linux-kernel - Re: [08/36] AArch64: Kernel booting and initialisation

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Message-ID: <500DB986.7090309@codeaurora.org>
Date:	Mon, 23 Jul 2012 16:52:22 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	Stephen Warren <swarren@...dotorg.org>
CC:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Will Deacon <will.deacon@....com>
Subject: Re: [08/36] AArch64: Kernel booting and initialisation

Hi Catalin and Stephen,

Catalin Marinas - July 8, 2012, 9:18 a.m.
> On Fri, Jul 06, 2012 at 10:32:54PM +0100, Stephen Warren wrote:
> 
>> Also, on Tegra at least and perhaps OMAP too, there are a few parts
>> of earlyprintk serial port setup (i.e. port selection) which happen
>> as part of the decompressor rather than the main kernel image, so
>> we'd have to re-jig that too.
> 
> Whatever we did on AArch32, if it was useful and we want to follow a
> similar model it needs porting given that the code cannot be shared. So
> there is nothing to re-jig but rather implement.
> 
> As for earlyprintk, you can initialise it in the decompressed kernel
> anyway. But even though it's a useful debugging tool, it goes against
> the single Image aim (at least the current printascii/addruart
> implementation). I don't have a proper implementation yet.

Would DCC [1] be a reasonably commonly available early printk mechanism
for the single image to provide?

1.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/BEIHGIBB.html

Thanks,
Christopher

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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