Re: [PATCH] cardbus: revert IO window limit

[Linus Torvalds <torvalds@osdl.org>]

On Wed, 12 Jul 2006, Alessio Sangalli wrote:
>
> Linus Torvalds wrote:
> 
> > Alessio, try Daniel's patch. We'd love to hear if it works, and in 
> > particular what the dmesg output is (if it does work, it should print out 
> > something like
> > 
> > 	PIIX4 ACPI PIO at 2000-203f
> > 	PIIX4 SMB PIO at 2040-204f
> > 
> > and perhaps even a few "PIIX4 devres X" lines..)
> 
> this is the relevat dmesg output:
> 
> PCI: Probing PCI hardware
> PCI: Probing PCI hardware (bus 00)
> PCI quirk: region 1000-103f claimed by PIIX4 ACPI
> PCI quirk: region 1400-140f claimed by PIIX4 SMB
> PIIX4 devres C PIO at 0398-0399

Thanks, that explains it. Anybody who allocated region 1000 and 1400 would 
clash with the built-in PIIX magic IO regions, and any driver that tried 
to access those regions would instead end up accessing magic SMBus or ACPI 
registers.

So your lock-ups are very understandable indeed, and I'll apply this to 
the standard kernel. MUCH better than reverting the IO window limits.

		Linus
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