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 _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss
