VTE_MCR1
mcr = CSR_READ_2(sc, VTE_MCR1);
CSR_WRITE_2(sc, VTE_MCR1, mcr | MCR1_MAC_RESET);
if ((CSR_READ_2(sc, VTE_MCR1) & MCR1_MAC_RESET) == 0)
CSR_WRITE_2(sc, VTE_MCR1, MCR1_PKT_LENGTH_1537 |