You may need to look in /dev/rdsk
/dev/hd** is the block device, /dev/rdsk/*s* is the character based device. I think divvy want the character based one.
ls /dev/rdsk | grep s0
/dev/rdsk/0s0
/dev/rdsk/1s0,...
If there is a /dev/rdsk/1s0 then you should run:
divvy /dev/rdsk/1s0