I've gotten my hands on some AntMiner U2s but bfgminer is not seeing them.
This is on a Raspi.
./bfgminer-3.10.0/bfgminer -S antminer:all -o stratum.myfuckingpool.com:3333 -u demonmaestro_usb -p 1
I got my Antminer U2 today also, no luck so far. I'm using Windows 7 Pro 32-bit. SiLab drivers installed. Windows sees the device in corect port. The miner has a steady Red LED but BFGMiner has No New Device Found. I can't find any info from Bitmain for these either. Well, except for pricing.
Have you tried giving the COM port numbers in the command line?
Something like this... -S \\.\COM1 or the COM port of your U2 antminer.
For example .. my run command bat file is:
bfgminer.exe -o ppc.fixx.ru:8437 -u xxxx.ppc01 -p xx1 -S \\.\COM3 -S \\.\COM4 -S \\.\COM8 -S \\.\COM9 -S antminer:all --set-device antminer:clock=x0981 --icarus-options 115200:2:2
I have a vista laptop and BFGminer 3.10...
BFGminer works fantastic with my Antminer U1 units and should be same for the U2 units.
By the way be very careful to not add extra spaces in between commands as that will create an error.
best regards