RL_TXSTART_START
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
RL_TXSTART_START) == 0)