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From: Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>
To: Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>
Cc: Lior Amsalem <alior-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
	Ike Pan <ike.pan-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>,
	Nadav Haklai <nadavh-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
	David Marlin <dmarlin-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Yehuda Yitschak <yehuday-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
	Simon Guinot
	<simon.guinot-jKBdWWKqtFpg9hUCZPvPmw@public.gmane.org>,
	Tawfik Bayouk <tawfik-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
	Dan Frazier
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	Sebastian Hesselbarth
	<sebastian.hesselbarth-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Jason Cooper <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>,
	Jon Masters <jcm-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
	Florian Fainelli
	<florian-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	Chris Van Hoof <vanhoof-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>,
	Maen Suleiman <maen-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
	Shadi Ammouri <shadi-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH] arm: mvebu: support for the new Armada XP evaluation board(DB-MV784MP-GP)
Date: Thu, 31 Jan 2013 17:38:14 +0100	[thread overview]
Message-ID: <20130131163814.GE20242@lunn.ch> (raw)
In-Reply-To: <20130131162254.GD20242-g2DYL2Zd6BY@public.gmane.org>

On Thu, Jan 31, 2013 at 05:22:54PM +0100, Andrew Lunn wrote:
> > Well in fact it is 4GB RAM but we can only use 3GB (we need the last GB
> > of address space for peripheral, CPU registers and IOmem).
> 
> Hi Gregory
> 
> Does the CPU support Large Physical Addressing, LPA? Is that on the
> roadmap for Armada?

I did a bit of googling:

http://www.linleygroup.com/newsletters/newsletter_detail.php?num=3982

	To address the cloud-computing market, the company added
	40-bit physical addressing to Armada XP, using a method
	similar to what ARM implemented in Cortex-A15. This feature
	allows the memory controller to support up to one terabyte
	(1TB) of DRAM.

Also:

http://www.theregister.co.uk/2012/10/24/dell_zinc_arm_server_apache_software/

talks about 40-bit.

So it should be possible to use the full 4GBytes of RAM, in theory.

   Andrew

  parent reply	other threads:[~2013-01-31 16:38 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1359566774-27669-1-git-send-email-gregory.clement@free-electrons.com>
     [not found] ` <1359566774-27669-2-git-send-email-gregory.clement@free-electrons.com>
     [not found]   ` <20130130173306.GO7717@titan.lakedaemon.net>
     [not found]     ` <510959D5.1010305@free-electrons.com>
2013-01-30 18:10       ` [PATCH] arm: mvebu: support for the new Armada XP evaluation board(DB-MV784MP-GP) Jason Cooper
     [not found]         ` <20130130181035.GP7717-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org>
2013-01-31  9:50           ` Andrew Lunn
     [not found]             ` <20130131095025.GC20242-g2DYL2Zd6BY@public.gmane.org>
2013-01-31 10:07               ` Thomas Petazzoni
2013-01-31 12:02                 ` Gregory CLEMENT
     [not found]                   ` <510A5D38.9040608-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2013-01-31 12:44                     ` Jason Cooper
2013-01-31 12:07           ` Gregory CLEMENT
     [not found]             ` <510A5E87.60509-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2013-01-31 12:45               ` Jason Cooper
     [not found]                 ` <20130131124542.GB7717-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org>
2013-01-31 12:50                   ` Gregory CLEMENT
     [not found]                     ` <510A689B.6040407-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2013-01-31 12:52                       ` Jason Cooper
2013-01-31 16:22                       ` Andrew Lunn
     [not found]                         ` <20130131162254.GD20242-g2DYL2Zd6BY@public.gmane.org>
2013-01-31 16:38                           ` Andrew Lunn [this message]
     [not found]                             ` <20130131163814.GE20242-g2DYL2Zd6BY@public.gmane.org>
2013-01-31 21:08                               ` Arnd Bergmann

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