Hi Bob,
You can configure the debug through the Debug as ¦ Debug configurations ...
For Debug session type instead of Download you can select Attach or connect
In this case when you will launch a debug session, the application is not load on board.
Only connection to the board is done.

For details please have a look to the post:
Hot-Sync: Attach, Connect & Download | MCU on Eclipse
the options are changed but descriptions are still valid.
Have a great day,
Pascal Irrle
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