> And the only event of interest seems to be transitioning
> from a "running" or "debug-running" state ... to something
> else.  With the only listeners being the TCL shell, or in
> some cases GDB (when a breakpoint or watchpoint fires).

There are other events:

- the target can send messages via DCC
- power outage(which drivers can detect if they support it)
- srst assert/deassert detection. srst can be asserted by
other devices than JTAG, e.g. the CPU itself.


-- 
Øyvind Harboe
Embedded software and hardware consulting services
http://consulting.zylin.com
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