take a look at it and tell me if it helps? Also, can you tell me which
processor mask you are running on?

Look at
http://lists.linuxppc.org/linuxppc-embedded/200204/threads2.html#00074

The thread is titled:
  8260 - Spurious interrupt when calling __sti()

--------------------------------------------
 Jean-Denis Boyer, B.Eng., System Architect
 Mediatrix Telecom Inc.
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-----Original Message-----
From: Steve.Ferri@radisys.com [mailto:Steve.Ferri@radisys.com]
Sent: 3 mai, 2002 09:04
To: linuxppc-embedded@lists.linuxppc.org
Subject: Unhandled interrupt 0, disabled



All:

I have run different kernel versions (2.4.7 to 2.4.15) on an the 8260
based card we are using.  After the
kernel has been loaded, I always seem to see the message "Unhandled
interrupt 0, disabled".
It doesn't always occur at the same time.  I've seen the message right
after the kernel has finished
booting, after i started my application, or initialized some
drivers.  It
occurs only once.

Looking at the 8260 manual IRQ 0 is described as "Error (No
Interrupt)".
Looking at the code in irq.c
this event doesn't hurt anything, and most likely can be
ignored.  I just
want to understand
how this interrupt vector is getting to the irq_distacher.
Also, should I
be concerned about this
or should I just continue to ignore the event ?

Also this is marked in the /proc/interrupts  file under the BAD: entry
(counted as a spurious interrupt)

              CPU0
 13:       8629            8260 SIU   Edge      timer_irq
 19:          0                8260 SIU   Edge      qfalc_irq
 21:          1                8260 SIU   Edge      pci_irq
 33:       25438          8260 SIU   Edge      fenet
 36:       29585934   8260 SIU   Edge      mcc1_irq
BAD:          1

Perhaps this just always occurs in 8260's after boot ?

Regards,
Steve

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Steve Ferri                         Radisys Corporation
                                               520 Fellowship Rd.
                                               Suite C-304
www.radisys.com             Mt. Laurel, NJ 08054

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