BD_SC_INTRPT
out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
setbits16(&tbdf->cbd_sc, BD_SC_READY | BD_SC_INTRPT);
iowrite16be(BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP, &rx_bd->cbd_sc);
iowrite16be(BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | BD_SC_LAST,
out_be16(&bdp->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT);
out_be16(&bdp->cbd_sc, BD_SC_INTRPT);
out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_INTRPT);
iowrite16be(BD_SC_EMPTY | BD_SC_INTRPT, &bdp->status);
iowrite16be(BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT, &bdp->status);
iowrite16be(BD_SC_INTRPT, &bdp->status);
iowrite16be(BD_SC_WRAP | BD_SC_INTRPT, &bdp->status);