Fixing SMP on MacBooks

[Rui Paulo]

At Fri, 11 May 2007 11:55:38 +0100,
Rui Paulo wrote:
> 
> At Fri, 11 May 2007 12:19:37 +0200,
> Florian C. Smeets wrote:
> > 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA512
> > 
> > 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.
> 
> Have you tried pressing a key?
> I also have a first rev MBP and it works.

Oops, sorry, I don't have a MackBook Pro. I have a MacBook.
Do you really have a MacBook Pro? AFAIK that trick never worked on the
Pro version.

--
Rui Paulo