1 From: Daniel Golle <daniel@makrotopia.org>
2 Subject: ubi: auto-attach mtd device named "ubi" or "data" on boot
4 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
6 drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++
7 1 file changed, 36 insertions(+)
9 --- a/drivers/mtd/ubi/build.c
10 +++ b/drivers/mtd/ubi/build.c
11 @@ -1264,6 +1264,74 @@ static struct mtd_notifier ubi_mtd_notif
12 .remove = ubi_notify_remove,
17 + * This function tries attaching mtd partitions named either "ubi" or "data"
20 +static void __init ubi_auto_attach(void)
23 + struct mtd_info *mtd;
28 + /* try attaching mtd device named "ubi" or "data" */
29 + mtd = open_mtd_device("ubi");
31 + mtd = open_mtd_device("data");
36 + /* get the first not bad block */
37 + if (mtd_can_have_bb(mtd))
38 + while (mtd_block_isbad(mtd, offset)) {
39 + offset += mtd->erasesize;
41 + if (offset > mtd->size) {
42 + pr_err("UBI error: Failed to find a non-bad "
43 + "block on mtd%d\n", mtd->index);
48 + /* check if the read from flash was successful */
49 + err = mtd_read(mtd, offset, 4, &len, (void *) magic);
50 + if ((err && !mtd_is_bitflip(err)) || len != 4) {
51 + pr_err("UBI error: unable to read from mtd%d\n", mtd->index);
55 + /* check for a valid ubi magic */
56 + if (strncmp(magic, "UBI#", 4)) {
57 + pr_err("UBI error: no valid UBI magic found inside mtd%d\n", mtd->index);
61 + /* don't auto-add media types where UBI doesn't makes sense */
62 + if (mtd->type != MTD_NANDFLASH &&
63 + mtd->type != MTD_NORFLASH &&
64 + mtd->type != MTD_DATAFLASH &&
65 + mtd->type != MTD_MLCNANDFLASH)
68 + mutex_lock(&ubi_devices_mutex);
69 + pr_notice("UBI: auto-attach mtd%d\n", mtd->index);
70 + err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0, false);
71 + mutex_unlock(&ubi_devices_mutex);
73 + pr_err("UBI error: cannot attach mtd%d\n", mtd->index);
80 + put_mtd_device(mtd);
83 static int __init ubi_init_attach(void)
86 @@ -1314,6 +1382,12 @@ static int __init ubi_init_attach(void)
90 + /* auto-attach mtd devices only if built-in to the kernel and no ubi.mtd
91 + * parameter was given */
92 + if (IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
93 + !ubi_is_module() && !mtd_devs)