CH_CSR
if (sc->sc_chbase[CH_CSR] != csr) {
sc->sc_chbase[CH_CSR] = csr;
sc->sc_qr.qr_ch_regs[0].qr_csr = CH_CSR(0);
sc->sc_qr.qr_ch_regs[1].qr_csr = CH_CSR(1);