WDC_ISA_AUXREG_NPORTS
bus_space_unmap(ch.ctl_iot, ch.ctl_ioh, WDC_ISA_AUXREG_NPORTS);
ia->ia_iobase + WDC_ISA_AUXREG_OFFSET, WDC_ISA_AUXREG_NPORTS,
WDC_ISA_AUXREG_NPORTS, 0, &ch.ctl_ioh))