apm821xx: add support for the apm821xx device target

This adds a new target for PowerPC APM82181 and APM82161
(464-based) boards, as well as adds support for the booke-wdt
watchdog package.

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>

target/linux/apm821xx/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+. /lib/apm821xx.sh
+
+PART_NAME=firmware
+RAMFS_COPY_DATA=/lib/apm821xx.sh
+
+platform_check_image() {
+	local board=$(apm821xx_board_name)
+
+	[ "$#" -gt 1 ] && return 1
+
+	case "$board" in
+	*)
+		;;
+	esac
+
+	echo "Sysupgrade is not yet supported on $board."
+	return 1
+}
+
+platform_pre_upgrade() {
+	local board=$(apm821xx_board_name)
+
+	case "$board" in
+	*)
+		;;
+	esac
+}
+
+platform_do_upgrade() {
+	local board=$(apm821xx_board_name)
+
+	case "$board" in
+	*)
+		default_do_upgrade "$ARGV"
+		;;
+	esac
+}
+
+platform_copy_config() {
+	local board=$(apm821xx_board_name)
+
+	case "$board" in
+	*)
+		;;
+	esac
+}
+
+disable_watchdog() {
+	killall watchdog
+	( ps | grep -v 'grep' | grep '/dev/watchdog' ) && {
+		echo 'Could not disable watchdog'
+		return 1
+	}
+}
+
+append sysupgrade_pre_upgrade disable_watchdog