ENVY24HT_E2PROM_SUBDEVICE
buff->subdevice = envy24ht_rdrom(sc, ENVY24HT_E2PROM_SUBDEVICE) << 8;
buff->subdevice += envy24ht_rdrom(sc, ENVY24HT_E2PROM_SUBDEVICE + 1);
buff->subdevice = envy24ht_rdrom(sc, ENVY24HT_E2PROM_SUBDEVICE) << 8;
buff->subdevice += envy24ht_rdrom(sc, ENVY24HT_E2PROM_SUBDEVICE + 1);