How to get into ddb after system is booted?

[Paul Goyette <paul%whooppee.com@localhost>]

I've got a system with both serial and USB keyboard attached, and I 
would like to get into ddb after the system has booted (to single-user 
mode).  I've verified that ddb.fromconsole is set and I've used 
hw.cnmagic to create a keystroke sequence "QQ" (0x51 0x51) but it does 
not get me into ddb.


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