Re: [RFC/PATCH] Make printk work for really early debugging
From: Michael Ellerman
Date: Thu May 18 2006 - 11:40:46 EST
On Thu, 2006-05-18 at 15:55 +0200, Andi Kleen wrote:
> Michael Ellerman <michael@xxxxxxxxxxxxxx> writes:
> > Currently printk is no use for early debugging because it refuses to actually
> > print anything to the console unless cpu_online(smp_processor_id()) is true.
> On x86-64 this is simply solved by setting the boot processor online very early.
Yeah, someone suggested that. Unfortunately it doesn't work, we actually
want to call printk before we even know which cpu we're on :D
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