I have just created a wikipage to answer the question: https://sourceforge.net/apps/mediawiki/tianocore/index.php?title=ArmPlatform Pkg/SparseMemory ... and added support for the ARM Base and Foundation FVP models in SVN 15461 - ArmPlatformPkg/ArmVExpressLibRTSM: Added support for the additional 2GB memory of DRAM on FVP.

Here is the example of the Foundation Model DRAM: 0x00_8000_0000 0x00_FFFF_FFFF DRAM (0GB - 2GB) DRAM (0GB - 2GB) 2GB S/NS 0x08_8000_0000 0x09_FFFF_FFFF DRAM (2GB - 8GB) DRAM (2GB - 8GB) 6GB S/NS Source: http://infocenter.arm.com/help/topic/com.arm.doc.dui0677c/BBACIHDC.html

Note: I only added 2GB from the extra 6GB because the Base FVP model has only 2GB by default at 0x08_8000_0000.

-----Original Message----- From: Andrew Fish [mailto:afish@apple.com] Sent: 11 April 2014 16:43 To: edk2-devel@lists.sourceforge.net Cc: Olivier Martin; linaro-uefi@lists.linaro.org Subject: Re: [edk2] Passing Non-contiguous memory map to kernel on ARMv8

On Apr 11, 2014, at 3:11 AM, Youngmin Nam youngmin.nam@samsung.com wrote:

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Hello Olivier and Expert,

I am trying to pass the non-contiguous physical memory map to kernel

on ARMv8.

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Can the UEFI pass non-contiguous physical memory area to the kernel?

Yes

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I mean, Physical memory is divided into 0x80000000-0xFFFFFFFF(2GB)

and 0x880000000- 0xFFFFFFFFF(30GB).

...

If possible, Could you explain how to describe in UEFI?

The platform passes up the info in the EFI Memory map. So that is a gBS->GetMemoryMap() call. The shell has a memmap command that dumps the data.

How to add memory regions is not defined in UEFI, but it is defined in PI.

The region is added via gDS->AddMemorySpace()

The initial map is based on EFI_HOB_TYPE_RESOURCE_DESCRIPTOR HOBs passed into the DXE Core

https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Core/Dxe/Gc d/Gcd.c CoreInitializeGcdServices()

So platform specific code needs to build the HOB or call gDS-

...

AddMemorySpace().

Thanks,

Andrew Fish

...

Otherwise, Could you let me know the reason?

Thanks,

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