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