diff --git a/sys/sparc64/include/idprom.h b/sys/sparc64/include/idprom.h
index e178b68f01f2..442b6b32bbff 100644
--- a/sys/sparc64/include/idprom.h
+++ b/sys/sparc64/include/idprom.h
@@ -1,9 +1,12 @@
 /*-
- * SPDX-License-Identifier: BSD-4-Clause
+ * SPDX-License-Identifier: BSD-2-Clause-NetBSD
  *
- * Copyright (c) 1993 Adam Glass
+ * Copyright (c) 1996 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Adam Glass.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -12,25 +15,20 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by Adam Glass.
- * 4. The name of the Author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
  *
- * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
  *
- *	from: NetBSD: idprom.h,v 1.2 1998/09/05 23:57:26 eeh Exp
+ *	from: NetBSD: idprom.h,v 1.3 2008/04/28 20:23:58 martin Exp
  *
  * $FreeBSD$
  */
@@ -52,13 +50,14 @@ struct idprom {
 	int	id_date;		/* date of manufacture */
 	u_char	id_hostid[3];		/* ``host id'' bytes */
 	u_char	id_checksum;		/* xor of everything else */
+	/* Note: The rest is excluded from the checksum! */
 	char	id_undef[16];		/* undefined */
 };
 
-#define ID_SUN4_100	0x22
-#define ID_SUN4_200	0x21
-#define ID_SUN4_300	0x23
-#define ID_SUN4_400	0x24
+#define	ID_SUN4_100	0x22	/* Sun 4/100 */
+#define	ID_SUN4_200	0x21	/* Sun 4/200 */
+#define	ID_SUN4_300	0x23	/* Sun 4/300 */
+#define	ID_SUN4_400	0x24	/* Sun 4/400 */
 
 #define IDPROM_VERSION 1