MIDX_DESCSTART   1423 dev/ic/midway.c     EN_WRITE(sc, MIDX_DESCSTART(slot), 0);
MIDX_DESCSTART   2029 dev/ic/midway.c 	EN_READ(sc, MIDX_DESCSTART(chan)));
MIDX_DESCSTART   3134 dev/ic/midway.c 	  EN_READ(sc, MIDX_READPTR(slot)), EN_READ(sc, MIDX_DESCSTART(slot)));