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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [RFC PATCH 10/19] powerpc: gamecube/wii: early debugging using
	usbgecko
Date: Thu, 26 Nov 2009 23:54:57 +0100
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Albert Herranz <albert_herranz@yahoo.es>, linuxppc-dev@lists.ozlabs.org,
	Arnd Bergmann <arnd@arndb.de>
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>> This will probably break other platforms if
>> CONFIG_PPC_EARLY_DEBUG_USBGECKO
>> is set. In general, we try hard to make it possible to build generic
>> kernels for multiple systems, so it would be better to also add a
>> runtime check here.
>
> No Arnd. The whole point of EARLY_DEBUG is that it is -known- to break
> other platforms :-) So that we can use it before we even get to probe
> anything.
>
> I am still tempted, one day, to change the kernel early init to  
> setup a
> stack in .bss and go straight to C to do that sort of stuff by parsing
> the flat DT, this could be done using pretty much completely generic
> code :-) But not right now.

No Ben.  The whole point of EARLY_DEBUG is that it _always works_,  
because
it is such trivial code.  Don't break that please, or we'll be forced to
add a "REALLY_EARLY_DEBUG" instead :-)


Segher