$ cat /sys/kernel/debug/ubi/ubi0/detailed_erase_block_info
physical_block_number   erase_count
0                       939        
1                       904        
2                       923        
3                       904        
4                       940        
5                       913        
6                       930        
7                       9          # The erase counter of fm_anchor PEB is smaller than any other PEBs
8                       905        
9                       902        
10                      945        
11                      916        
12                      922        
13                      923        
14                      900        
15                      927

#!/bin/bash
set -e

TMP=/root/temp
umount $TMP 2>/dev/null || true
mkdir -p $TMP

modprobe -r ubifs 2>/dev/null || true
for i in $(seq 0 1)
do
	ubidetach -p /dev/mtd$i 2>/dev/null || true
done
modprobe -r ubi 2>/dev/null || true
modprobe -r nandsim 2>/dev/null || true

mtd=/dev/mtd0
ubi=/dev/ubi0

ID="0xec,0xa1,0x00,0x15" # 128M 128KB 2KB
#ID="0x20,0xa5,0x00,0x15" # 2GB 128KB PEB, 2KB page
#ID="0x20,0xa5,0x00,0x26" # 4G 256KB 4KB 1KB-sub-page
#ID="0x20,0xa7,0x00,0x26" # 4G 256KB 4KB 2KB-sub-page
#ID="0x20,0x33,0x00,0x00" # 16M 16KB PEB, 512 page

modprobe nandsim id_bytes=$ID parts=400

# https://github.com/google/fscryptctl
encryption()
{
	head -c 64 /dev/urandom > /tmp/key
	key=$(/root/fscryptctl/fscryptctl add_key $TMP < /tmp/key)
	/root/fscryptctl/fscryptctl set_policy $key $TMP
	/root/fscryptctl/fscryptctl get_policy $TMP
}

flash_eraseall /dev/mtd0

if [ "$1" == "1" ]
then
	modprobe ubi mtd="0,2048,1" fm_autoconvert
	ubimkvol -N vol_a -m -n 0 /dev/ubi0
	rmmod ubi
	modprobe ubi mtd="0,2048,1" fm_autoconvert
	modprobe ubifs
#	mkfs.ubifs -j 6221824 -R 0 /dev/ubi0_0
	mount -osync -t ubifs /dev/ubi0_0 $TMP
	if [ "$2" == "e" ]
	then
		encryption
	fi
else
	nandwrite /dev/mtd0 disk > /dev/null
	modprobe ubi mtd="0,2048,1" fm_autoconvert
	modprobe ubifs
#	echo 1 > /sys/kernel/debug/ubifs/chk_fs
	mount -t ubifs /dev/ubi0_0 $TMP
fi

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 4153e0d15c5f..e572ff1c6a7b 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -963,7 +963,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 	if (!ubi->fm_buf)
 		goto out_free;
 #endif
-	err = ubi_attach(ubi, 0);
+	ubi->fm_disabled = 1;
+	err = ubi_attach(ubi, 1);
 	if (err) {
 		ubi_err(ubi, "failed to attach mtd%d, error %d",
 			mtd->index, err);
diff --git a/drivers/mtd/ubi/fastmap-wl.c b/drivers/mtd/ubi/fastmap-wl.c
index 053ab52668e8..1784449ef9b0 100644
--- a/drivers/mtd/ubi/fastmap-wl.c
+++ b/drivers/mtd/ubi/fastmap-wl.c
@@ -153,6 +153,7 @@ void ubi_refill_pools(struct ubi_device *ubi)
 	 * the best anchor PEBs.
 	 */
 	ubi->fm_anchor = ubi_wl_get_fm_peb(ubi, 1);
+	printk_ratelimited("anchor %d\n", ubi->fm_anchor->pnum);
 
 	for (;;) {
 		enough = 0;