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Cortex-M3: Tips/Tricks to debug a Hard Fault?

Any hints, tips or tricks to debug a Cortex-M3: Hard Fault Exception?

It's an STM32, and I'm using the standard Keil STM32F10x.s: Startup file - which contains Dummy Exception Handlers (infinite loops) to "catch" the exception.

So, ahving arrived in the Hard Fault Exception Handler, what should I do next...?

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