Okay here goes. Even though I don't have the U3 yet, bitmainUSA let me work on one remotely in the interim so I've merged my own U3 driver into the main cgminer git master and it is now available for testing.
Note the following changes:
You do not need to specify ANY command line parameters to run the U3 (no weird options, timeouts or frequency or voltage required) for it to run at default voltage and frequency.
The default frequency is set to 225Mhz
The default voltage is set to 750mV
In addition, the following parameters are recognised, though the defaults are obviously safest.
--au3-freq Set AntminerU3 frequency in MHz, range 100-250 (default: 225.0)
--au3-volt Set AntminerU3 voltage in mv, range 725-850, 0 to not set (default: 750)
In addition, I have a test windows binary:
http://ck.kolivas.org/apps/cgminer/temp/cgminer.exeOf course this is all new code but so far it's looking stable, but I'm unable to test the windows binary myself.