NFE_RX_CTL
NFE_WRITE(sc, NFE_RX_CTL, NFE_RX_START);
NFE_WRITE(sc, NFE_RX_CTL, 0);
NFE_WRITE(sc, NFE_RX_CTL, NFE_READ(sc, NFE_RX_CTL) |
rxctl = NFE_READ(sc, NFE_RX_CTL);
NFE_WRITE(sc, NFE_RX_CTL, rxctl);