RL_TXCFG
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
if ((CSR_READ_4(sc, RL_TXCFG) &
sc->sc_hwrev = CSR_READ_4(sc, RL_TXCFG) & RL_TXCFG_HWREV;
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);