TROCR
nstats->tx_dropped += ravb_read(ndev, TROCR);
ravb_write(ndev, 0, TROCR); /* (write clear) */
[TROCR] = 0x03d0,
add_reg(TROCR);
[TROCR] = 0x01d0,
sh_eth_update_stat(ndev, &ndev->stats.tx_dropped, TROCR);
[TROCR] = 0x0180,
[TROCR] = 0x0700,