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eee2d0b
(Get the code!)
> Finally got it to work by trial and error. If I boot the machine with 'noapic' and remove all splash and
> vga= options I systematically get all cores recognized. Seems like 'noapic' is the real key here.
> Without it, booting can bring up 1, 2 or 4 cores in a seemingly random fashion.
See, that's weird, because it used to be that disabling APIC would disable SMP. Maybe it doesn't work that way anymore, I'll try to give it a shot. Thanks for the workaround!