I am not very experienced in sigmatel but you may be interested in these topics:
http://www.mympxplayer.org/1-vt8150....r=asc&&start=0
http://www.mympxplayer.org/sigmatel-...d-vp51957.html
also try sigmatel pages or s1mp3.org
good luck... be carefful and study all before starting doing anything...