LAN9118_TX_FIF_SZ
KASSERT(LAN9118_TX_FIF_SZ >= 2 && LAN9118_TX_FIF_SZ < 15);
sc->sc_afc_cfg = afc_cfg[LAN9118_TX_FIF_SZ];
hw_cfg |= LAN9118_HW_CFG_TX_FIF_SZ(LAN9118_TX_FIF_SZ);
#ifndef LAN9118_TX_FIF_SZ
#define LAN9118_TX_DATA_FIFO_SIZE (LAN9118_TX_FIF_SZ * 1024 - 512)