GRETH_RXI
GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
if (ctrl & GRETH_RXI)
if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
ctrl | GRETH_TXI | GRETH_RXI);