1 --- a/drivers/mtd/Kconfig
2 +++ b/drivers/mtd/Kconfig
3 @@ -18,6 +18,11 @@ config MTD_ROOTFS_ROOT_DEV
4 bool "Automatically set 'rootfs' partition to be root filesystem"
7 +config MTD_ROOTFS_SPLIT
8 + bool "Automatically split 'rootfs' partition for squashfs"
12 config MTD_SPLIT_FIRMWARE
13 bool "Automatically split firmware partition for kernel+rootfs"
15 --- a/drivers/mtd/mtdpart.c
16 +++ b/drivers/mtd/mtdpart.c
17 @@ -682,6 +682,47 @@ mtd_pad_erasesize(struct mtd_info *mtd,
21 +static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
23 + size_t squashfs_len;
26 + ret = mtd_get_squashfs_len(master, offset, &squashfs_len);
30 + len = mtd_pad_erasesize(master, offset, squashfs_len);
31 + *split_offset = offset + len;
36 +static void split_rootfs_data(struct mtd_info *master, struct mtd_part *part)
38 + unsigned int split_offset = 0;
39 + unsigned int split_size;
42 + ret = split_squashfs(master, part->offset, &split_offset);
46 + if (split_offset <= 0)
49 + if (config_enabled(CONFIG_MTD_SPLIT_SQUASHFS_ROOT))
50 + pr_err("Dedicated partitioner didn't create \"rootfs_data\" partition, please fill a bug report!\n");
52 + pr_warn("Support for built-in \"rootfs_data\" splitter will be removed, please use CONFIG_MTD_SPLIT_SQUASHFS_ROOT\n");
54 + split_size = part->mtd.size - (split_offset - part->offset);
55 + printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n",
56 + ROOTFS_SPLIT_NAME, split_offset, split_size);
58 + __mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset,
62 #define UBOOT_MAGIC 0x27051956
64 static void split_uimage(struct mtd_info *master, struct mtd_part *part)
65 @@ -744,7 +785,10 @@ static void mtd_partition_split(struct m
68 if (!strcmp(part->mtd.name, "rootfs")) {
69 - run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
70 + int num = run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
72 + if (num <= 0 && config_enabled(CONFIG_MTD_ROOTFS_SPLIT))
73 + split_rootfs_data(master, part);