HARMONY_RNXTADD
WRITE_REG(sc, HARMONY_RNXTADD, nextaddr);
SYNC_REG(sc, HARMONY_RNXTADD, BUS_SPACE_BARRIER_WRITE);
WRITE_REG(sc, HARMONY_RNXTADD,
SYNC_REG(sc, HARMONY_RNXTADD, BUS_SPACE_BARRIER_WRITE);