[linux-dvb] saa7134 bug in 64 bits system

Mathieu Taillefumier mathieu.taillefumier at free.fr
Mon Oct 13 09:55:00 CEST 2008

> With a diff of the dmesg files, I noticed things are being detected and
> configured slightly differently.  I'm not sure that's important, but
> this one in particular caught my eye:
>      ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
>     -ACPI: Skipping IOAPIC probe due to 'noapic' option.
>     +ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])
>     +IOAPIC[0]: apic_id 1, version 0, address 0xfec00000, GSI 0-23
> Any particular reason you're specifying noapic for 32 bit and not for 64
> bit?
Well, not anymore. I had trouble with some old kernels that did not want 
to boot correctly from time to time and putting noapic was helping a bit.
> Again, I'm not sure if it's important, but if you are troubleshooting
> between 2 setups, you want to eliminate as many unknowns as possible by
> keeping things the same as much as you can.
I do agree with you but the thing is that the config options for 32bits 
and 64bits are not completely identical either. I recompiled the kernel 
yesterday for both 32 and 64 bits and I discover for instance that the 
initialization of the tvcard is wrong in 32bits when the option 
CONFIG_RESOURCES_64bits is enabled. The gpio is correct but the rest of 
the output are obviously wrong.
> I'm wagering it's a PCI bus configuration/setup problem.  (*guess*)
> Given that it looks like your video card is a PCMCIA/CardBus card, maybe
> something with the Yenta driver is not right. (*Wild guess*)
> This message, that only appeared in dmesg-64, may be of concern, since
> you're using a PCMCIA/CardBus card:
>     cs: pcmcia_socket0: unable to apply power.
>     pccard: CardBus card inserted into slot 0
I was able to reproduce it but curiously the power is not restored when 
I unload the driver, disconnect the card and put the card again in the 
slot (after 1 minute). I have to do a reboot to turn the card on.
>> I am willing to help
>> the devs to track down this bug so please let me know if you need some help.
>> Those are just WAGs as to what might be wrong.  More differential
>> analysis of the dmesg and dmesg-64 files may help you narrow things
>> down.  I will think you'll need to expand your search beyond the saa7134
>> driver messages - to me they appear to be symptoms caused by a problem
>> with something else.  Good luck.
I think I will need some. Anyway thank you for the help.



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