BGE_TX_MODE
tx_mode = CSR_READ_4(sc, BGE_TX_MODE);
CSR_WRITE_4(sc, BGE_TX_MODE, tx_mode);
mode = CSR_READ_4(sc, BGE_TX_MODE);
mode |= CSR_READ_4(sc, BGE_TX_MODE) &
CSR_WRITE_4(sc, BGE_TX_MODE, mode | BGE_TXMODE_ENABLE);