My code access memory-address range starting from 0x8001180000000000. This is
legitimate access.
But *what* does it access? Is it a memory-mapped hardware device, or is it
real RAM?
Actual memory can be accessed in smaller or larger pieces in any order,
and give consistent answers. Many hardware devices cannot. If
0x8001180000000000
is a hardware device, then put a logic analyzer on the bus and find out exactly
what is going on.
If it's supposed to be actual RAM, then invoke valgrind with
--trace-notbelow=0 --trace-flags=10000000
(warning: many megabytes of output) and examine the accesses there.
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