ETH_MAC2_FD
writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,