--- mtd-utils-2.1.5/nand-utils/Makemodule.am	2021-01-20 12:00:40.000000000 +0100
+++ src/nand-utils/Makemodule.am	2024-10-22 14:35:55.120463004 +0200
@@ -7,6 +7,9 @@
 nandtest_SOURCES = nand-utils/nandtest.c
 nandtest_LDADD = libmtd.a
 
+nandmarkbad_SOURCES = nand-utils/nandmarkbad.c
+nandmarkbad_LDADD = libmtd.a
+
 nftldump_SOURCES = nand-utils/nftldump.c include/mtd_swab.h
 nftldump_SOURCES += include/mtd/nftl-user.h include/mtd/ftl-user.h
 nftldump_LDADD = libmtd.a
@@ -23,7 +26,7 @@
 
 EXTRA_DIST += $(NAND_SH)
 
-sbin_PROGRAMS += nanddump nandwrite nandtest nftldump nftl_format nandflipbits
+sbin_PROGRAMS += nanddump nandwrite nandtest nftldump nftl_format nandflipbits nandmarkbad
 
 if BUILD_TESTS
 test_SCRIPTS += $(NAND_SH)
--- mtd-utils-2.1.5/nand-utils/nandmarkbad.c	1970-01-01 01:00:00.000000000 +0100
+++ src/nand-utils/nandmarkbad.c	2024-10-22 14:33:40.715376194 +0200
@@ -0,0 +1,119 @@
+#define PROGRAM_NAME "nandmarkbad"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include "common.h"
+#include <libmtd.h>
+
+static void usage(int status)
+{
+	fprintf(status ? stderr : stdout,
+		"usage: %s [OPTIONS] <device>\n\n"
+		"  -b, --markbad=blockno        Mark block bad\n"
+		"  -h, --help                   Display this help and exit\n"
+		"  -V, --version                Output version information and exit\n"
+		"  -y, --i-know-what-i-do       really do mark blocks as bad\n",
+		PROGRAM_NAME);
+	exit(status);
+}
+
+/*
+ * Main program
+ */
+int main(int argc, char **argv)
+{
+	loff_t mark_bad[32];
+	unsigned cnt_bad = 0;
+	struct mtd_dev_info mtd;
+	libmtd_t mtd_desc;
+	int fd;
+	int error = 0;
+	int ret;
+	unsigned int i;
+	int iknowwhatido = 0;
+
+	for (;;) {
+		static const char short_options[] = "b:hVy";
+		static const struct option long_options[] = {
+			{ "help", no_argument, 0, 'h' },
+			{ "markbad", required_argument, 0, 'b' },
+			{ "version", no_argument, 0, 'V'},
+			{ "i-know-what-i-do", no_argument, 0, 'y' },
+			{0, 0, 0, 0},
+		};
+		int option_index = 0;
+		int c = getopt_long(argc, argv, short_options, long_options,
+				    &option_index);
+		if (c == EOF)
+			break;
+
+		switch (c) {
+		case '?':
+			usage(EXIT_FAILURE);
+			break;
+
+		case 'b':
+			if (cnt_bad < ARRAY_SIZE(mark_bad)) {
+				mark_bad[cnt_bad] =
+					simple_strtoll(optarg, &error);
+				++cnt_bad;
+			} else {
+				errmsg_die("Can't handle so many bad blocks\n");
+			}
+
+			break;
+
+		case 'h':
+			usage(EXIT_SUCCESS);
+			break;
+
+		case 'V':
+			common_print_version();
+			return EXIT_SUCCESS;
+
+		case 'y':
+			iknowwhatido = 1;
+			break;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (error)
+		usage(EXIT_FAILURE);
+
+	if (argc != 1)
+		errmsg_die("You must specify a device to operate on\n");
+
+	if (!cnt_bad)
+		errmsg_die("You must specify at least one block to mark bad\n");
+
+	if (!iknowwhatido)
+		errmsg_die(PROGRAM_NAME " does things that are hard to undo.\n"
+			   "\tPlease convince yourself you understand the risks,\n"
+			   "\tthen add --i-know-what-i-do to the options.\n");
+
+	fd = open(argv[0], O_RDWR);
+	if (fd < 0)
+		sys_errmsg_die("Failed to open mtd device\n");
+
+	mtd_desc = libmtd_open();
+	if (!mtd_desc)
+		errmsg_die("Can't initialize libmtd");
+
+	if (mtd_get_dev_info(mtd_desc, argv[0], &mtd) < 0)
+		errmsg_die("mtd_get_dev_info failed");
+
+	for (i = 0; i < cnt_bad; ++i) {
+		ret = mtd_mark_bad(&mtd, fd, mark_bad[i]);
+		if (ret)
+			sys_errmsg_die("%s: MTD Mark bad block failure",
+				       argv[0]);
+	}
+
+	return EXIT_SUCCESS;
+}