[BUG] 2.6.28-git12: "powerpc/pci: Reserve legacy regions on PCI" broke my G3

[BUG] 2.6.28-git12: "powerpc/pci: Reserve legacy regions on PCI" broke my G3

[Mikael Pettersson]

The 2.6.29-rc kernels hang during boot on my PowerMac G3 (Beige).
The last messages I see on the console are

Kernel command line: ramdisk_size=8192
irq: Found primary Apple PIC /pci/mac-io for 64 irqs
irq: System has 64 possible interrupts

and then it hangs until I reboot it. Unfortunately I don't have a serial cable
compatible with the G3's serial port so I can't set up a serial console.

Eventually I narrowed the cause down to "powerpc/pci: Reserve legacy regions on PCI"
(commit c1f343028d35ba4e88cd4a3c44e0d8b8a84264ee) in 2.6.28-git12. Reverting that
from 2.6.29-rc2 results in a kernel that boots ok and works reliably.

The problem seems system specific as both my G5 and my G4 had no problems at all
with 2.6.29-rc1.

/Mikael

Re: [BUG] 2.6.28-git12: "powerpc/pci: Reserve legacy regions on PCI" broke my G3

[Benjamin Herrenschmidt]

On Sat, 2009-01-17 at 23:46 +0100, Mikael Pettersson wrote:
> The 2.6.29-rc kernels hang during boot on my PowerMac G3 (Beige).
> The last messages I see on the console are
> 
> Kernel command line: ramdisk_size=8192
> irq: Found primary Apple PIC /pci/mac-io for 64 irqs
> irq: System has 64 possible interrupts
> 
> and then it hangs until I reboot it. Unfortunately I don't have a serial cable
> compatible with the G3's serial port so I can't set up a serial console.
> 
> Eventually I narrowed the cause down to "powerpc/pci: Reserve legacy regions on PCI"
> (commit c1f343028d35ba4e88cd4a3c44e0d8b8a84264ee) in 2.6.28-git12. Reverting that
> from 2.6.29-rc2 results in a kernel that boots ok and works reliably.
> 
> The problem seems system specific as both my G5 and my G4 had no problems at all
> with 2.6.29-rc1.

Thanks, I'll try to narrow it down, but it will take a week or so as I'm
away attending LCA. I think I have one of these Beige G3's in the office
somewhere....

Cheers,
Ben.