GRETH_TXI
GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
ctrl | GRETH_TXI | GRETH_RXI);