ddi_poke8
if (ddi_poke8(devi, (int8_t *)addr,
int ddi_poke8(dev_info_t *dip, int8_t *addr, int8_t val);
if (ddi_poke8(dev, (char *)&zsaddr->zscc_control, '\017')
error = ddi_poke8(rp->child, (int8_t *)virt, b);
error = ddi_poke8(rp->child, (int8_t *)virt, b);