Mike Gorchak announced that VIA SouthBridge VT8233C, VT8233, VT8233A (maybe VT8231, VT8235, not tested yet) audio driver available for download from:
http://mike.qnx.org.ru/vt8233/vt8233-bin-rc5.tar.gz
http://mike.qnx.org.ru/vt8233/vt8233-src-rc5.tar.gz
The main page will be soon available (next week) at http://mike.qnx.org.ru/vt8233.