From d89ac480ebaad39d0f1847333e6e750617234af4 Mon Sep 17 00:00:00 2001
From: Oleg Hahm <oleg@hobbykeller.org>
Date: Sun, 20 Sep 2015 18:10:48 +0200
Subject: [PATCH 1/2] atmega: added panic function

---
 cpu/atmega_common/panic.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 cpu/atmega_common/panic.c

diff --git a/cpu/atmega_common/panic.c b/cpu/atmega_common/panic.c
new file mode 100644
index 0000000000..dc5fe06e59
--- /dev/null
+++ b/cpu/atmega_common/panic.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2015 INRIA
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     cpu_atmega_common
+ * @{
+ *
+ * @file
+ * @brief       Crash handling functions implementation for ATmega MCUs
+ *
+ * @author      Oliver Hahm <oliver.hahm@inria.fr>
+ */
+
+#include <avr/wdt.h>
+#include "lpm.h"
+
+void panic_arch(void)
+{
+    wdt_disable();
+#ifdef DEVELHELP
+    /* enter infinite loop, into deepest possible sleep mode */
+    while (1) {
+        lpm_set(LPM_OFF);
+    }
+#endif
+
+}

From 04bda78e7f6234772d45eed69c27736fcd9cc212 Mon Sep 17 00:00:00 2001
From: Oleg Hahm <oleg@hobbykeller.org>
Date: Sun, 20 Sep 2015 21:45:27 +0200
Subject: [PATCH 2/2] examples: removed superfluous blacklisting

ATmega now has a panic function, no need for blacklisting any more.
---
 examples/gnrc_border_router/Makefile | 2 --
 examples/gnrc_networking/Makefile    | 2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/examples/gnrc_border_router/Makefile b/examples/gnrc_border_router/Makefile
index bf3af7f9fc..c0331642f2 100644
--- a/examples/gnrc_border_router/Makefile
+++ b/examples/gnrc_border_router/Makefile
@@ -10,8 +10,6 @@ RIOTBASE ?= $(CURDIR)/../..
 BOARD_INSUFFICIENT_MEMORY := airfy-beacon nrf51dongle nrf6310 pca10000 pca10005 nucleo-f334 \
                              spark-core stm32f0discovery yunjia-nrf51822
 
-BOARD_BLACKLIST := arduino-mega2560     # panic_arch not defined
-
 ifeq (,$(SLIP_UART))
   # set default (last available UART)
   SLIP_UART="(UART_NUMOF-1)"
diff --git a/examples/gnrc_networking/Makefile b/examples/gnrc_networking/Makefile
index 3c19daef3f..e0b2be14ac 100644
--- a/examples/gnrc_networking/Makefile
+++ b/examples/gnrc_networking/Makefile
@@ -12,7 +12,7 @@ BOARD_INSUFFICIENT_MEMORY := airfy-beacon chronos msb-430 msb-430h nrf51dongle \
                           stm32f0discovery telosb wsn430-v1_3b wsn430-v1_4 \
                           yunjia-nrf51822 z1
 
-BOARD_BLACKLIST        := arduino-mega2560 spark-core
+BOARD_BLACKLIST        := spark-core
 # arduino-mega2560: unknown error types (e.g. -EBADMSG)
 
 # Include packages that pull up and auto-init the link layer.