ARM Technical Support Knowledge Articles

Is it possible to configure the ARM9 core to more than 2 hardware breakpoints or watchpoints?

Applies to: ARM926EJ-S

Answer

Unfortunately, not. The ARM9s only have two watchpoint units, both of
which can be used for a single hardware instruction breakpoint or a data access
watchpoint. The ARMv5TE Instruction Set Architecture provides a BKPT
instruction which can be used to add software breakpoints instead of
using a hardware watchpoint unit.

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