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- From 8a52e4100d7c3a4a1dfddfa02b8864a9b0068c13 Mon Sep 17 00:00:00 2001
- From: Daniel Golle <daniel@makrotopia.org>
- Date: Sat, 17 May 2014 03:36:18 +0200
- Subject: [PATCH 1/5] ubi: auto-attach mtd device named "ubi" or "data" on boot
- To: librecmc-devel@lists.openwrt.org
- Signed-off-by: Daniel Golle <daniel@makrotopia.org>
- ---
- drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++
- 1 file changed, 36 insertions(+)
- --- a/drivers/mtd/ubi/build.c
- +++ b/drivers/mtd/ubi/build.c
- @@ -1209,6 +1209,48 @@ static struct mtd_info * __init open_mtd
- return mtd;
- }
-
- +/*
- + * This function tries attaching mtd partitions named either "ubi" or "data"
- + * during boot.
- + */
- +static void __init ubi_auto_attach(void)
- +{
- + int err;
- + struct mtd_info *mtd;
- +
- + /* try attaching mtd device named "ubi" or "data" */
- + mtd = open_mtd_device("ubi");
- + if (IS_ERR(mtd))
- + mtd = open_mtd_device("data");
- +
- + if (!IS_ERR(mtd)) {
- + size_t len;
- + char magic[4];
- +
- + /* check for a valid ubi magic */
- + err = mtd_read(mtd, 0, 4, &len, (void *) magic);
- + if (!err && len == 4 && strncmp(magic, "UBI#", 4)) {
- + ubi_err("no valid UBI magic found inside mtd%d", mtd->index);
- + put_mtd_device(mtd);
- + return;
- + }
- +
- + /* auto-add only media types where UBI makes sense */
- + if (mtd->type == MTD_NANDFLASH ||
- + mtd->type == MTD_DATAFLASH ||
- + mtd->type == MTD_MLCNANDFLASH) {
- + mutex_lock(&ubi_devices_mutex);
- + ubi_msg("auto-attach mtd%d", mtd->index);
- + err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0);
- + mutex_unlock(&ubi_devices_mutex);
- + if (err < 0) {
- + ubi_err("cannot attach mtd%d", mtd->index);
- + put_mtd_device(mtd);
- + }
- + }
- + }
- +}
- +
- static int __init ubi_init(void)
- {
- int err, i, k;
- @@ -1298,6 +1340,12 @@ static int __init ubi_init(void)
- }
- }
-
- + /* auto-attach mtd devices only if built-in to the kernel and no ubi.mtd
- + * parameter was given */
- + if (config_enabled(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
- + !ubi_is_module() && !mtd_devs)
- + ubi_auto_attach();
- +
- err = ubiblock_init();
- if (err) {
- ubi_err("block: cannot initialize, error %d", err);
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