Re: cx88 pci_abort messages

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On Oct 8, 2007, at 3:44 AM, Gerd Hoffmann wrote:

Scott wrote:
On Sat, 2007-10-06 at 12:48 -0600, Robert Hancock wrote:
Oct  2 21:59:32 htpc cx88[0]: irq mpeg  [0x80000] pci_abort*
Oct  2 21:59:32 htpc cx88[0]/2-mpeg: general errors: 0x0008000
I assumed it was an interrupt issue based on the 'irq mepg' error, not a
DMA issue.
It's a DMA issue. The chip raised an irq to signal the error
to the driver, thats why it is printed by the irq handler.  Happened
while streamimg mpeg data.

Havn't looked at the code for years now, but IIRC the 0x800000 is the
raw error code from some status register, pci_abort is the error bit in
clear text, meaning some PCI DMA transfer was aborted.  No idea why
though ...
I went through and did the basics. Disabled SMP (it's a core 2 duo
cpu), tried with noapic, nolapic settings, tried with pci=irqroute,
and tried with acpi=off. Poking through the module code I noticd in
cx88-mpeg.c the irq_debug option. I think this is the debug switch I
want so I'll try to gather more info this week. At the very least it
looks like it will help me walk through the code to get a better idea
of what's going on.

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