IRQM
np->rv_dcntl |= IRQM;
np->rv_dcntl |= (np->sv_dcntl & IRQM);
OUTB(np, nc_dcntl, (np->rv_dcntl & IRQM));
np->rv_dcntl |= IRQM;
np->rv_dcntl |= (np->sv_dcntl & IRQM);
np->rv_dcntl & IRQM ? "totem pole" : "open drain",