xxboot is called biosboot here

src/etc/etc.amd64/MAKEDEV.md

@@ -1,5 +1,5 @@
 vers(__file__,
-	{-$OpenBSD: MAKEDEV.md,v 1.1 2004/01/28 02:11:53 mickey Exp $-},
+	{-$OpenBSD: MAKEDEV.md,v 1.2 2004/02/07 20:30:59 deraadt Exp $-},
 etc.MACHINE)dnl
 dnl
 dnl Copyright (c) 2001,2002,2003 Todd T. Fries <todd@OpenBSD.org>
@@ -90,6 +90,7 @@ _DEV(iop, 75)
 _DEV(radio, 76)
 _DEV(systrace, 78)
 _DEV(gpr, 80)
+_DEV(ptm, 81)
 _DEV({-usbs-})
 #
 dnl

src/etc/etc.amd64/Makefile.inc

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.1 2004/01/28 02:11:53 mickey Exp $
+#	$OpenBSD: Makefile.inc,v 1.2 2004/02/07 20:30:59 deraadt Exp $
 
 .ifdef DESTDIR
 snap_md: boot bsd distrib
@@ -11,7 +11,7 @@ bsd:
 	    ${MAKE} clean && ${MAKE} depend && exec ${MAKE}
 
 boot:
-	cp ${DESTDIR}/usr/mdec/xxboot ${DESTDIR}/snapshot
+	cp ${DESTDIR}/usr/mdec/biosboot ${DESTDIR}/snapshot
 
 .PHONY: bsd