scripts: support Sercomm load tags

Header consists in Sercomm PID bytes, followed by a SHA256 hash of the
input binary.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

scripts/sercomm-payload.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+import argparse
+import hashlib
+import os
+
+def create_output(args):
+	in_st = os.stat(args.input_file)
+	in_size = in_st.st_size
+
+	in_f = open(args.input_file, 'r+b')
+	in_bytes = in_f.read(in_size)
+	in_f.close()
+
+	sha256 = hashlib.sha256()
+	sha256.update(in_bytes)
+
+	out_f = open(args.output_file, 'w+b')
+	out_f.write(bytes.fromhex(args.pid))
+	out_f.write(sha256.digest())
+	out_f.write(in_bytes)
+	out_f.close()
+
+def main():
+	global args
+
+	parser = argparse.ArgumentParser(description='')
+
+	parser.add_argument('--input-file',
+		dest='input_file',
+		action='store',
+		type=str,
+		help='Input file')
+
+	parser.add_argument('--output-file',
+		dest='output_file',
+		action='store',
+		type=str,
+		help='Output file')
+
+	parser.add_argument('--pid',
+		dest='pid',
+		action='store',
+		type=str,
+		help='Sercomm PID')
+
+	args = parser.parse_args()
+
+	if ((not args.input_file) or
+	    (not args.output_file) or
+	    (not args.pid)):
+		parser.print_help()
+
+	create_output(args)
+
+main()