I'm trying to understand the constraints around the value used with 
MEMFD_BASE_ADDRESS?

The reason I'm asking is I've been asked to remove firmware from using lower 
memory addresses in the low 0x800000 range as it is taking up too many ASLR 
bits in low memory VMs or some such. 

At least on my OVMF config that seems to be PcdOvmfLockBoxStorageBase and 
PcdOvmfPeiMemFvBase. It is easy enough to move MEMFD_BASE_ADDRESS to a much 
higher address, but I'm not sure if there are any restrictions to the addresses 
I can use?

Thanks,

Andrew Fish
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