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Or1ksim needs an unstall command

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Information:
Type :: REQUEST
Status :: CLOSED
Assigned to :: Jeremy, Bennett

Description:
It is possible to stall the processor model in Or1ksim from the CLI with the "stall" command. This is useful for testing the debug interface, which can unstall the processor via its JTAG interface.

However if the debug interface is not working, or if a remoted debugger is not connected, the only way the processor can be unstalled is by using the "reset" command. Indeed it is possible to stall the processor even if the debug unit is not enabled (!).

Arguably this is a bug, but I've recorded it as a feature to provide an "unstall" command.

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