--- zzzz-none-000/linux-4.4.271/drivers/mtd/mtdcore.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/mtd/mtdcore.c	2023-04-19 10:22:29.000000000 +0000
@@ -39,6 +39,7 @@
 #include <linux/slab.h>
 #include <linux/reboot.h>
 #include <linux/kconfig.h>
+#include <linux/root_dev.h>
 
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
@@ -464,6 +465,15 @@
 	   of this try_ nonsense, and no bitching about it
 	   either. :) */
 	__module_get(THIS_MODULE);
+
+	if (!strcmp(mtd->name, "rootfs") &&
+	    config_enabled(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
+	    ROOT_DEV == 0) {
+		pr_notice("mtd: device %d (%s) set to be root filesystem\n",
+			  mtd->index, mtd->name);
+		ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
+	}
+
 	return 0;
 
 fail_added:
@@ -1278,6 +1288,42 @@
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };
+
+#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 */
 
 /*====================================================================*/
@@ -1313,6 +1359,10 @@
 
 	proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops);
 
+#if defined(CONFIG_AVM_ENHANCED)
+	proc_bbt_mtd = proc_create("avm/mtd_bbt", 0, NULL, &mtd_bbt_proc_ops);
+#endif
+
 	ret = init_mtdchar();
 	if (ret)
 		goto out_procfs;
@@ -1322,6 +1372,12 @@
 out_procfs:
 	if (proc_mtd)
 		remove_proc_entry("mtd", NULL);
+
+#if defined(CONFIG_AVM_ENHANCED)
+	if (proc_bbt_mtd)
+		remove_proc_entry("mtd_bbt", NULL);
+#endif
+
 err_bdi:
 	class_unregister(&mtd_class);
 err_reg:
@@ -1334,6 +1390,12 @@
 	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);
 	idr_destroy(&mtd_idr);