On x86 with PAE and 4 gigs of RAM or more, where do memory-mapped I/O
devices get mapped (in the physical address space)? Most PCI devices
can't handle 64-bit addresses. Can PC chipsets physically remap some of
the RAM to above 4 gig? Or do you just lose that much RAM? If both RAM
and some I/O device are mapped to the same location, isn't there a conflict?
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