I'm unfamiliar with bootdreams; does it automatically generate an ip.bin file for you? If not, you may have to add one yourself. I just plucked the ip.bin from another DC emulator and dropped it into the root directory.
You may want to double-check to make sure you've got the proper bios files, as well. It took me a few tries to find the right ones. That guide on dreamcast-scene is excellent (thanks, Christuserloeser!) and should steer you right. I, personally, am a blithering idiot, and even I managed to get it working
Hope this helps, good luck.
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