Question

How do i find out what memory addresses are suitable for use ?

More specifically, the example of How to use a specific address is here: Pointer to a specific fixed address, but not information on Why this is a valid address for reading/writing.

I would like a way of finding out that addresses x to y are useable.

This is so i can do something similar to memory mapped IO without a specific simulator. (My linked Question relevant so i can use one set of addresses for testing on Ubuntu, and another for the actual software-on-chip)

Ubuntu specific answers please.

Answer 1

You can use whatever memory address malloc() returns. Moreover, you can specify how much memory you need. And with realloc() you even can change your mind afterwards.