kinetis: Add check-fcfield-elf.sh

Checks an ELF file for a correctly set flash configuration field.

cpu/kinetis_common/dist/check-fcfield-elf.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# Anti brick check script for Freescale Kinetis MCUs.
+#
+# This script is supposed to be called from RIOTs
+# unified OpenOCD script (dist/tools/openocd/openocd.sh).
+#
+# @author       Jonas Remmert <j.remmert@phytec.de>
+# @author       Johann Fischer <j.fischer@phytec.de>
+
+ELFFILE=$1
+
+RETVAL=$(arm-none-eabi-readelf -x .fcfield $ELFFILE  | awk '/0x00000400/ {print $2 $3 $4 $5}')
+UNLOCKED_FCFIELD="fffffffffffffffffffffffffeffffff"
+
+if [ "$RETVAL" != "$UNLOCKED_FCFIELD" ]; then
+    echo "Danger of bricking the device during flash!"
+    echo "Flash configuration field of $ELFFILE:"
+    arm-none-eabi-readelf -x .fcfield $ELFFILE
+    echo "Abort flash procedure!"
+    exit 1
+fi
+echo "$ELFFILE is fine."
+exit 0