From: andrew@lunn.ch (Andrew Lunn)
To: linux-arm-kernel@lists.infradead.org
Subject: [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@lunn.ch>
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
WARNING: multiple messages have this Message-ID (diff)
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
<dann.frazier-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>,
Eran Ben-Avi <benavi-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Leif Lindholm <leif.lindholm-5wv7dgnIgG8@public.gmane.org>,
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
next prev parent reply other threads:[~2013-01-31 16:38 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-30 17:26 [PATCH] Adding support for the new Armada XP evaluation board from Marvell Gregory CLEMENT
2013-01-30 17:26 ` [PATCH] arm: mvebu: support for the new Armada XP evaluation board(DB-MV784MP-GP) Gregory CLEMENT
2013-01-30 17:28 ` Florian Fainelli
2013-01-30 17:33 ` Gregory CLEMENT
2013-01-30 17:33 ` Jason Cooper
2013-01-30 17:35 ` Gregory CLEMENT
2013-01-30 18:10 ` Jason Cooper
2013-01-30 18:10 ` Jason Cooper
2013-01-31 9:50 ` Andrew Lunn
2013-01-31 9:50 ` Andrew Lunn
2013-01-31 10:07 ` Thomas Petazzoni
2013-01-31 10:07 ` Thomas Petazzoni
2013-01-31 12:02 ` Gregory CLEMENT
2013-01-31 12:02 ` Gregory CLEMENT
2013-01-31 12:44 ` Jason Cooper
2013-01-31 12:44 ` Jason Cooper
2013-01-31 12:07 ` Gregory CLEMENT
2013-01-31 12:07 ` Gregory CLEMENT
2013-01-31 12:45 ` Jason Cooper
2013-01-31 12:45 ` Jason Cooper
2013-01-31 12:50 ` Gregory CLEMENT
2013-01-31 12:50 ` Gregory CLEMENT
2013-01-31 12:52 ` Jason Cooper
2013-01-31 12:52 ` Jason Cooper
2013-01-31 16:22 ` Andrew Lunn
2013-01-31 16:22 ` Andrew Lunn
2013-01-31 16:38 ` Andrew Lunn [this message]
2013-01-31 16:38 ` Andrew Lunn
2013-01-31 21:08 ` Arnd Bergmann
2013-01-31 21:08 ` Arnd Bergmann
2013-01-30 19:30 ` Florian Fainelli
2013-01-31 8:50 ` Gregory CLEMENT
2013-01-31 9:20 ` Simon Guinot
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