4.12.4. Support for the ICE Extension Unit

Multi-ICE includes support for the ARM ICE Extension Unit (IEU). This is a logic block that can be added to a processor when it is built and that extends the number of breakpoint units available to the debugger.

If this unit is present, it is used automatically. The IEU breakpoint registers are numbered from two to 31. The corresponding icebreaker_lockedpoints bits are 0x4 to 0x80000000.

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