CUE_ETHCTL
CUE_SETBIT(sc, CUE_ETHCTL, CUE_ETHCTL_PROMISC);
CUE_CLRBIT(sc, CUE_ETHCTL, CUE_ETHCTL_PROMISC);
cue_csr_write_1(sc, CUE_ETHCTL, 0);
cue_csr_write_1(sc, CUE_ETHCTL, ctl);