--- fwmaker/src/fwmaker.c	2026/01/04 18:08:18	1.1.1.1
+++ fwmaker/src/fwmaker.c	2026/01/04 18:59:16	1.3
@@ -1,3 +1,48 @@
+/*************************************************************************
+* (C) 2025 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
+*  by Michael Pounov <misho@elwix.org>
+*
+* $Author: misho $
+* $Id: fwmaker.c,v 1.3 2026/01/04 18:59:16 misho Exp $
+*
+**************************************************************************
+The ELWIX and AITNET software is distributed under the following
+terms:
+
+All of the documentation and software included in the ELWIX and AITNET
+Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
+
+Copyright 2004 - 2025
+	by Michael Pounov <misho@elwix.org>.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. All advertising materials mentioning features or use of this software
+   must display the following acknowledgement:
+This product includes software developed by Michael Pounov <misho@elwix.org>
+ELWIX - Embedded LightWeight unIX and its contributors.
+4. Neither the name of AITNET nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
+*/
 #include "global.h"
 #include "cmds.h"
 #include "image.h"
@@ -8,6 +53,7 @@ struct tagMtd mtd;
 char image[MAXPATHLEN];
 int imgfd;
 size_t imgsiz;
+u_char fillCh = 0x0;
 
 
 void
@@ -16,8 +62,9 @@ Usage()
 	printf(	" -= FWMAKER =- Firmware maker software ver.%s\n"
 		" (C)`25 ELWIX by Michael Pounov <misho@elwix.org> \n"
 		"==================================================\n"
-		" Syntax: fwmaker [-options] <image> [commands]\n\n"
+		" Syntax: fwmaker [-options] <image> [command [args]]\n\n"
 		"\t-i\t\t\tPrompt command\n"
+		"\t-C <byte>\t\tFill empty bytes [default=0x0]\n"
 		"\t-d <0xmask>\t\tDebug mode\n"
 		"\t-v\t\t\tVerbose, more -v more verbosity\n"
 		"\t-h\t\t\tHelp, this screen\n", "0.1");
@@ -29,6 +76,9 @@ prepareCli()
 	cli_addCommand(line, "image", 1, cmd_Image, "image command", "image management");
 	cli_addCommand(line, "mtd", 1, cmd_Mtd, "mtd command", "mtd partition");
 	cli_addCommand(line, "show", 1, cmd_Show, "show command", "shows parameters");
+
+	cli_addCommand(line, "fill_byte", 2, cmd_FillCh, "fill_byte command",
+			"fill image empty areas with byte");
 }
 
 int
@@ -37,8 +87,11 @@ main(int argc, char **argv)
 	int ch, imode = 0, ret = 0;
 	char **args, cmdline[BUFSIZ] = { 0 };
 
-	while ((ch = getopt(argc, argv, "hvid:")) != -1)
+	while ((ch = getopt(argc, argv, "hvid:C:")) != -1)
 		switch (ch) {
+			case 'C':
+				fillCh = (u_char) strtol(optarg, NULL, 0);
+				break;
 			case 'i':
 				imode = 42;
 				break;