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


Michael Ellerman
IBM OzLabs

phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
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