TDFAR
sh_eth_write(ndev, mdp->tx_desc_dma, TDFAR);
add_reg(TDFAR);
[TDFAR] = 0x00d8,
[TDFAR] = 0x0050,
sh_eth_write(ndev, 0, TDFAR);
[TDFAR] = 0x0014,