linux-kernel - Re: [PATCH v2 2/9] arm: mvebu: Align the internal registers virtual base to support LPAE

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Message-ID: <515F3E96.4040307@free-electrons.com>
Date:	Fri, 05 Apr 2013 23:13:58 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Ike Pan <ike.pan@...onical.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	David Marlin <dmarlin@...hat.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	Nadav Haklai <nadavh@...vell.com>,
	Jon Masters <jcm@...hat.com>,
	devicetree-discuss@...ts.ozlabs.org,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Nicolas Pitre <nico@...xnic.net>, linux-kernel@...r.kernel.org,
	Maen Suleiman <maen@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v2 2/9] arm: mvebu: Align the internal registers virtual
 base to support LPAE

On 04/05/2013 10:50 PM, Arnd Bergmann wrote:
> On Friday 05 April 2013, Gregory CLEMENT wrote:
>> From: Lior Amsalem <alior@...vell.com>
>>
>> In order to be able to support he LPAE, the internal registers virtual
>> base must be aligned to 2MB.
>>
>> Signed-off-by: Lior Amsalem <alior@...vell.com>
>> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> 
> This is a surprising limitation. Can you extend the above text to go into more
> detail where that alignment requirement comes from?
> 

The explanation I had was that in LPAE section size is 2MB, in earlyprintk we map
the internal registers and it must be section aligned.

> 	Arnd
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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