This evening i looked into the sources. There are a lot of patches for integration of the mid-platform into the kernel and so far i've seen also a patched gcc is necessary (new cpu variant). So i decided it's better to wait because this will eat a lot of time which i need for other projects. At the moment It's easier to modify and build the kernel with the Yocto procedure and simply overwrite kernel and modules in ubilinux. This stuff seems really to be some months too young.
To get a standard usb soundcard working it should be enough to enable the 'snd_usb_audio' module in the kernel configuration. Alsa should see then this device.