Introduced lib/boot/boot.in as a wrapper to the boot code of the active bootloaders, handling extensions from the architecture and overloads from the target.

lib/boot/boot.in

@@ -0,0 +1,49 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: lib/boot/boot.in
+# Copyright (C) 2008 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License. A copy of the
+# GNU General Public License can be found in the file COPYING.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+# by default we will peek the first suitable bootloader found
+#
+boot_choose_bootloader() { head -n 1; }
+
+# variables
+#
+bootloader=
+
+# load stuff from the architecture, if anything to load.
+[ ! -s "architecture/$arch/boot.in" ] || . "architecture/$arch/boot.in"
+# and allow targets to overload these functions and variables
+[ ! -s "target/$target/boot.in" ] || . "target/$target/boot.in"
+
+
+# if the target didn't choose one already, find the suitables and choose one
+if [ -z "$bootloader" ]; then
+	bootloader="$(
+	    ls -1d `sed -n -e 's,^X [^ ]\+ [^ ]\+ \([^ ]\+\) \([^ ]\+\) .* BOOT .*,package/\1/\2/boot/boot.in,p' \
+		"config/$config/packages"`  2> /dev/null |
+		cut -d/ -f'2,3' | boot_choose_bootloader )"
+fi
+
+# validate the module, and source.
+#
+if [ -z "$bootloader" ]; then
+	echo_error "boot: couldn't find any suitable bootloader."
+	exit 1
+elif [ ! -e "package/$bootloader/boot/boot.in" ]; then
+	echo_error "boot: '$bootloader' is not suitable."
+else
+	echo_status "boot: using $bootloader."
+fi
+
+. "package/$bootloader/boot/boot.in"
+