add a sparc64 installboot script. just dd the bootblk to the right part of the disk. can be improved...

sys/arch/sparc64/stand/installboot/Makefile

@@ -0,0 +1,6 @@
+#	$NetBSD: Makefile,v 1.1 1998/11/23 08:15:11 mrg Exp $
+
+NOMAN=		# should have something
+SCRIPTS=	installboot.sh
+
+.include <bsd.prog.mk>

sys/arch/sparc64/stand/installboot/installboot.sh

@@ -0,0 +1,75 @@
+#! /bin/sh
+#
+#	$NetBSD: installboot.sh,v 1.1 1998/11/23 08:15:12 mrg Exp $
+#
+# Copyright (c) 1998 Matthew R. Green
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 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. 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 THE AUTHOR ``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 AUTHOR 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.
+
+usage='installboot [-vd] <bootblk> <disk>'
+
+verbose=0
+debug=0
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+		-d)
+			debug=1
+			shift
+			;;
+		-v)
+			verbose=1
+			shift
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			echo $usage
+			exit 1
+			;;
+		*)
+			break
+			;;
+	esac
+done
+
+blk=$1
+disk=$2
+if [ -z "$blk" -o -z "$disk" ]; then
+	echo $usage
+	exit 1
+fi
+
+cmd="dd if=$blk of=$disk bs=512 conv=notrunc seek=1"
+
+if [ $verbose = 1 ]; then
+	echo $cmd
+fi
+
+if [ $debug = 0 ]; then
+	$cmd
+fi