PORT_SIZE
#define BUFF_SIZE HEAD_SIZE + FQDN_SIZE + PACK_SIZE + PORT_SIZE
#define PORT_BASE(hc) ((hc) * PORT_SIZE + PORT_OFFSET)
st + offset + PORT_SIZE - 1, PORT_SIZE, RF_ACTIVE, child);
bus_space_subregion(bst, bsh, offset, PORT_SIZE, &bsh);
st + offset + PORT_SIZE - 1, PORT_SIZE, RF_ACTIVE, child);
bus_space_subregion(bst, bsh, offset, PORT_SIZE, &bsh);