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SubjectRe: PATCH 2.5.x disable BAR when sizing
Linus Torvalds writes:

> Actually, I think it's certainly valid to not allow "printk()" to happen
> around the BAR probing, at least at bootup when we control all the CPU's
> tightly anyway.

I'd like us to disable interrupts too. On powermacs, the interrupt
controller is typically inside a combo I/O ASIC which is on the PCI
bus. If we take an interrupt while the ASIC's BAR is relocated or
turned off, we will get a machine check when we try to access the
interrupt controller and the kernel will die at that point.

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