beige g3 rage II xf4.0.1 and miBoot

[Michael Schmitz]

> Accessing resources that are not enabled, yes, you get a machine check,
> because the device will not answer your accesses, so the bus will hit a
> timeout, which will be signaled to the processor (was that a PCI master
> abort?), in a way that the processor will throw a machine check
> exception.
>
> And that machine check exception is not recovered from (would that even
> be possible?), hence a plain old kernel panic.

If you do the access protected by something as used by copy_from/to_user
it should be possible to catch the exception (assuming a machine check
will initiate the same exception processing as a bus error does. I'm no
PPC expert :-)

	Michael


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