From: Arnd Bergmann <arnd-r2nGTMty4D4@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 21:08:09 +0000 [thread overview]
Message-ID: <201301312108.10046.arnd@arndb.de> (raw)
In-Reply-To: <20130131163814.GE20242-g2DYL2Zd6BY@public.gmane.org>
On Thursday 31 January 2013, Andrew Lunn wrote:
> 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.
But is it actually using the same page table layout as LPAE or just
something "similar"?
Note that there is also 36-bit addressing in certain CPUs, which is
far less useful in general, but which could actually help here if you
can remap the MMIO registers above 4GB to free up the 32-bit space
for RAM.
Arnd
prev parent reply other threads:[~2013-01-31 21:08 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
[not found] ` <20130131163814.GE20242-g2DYL2Zd6BY@public.gmane.org>
2013-01-31 21:08 ` Arnd Bergmann [this message]
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