BHASH1
bmwrite(dev, BHASH1, bp->hash_table_mask[2]); /* bits 47 - 32 */
bmwrite(dev, BHASH1, bp->hash_table_mask[2]); /* bits 47 - 32 */
bmwrite(dev, BHASH1, 0xffff);
bmwrite(dev, BHASH1, hash_table[1]);