add new target 'oxnas'

This is the oxnas target previously developed at
http://gitorious.org/openwrt-oxnas
Basically, this consolidates the changes and addtionas from
http://github.org/kref/linux-oxnas
into a new OpenWrt hardware target 'oxnas' adding support for
 PLX Technology NAS7820/NAS7821/NAS7825/...
formally known as
 Oxford Semiconductor OXE810SE/OXE815/OX820/...

For now there are 4 supported boards:
Cloud Engines Pogoplug V3 (without PCIe)
 fully supported

Cloud Engines Pogoplug Pro (with PCIe)
 fully supported

MitraStar STG-212
 aka ZyXEL NSA-212,
 aka Medion Akoya P89625 / P89636 / P89626 / P89630,
 aka Medion MD 86407 / MD 86805 / MD 86517 / MD 86587
 fully supported, see http://wiki.openwrt.org/toh/medion/md86587

Shuttle KD-20
 partially supported (S-ATA driver lacks support for 2nd port)

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

SVN-Revision: 43388

target/linux/oxnas/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,35 @@
+#
+# Copyright (C) 2014 OpenWrt.org
+#
+
+. /lib/oxnas.sh
+
+RAMFS_COPY_DATA=/lib/oxnas.sh
+
+platform_check_image() {
+	local board=$(oxnas_board_name)
+
+	[ "$ARGC" -gt 1 ] && return 1
+
+	nand_do_platform_check $board $1
+	return $?
+}
+
+platform_do_upgrade() {
+	if [ $$ -ne 1 ]; then
+		echo "not PID 1, upgrade aborted."
+		return 1;
+	fi
+	platform_do_upgrade_phase2 "$1" "$CONF_TAR" "$SAVE_CONFIG"
+}
+
+
+disable_watchdog() {
+	killall watchdog
+	( ps | grep -v 'grep' | grep '/dev/watchdog' ) && {
+		echo 'Could not disable watchdog'
+		return 1
+	}
+}
+
+append sysupgrade_pre_upgrade disable_watchdog