This is in aarch64 UEFI context.

The efi stub code ignores any memory nodes in the device tree. It only relies 
on the UEFI memory map for memory info.

In such a scenario, how can one export discontiguous regions of system memory 
to the efi stub? There seems to be only one way to inform UEFI about system 
memory, via PcdSystemMemoryBase.

Looking at the latest Arm Juno code, it seems like building a memory resource 
descriptor hob, for the extra memory region, does the trick. Would that be the 
best way to go?

Suggestions please.

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