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The Remote Debug Interface (RDI) is an ARM standard procedural interface between a debugger and the debug agent (see Figure 1.1).
RDI gives the debugger a uniform way to communicate with:
a debug agent running on the host (for example, RealView ARMulator ISS)
a debug monitor running on ARM-based hardware accessed through a communication link (for example, Angel)
a debug agent controlling an ARM processor through hardware debug support (for example, Multi-ICE).