Add some simple scripts for signing/flashing
These are some simple scripts for signing images (with an example with a
hardcoded path), a fixed root key that matches the one checked into the
code, and a few scripts to use the Segger debugger to flash the images.
diff --git a/scripts/jgdb.sh b/scripts/jgdb.sh
new file mode 100755
index 0000000..a79c87c
--- /dev/null
+++ b/scripts/jgdb.sh
@@ -0,0 +1,6 @@
+#! /bin/bash
+
+source $(dirname $0)/../target.sh
+
+# Start the jlink gdb server
+JLinkGDBServer -if swd -device $SOC -speed auto