/dev/mem contains physical memory addresses?

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Hi list,

I read that the /dev/mem represents the memory of the system.

1) Does that mean I can if start reading from /dev/mem, I can read any
portion of the memory?

2) If I read at offset "n" in the file /dev/mem, would I be reading
contents of the PHYSICAL memory address "n", or the VIRTUAL memory
addtress "n"?

Thanks,

Dan.
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