--- zzzz-none-000/linux-4.1.52/drivers/mtd/mtdcore.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/drivers/mtd/mtdcore.c	2022-03-02 11:37:13.000000000 +0000
@@ -1235,6 +1235,43 @@
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };
+
+/*====================================================================*/
+/* Support for /proc/mtd */
+#if defined(CONFIG_AVM_ENHANCED)
+static struct proc_dir_entry *proc_bbt_mtd;
+static int mtd_bbt_proc_show(struct seq_file *m, void *v)
+{
+	struct mtd_info *mtd;
+
+	mutex_lock(&mtd_table_mutex);
+	mtd_for_each_device(mtd) {
+		if (mtd->_block_isbad) {
+			uint64_t i;
+			unsigned int badblocks = 0;
+			for (i = 0; i < mtd->size; i += mtd->erasesize) {
+				if (mtd->_block_isbad(mtd, i) && ((badblocks + 1) > badblocks))
+					badblocks++;
+			}
+			seq_printf(m, "mtd%d: %u bad blocks\n", mtd->index, badblocks);
+		}
+	}
+	mutex_unlock(&mtd_table_mutex);
+	return 0;
+}
+
+static int mtd_bbt_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mtd_bbt_proc_show, NULL);
+}
+
+static const struct file_operations mtd_bbt_proc_ops = {
+	.open		= mtd_bbt_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+#endif /*--- #if #defined(CONFIG_AVM_ENHANCED) ---*/
 #endif /* CONFIG_PROC_FS */
 
 /*====================================================================*/
@@ -1274,6 +1311,10 @@
 	if (ret)
 		goto out_procfs;
 
+#if defined(CONFIG_AVM_ENHANCED)
+	proc_bbt_mtd = proc_create("avm/mtd_bbt", 0, NULL, &mtd_bbt_proc_ops);
+#endif
+
 	return 0;
 
 out_procfs:
@@ -1291,6 +1332,11 @@
 	cleanup_mtdchar();
 	if (proc_mtd)
 		remove_proc_entry("mtd", NULL);
+
+#if defined(CONFIG_AVM_ENHANCED)
+	if (proc_bbt_mtd)
+		remove_proc_entry("mtd_bbt", NULL);
+#endif
 	class_unregister(&mtd_class);
 	bdi_destroy(&mtd_bdi);
 }