CR_ENA_TX
ch_base[CH_CR] = CR_ENA_RX | CR_ENA_TX;
ch_base[CH_CR] = CR_ENA_TX;
qvaux_write2(sc, sc->sc_qr.qr_ch_regs[0].qr_cr, CR_ENA_TX | CR_ENA_RX);
qvaux_write2(sc, sc->sc_qr.qr_ch_regs[1].qr_cr, CR_ENA_TX | CR_ENA_RX);