Fixing SMP on MacBooks

[Florian C. Smeets]

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Rui Paulo wrote:
> Hi,

Hi!

> I would like to bring this discussion to a wider audicence.
> 
> So, here's the problem:
> As some of you already know, the second core on Apple's MacBooks fails
> to start. There are two nasty tricks to make it start (both involve
> interactivity from the user) that I know of.
> 
> They are:
> 	1) Press the power button during the IPI timeout;
> 	2) Press a key [1] before the IPIs are sent *OR* during the
> 	   IPI timeout.
> 
> [1] This is really an interrupt. Pressing the Fn key doesn't work
> because the Fn key doesn't generate an interrupt.
> 
> There tricks don't work on the MacBook Pro. While the source of the
> problem might be the same, it's not clear why the tricks work.
> 

Well i was able to boot a 7-CURRENT snapshot from February or March on a
first rev. MBP and it did recognize the second core when pressing the
power button right after this line:

 ACPI APIC Table: <APPLE  Apple00>

This used to work reliably.

Thanks for working on the MacBook support for FreeBSD! I will be setting
up a partition for FreeBSD again this weekend. So if you have anything
to test you can count me in :-)

Cheers
Florian
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