This issue was previously identified here: * https://sourceforge.net/p/openocd/mailman/openocd-devel/thread/670d28d2-75a1-45ec-afe5-541415701d7a%40codasip.com/#msg58723494
But I can't see that any patch was ever submitted to fix the issue - e.g. by changing to Z and z for millisecond and microsecond sleeps respectively.
