Subject: [PATCH] arm: mvebu: support for the new Armada XP evaluation board(DB-MV784MP-GP)

From: [email-masked] (Andrew Lunn)
Date: Thu, 31 Jan 2013 17:38:14 +0100

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