FM_PLAY_DMABUF1
fm801_wr(fm801, FM_PLAY_DMABUF1, fm801->play_start,4);
fm801_wr(fm801, FM_PLAY_DMABUF1,fm801->play_start,4);
FM_PLAY_DMABUF2:FM_PLAY_DMABUF1, 4) - fm801->play_start;