--- /dev/null
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -23,6 +23,14 @@ config MTD_TESTS
+ WARNING: some of the tests will ERASE entire MTD device which they
+ test. Do not use these tests unless you really know what you do.
+
++config MTD_ROOTFS_ROOT_DEV
++ bool "Automatically set 'rootfs' partition to be root filesystem"
++ default y
++
++config MTD_ROOTFS_SPLIT
++ bool "Automatically split 'rootfs' partition for squashfs"
++ default y
++
+ config MTD_REDBOOT_PARTS
+ tristate "RedBoot partition table parsing"
+ ---help---
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -29,6 +29,8 @@
+ #include <linux/kmod.h>
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
++#include <linux/root_dev.h>
++#include <linux/magic.h>
+ #include <linux/err.h>
+
+ #include "mtdcore.h"
+@@ -50,7 +52,7 @@ struct mtd_part {
+ * the pointer to that structure with this macro.
+ */
+ #define PART(x) ((struct mtd_part *)(x))
+-
++#define IS_PART(mtd) (mtd->_read == part_read)
+
+ /*
+ * MTD methods which simply translate the effective address and pass through
+@@ -613,6 +615,144 @@ int mtd_del_partition(struct mtd_info *m
+ }
+ EXPORT_SYMBOL_GPL(mtd_del_partition);
+
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++#define ROOTFS_SPLIT_NAME "rootfs_data"
++#define ROOTFS_REMOVED_NAME "<removed>"
++
++struct squashfs_super_block {
++ __le32 s_magic;
++ __le32 pad0[9];
++ __le64 bytes_used;
++};
++
++
++static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
++{
++ struct squashfs_super_block sb;
++ int len, ret;
++
++ ret = mtd_read(master, offset, sizeof(sb), &len, (void *) &sb);
++ if (ret || (len != sizeof(sb))) {
++ printk(KERN_ALERT "split_squashfs: error occured while reading "
++ "from \"%s\"\n", master->name);
++ return -EINVAL;
++ }
++
++ if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
++ printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
++ master->name);
++ *split_offset = 0;
++ return 0;
++ }
++
++ if (le64_to_cpu((sb.bytes_used)) <= 0) {
++ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
++ master->name);
++ *split_offset = 0;
++ return 0;
++ }
++
++ len = (u32) le64_to_cpu(sb.bytes_used);
++ len += (offset & 0x000fffff);
++ len += (master->erasesize - 1);
++ len &= ~(master->erasesize - 1);
++ len -= (offset & 0x000fffff);
++ *split_offset = offset + len;
++
++ return 0;
++}
++
++static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
++{
++ struct mtd_partition dpart;
++ struct mtd_part *slave = NULL;
++ struct mtd_part *spart;
++ int ret, split_offset = 0;
++
++ spart = PART(rpart);
++ ret = split_squashfs(master, spart->offset, &split_offset);
++ if (ret)
++ return ret;
++
++ if (split_offset <= 0)
++ return 0;
++
++ memcpy(&dpart, part, sizeof(dpart));
++ dpart.name = ROOTFS_SPLIT_NAME;
++
++ dpart.size = rpart->size - (split_offset - spart->offset);
++ dpart.offset = split_offset;
++
++ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
++ ROOTFS_SPLIT_NAME, dpart.offset, dpart.size);
++
++ slave = allocate_partition(master, &dpart, 0, split_offset);
++ if (IS_ERR(slave))
++ return PTR_ERR(slave);
++ mutex_lock(&mtd_partitions_mutex);
++ list_add(&slave->list, &mtd_partitions);
++ mutex_unlock(&mtd_partitions_mutex);
++
++ add_mtd_device(&slave->mtd);
++
++ rpart->split = &slave->mtd;
++
++ return 0;
++}
++
++static int refresh_rootfs_split(struct mtd_info *mtd)
++{
++ struct mtd_partition tpart;
++ struct mtd_part *part;
++ char *name;
++ //int index = 0;
++ int offset, size;
++ int ret;
++
++ part = PART(mtd);
++
++ /* check for the new squashfs offset first */
++ ret = split_squashfs(part->master, part->offset, &offset);
++ if (ret)
++ return ret;
++
++ if ((offset > 0) && !mtd->split) {
++ printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
++ /* if we don't have a rootfs split partition, create a new one */
++ tpart.name = (char *) mtd->name;
++ tpart.size = mtd->size;
++ tpart.offset = part->offset;
++
++ return split_rootfs_data(part->master, &part->mtd, &tpart);
++ } else if ((offset > 0) && mtd->split) {
++ /* update the offsets of the existing partition */
++ size = mtd->size + part->offset - offset;
++
++ part = PART(mtd->split);
++ part->offset = offset;
++ part->mtd.size = size;
++ printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
++ __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
++ (u32) part->offset, (u32) part->mtd.size);
++ name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
++ strcpy(name, ROOTFS_SPLIT_NAME);
++ part->mtd.name = name;
++ } else if ((offset <= 0) && mtd->split) {
++ printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
++
++ /* mark existing partition as removed */
++ part = PART(mtd->split);
++ name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
++ strcpy(name, ROOTFS_REMOVED_NAME);
++ part->mtd.name = name;
++ part->offset = 0;
++ part->mtd.size = 0;
++ }
++
++ return 0;
++}
++#endif /* CONFIG_MTD_ROOTFS_SPLIT */
++
+ /*
+ * This function, given a master MTD object and a partition table, creates
+ * and registers slave MTD objects which are bound to the master according to
+@@ -629,6 +769,9 @@ int add_mtd_partitions(struct mtd_info *
+ struct mtd_part *slave;
+ uint64_t cur_offset = 0;
+ int i;
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++ int ret;
++#endif
+
+ printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
+
+@@ -643,12 +786,53 @@ int add_mtd_partitions(struct mtd_info *
+
+ add_mtd_device(&slave->mtd);
+
++ if (!strcmp(parts[i].name, "rootfs")) {
++#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
++ if (ROOT_DEV == 0) {
++ printk(KERN_NOTICE "mtd: partition \"rootfs\" "
++ "set to be root filesystem\n");
++ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
++ }
++#endif
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++ ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
++ /* if (ret == 0)
++ * j++; */
++#endif
++ }
++
+ cur_offset = slave->offset + slave->mtd.size;
+ }
+
+ return 0;
+ }
+
++int mtd_device_refresh(struct mtd_info *mtd)
++{
++ int ret = 0;
++
++ if (IS_PART(mtd)) {
++ struct mtd_part *part;
++ struct mtd_info *master;
++
++ part = PART(mtd);
++ master = part->master;
++ if (master->refresh_device)
++ ret = master->refresh_device(master);
++ }
++
++ if (!ret && mtd->refresh_device)
++ ret = mtd->refresh_device(mtd);
++
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++ if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
++ refresh_rootfs_split(mtd);
++#endif
++
++ return 0;
++}
++EXPORT_SYMBOL_GPL(mtd_device_refresh);
++
+ static DEFINE_SPINLOCK(part_parser_lock);
+ static LIST_HEAD(part_parsers);
+
+--- a/drivers/mtd/mtdchar.c
++++ b/drivers/mtd/mtdchar.c
+@@ -1010,6 +1010,12 @@ static int mtdchar_ioctl(struct file *fi
+ break;
+ }
+
++ case MTDREFRESH:
++ {
++ ret = mtd_device_refresh(mtd);
++ break;
++ }
++
+ default:
+ ret = -ENOTTY;
+ }
+--- a/include/linux/mtd/mtd.h
++++ b/include/linux/mtd/mtd.h
+@@ -114,6 +114,7 @@ struct nand_ecclayout {
+
+ struct module; /* only needed for owner field in mtd_info */
+
++struct mtd_info;
+ struct mtd_info {
+ u_char type;
+ uint32_t flags;
+@@ -226,6 +227,9 @@ struct mtd_info {
+ int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
+ int (*_suspend) (struct mtd_info *mtd);
+ void (*_resume) (struct mtd_info *mtd);
++ int (*refresh_device)(struct mtd_info *mtd);
++ struct mtd_info *split;
++
+ /*
+ * If the driver is something smart, like UBI, it may need to maintain
+ * its own reference counting. The below functions are only for driver.
+@@ -368,6 +372,7 @@ extern int mtd_device_parse_register(str
+ int defnr_parts);
+ #define mtd_device_register(master, parts, nr_parts) \
+ mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
++extern int mtd_device_refresh(struct mtd_info *master);
+ extern int mtd_device_unregister(struct mtd_info *master);
+ extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
+ extern int __get_mtd_device(struct mtd_info *mtd);
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -36,12 +36,14 @@
+ * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
+ */
+
++struct mtd_partition;
+ struct mtd_partition {
+ char *name; /* identifier string */
+ uint64_t size; /* partition size */
+ uint64_t offset; /* offset within the master MTD space */
+ uint32_t mask_flags; /* master MTD flags to mask out for this partition */
+ struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */
++ int (*refresh_partition)(struct mtd_info *);
+ };
+
+ #define MTDPART_OFS_RETAIN (-3)
+--- a/include/uapi/mtd/mtd-abi.h
++++ b/include/uapi/mtd/mtd-abi.h
+@@ -202,6 +202,7 @@ struct otp_info {
+ * without OOB, e.g., NOR flash.
+ */
+ #define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
++#define MTDREFRESH _IO('M', 50)
+
+ /*
+ * Obsolete legacy interface. Keep it in order not to break userspace
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