2.4 MM overview?

[Kenn Humborg]

I understand that 2.4 no longer maps all physical memory as 2.2
and earlier used to do.

Is there any documentation on this change and how it affects
arch-specific code?

Specifically, we've been basing the VAX port on 2.2 while waiting
for 2.4 to stabilize.  Now we're looking at moving to 2.4.

Thanks,
Kenn


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