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Memory space is not always outside of the CPU. For example the tightly coupled memory (TCM) is inside of the core. To make gdb access those kind of memory, we should use Iris memory API to read and write memory. If we access a memory address not inside the CPU with Iris memory API. The CPU would fire a request via amba transport_dbg. So the change also covers the original behavior. Change-Id: Ie223ab12f9a746ebafa21026a8680222f6ebd593 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45581 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>