The current J-Link code and OpenOCD will only allow one instance of
J-Link to function. It is actually possible to add one parameter
to differentiate different unit of J-Link (say through the serial number)
so that multiple instances of OpenOCD can be run with different
J-Link units.

This is probably true also for other USB JTAG debuggers.

Maybe this can be implemented post 0.2.

An example of using multiple units of USB device using serial number
can be found in the pk2cmd code for Microchip PICkit 2.
http://www.microchip.com/pickit2
http://ww1.microchip.com/downloads/en/DeviceDoc/pk2cmdv1.20LinuxMacSource.tar.gz

-- 
Xiaofan http://mcuee.blogspot.com
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