| 1 | --- a/drivers/mtd/Kconfig |
| 2 | +++ b/drivers/mtd/Kconfig |
| 3 | @@ -63,6 +63,10 @@ |
| 4 | depends on MTD_PARTITIONS |
| 5 | default y |
| 6 | |
| 7 | +config MTD_UIMAGE_SPLIT |
| 8 | + bool "Automatically split 'linux' partition into 'kernel' and 'rootfs'" |
| 9 | + default y |
| 10 | + |
| 11 | config MTD_REDBOOT_PARTS |
| 12 | tristate "RedBoot partition table parsing" |
| 13 | depends on MTD_PARTITIONS |
| 14 | --- a/drivers/mtd/mtdpart.c |
| 15 | +++ b/drivers/mtd/mtdpart.c |
| 16 | @@ -724,6 +724,82 @@ |
| 17 | } |
| 18 | #endif /* CONFIG_MTD_ROOTFS_SPLIT */ |
| 19 | |
| 20 | + |
| 21 | +#ifdef CONFIG_MTD_UIMAGE_SPLIT |
| 22 | +static unsigned long find_uimage_size(struct mtd_info *mtd, |
| 23 | + unsigned long offset) |
| 24 | +{ |
| 25 | +#define UBOOT_MAGIC 0x56190527 |
| 26 | + unsigned long magic = 0; |
| 27 | + unsigned long temp; |
| 28 | + size_t len; |
| 29 | + int ret; |
| 30 | + |
| 31 | + ret = mtd->read(mtd, offset, 4, &len, (void *)&magic); |
| 32 | + if (ret || len != sizeof(magic)) |
| 33 | + return 0; |
| 34 | + |
| 35 | + if (le32_to_cpu(magic) != UBOOT_MAGIC) |
| 36 | + return 0; |
| 37 | + |
| 38 | + ret = mtd->read(mtd, offset + 12, 4, &len, (void *)&temp); |
| 39 | + if (ret || len != sizeof(temp)) |
| 40 | + return 0; |
| 41 | + |
| 42 | + return temp + 0x40; |
| 43 | +} |
| 44 | + |
| 45 | +static int detect_squashfs_partition(struct mtd_info *mtd, unsigned long offset) |
| 46 | +{ |
| 47 | + unsigned long temp; |
| 48 | + size_t len; |
| 49 | + int ret; |
| 50 | + |
| 51 | + ret = mtd->read(mtd, offset, 4, &len, (void *)&temp); |
| 52 | + if (ret || len != sizeof(temp)) |
| 53 | + return 0; |
| 54 | + |
| 55 | + return le32_to_cpu(temp) == SQUASHFS_MAGIC; |
| 56 | +} |
| 57 | + |
| 58 | +static int split_uimage(struct mtd_info *mtd, |
| 59 | + const struct mtd_partition *part) |
| 60 | +{ |
| 61 | + static struct mtd_partition split_partitions[] = { |
| 62 | + { |
| 63 | + .name = "kernel", |
| 64 | + .offset = 0x0, |
| 65 | + .size = 0x0, |
| 66 | + }, { |
| 67 | + .name = "rootfs", |
| 68 | + .offset = 0x0, |
| 69 | + .size = 0x0, |
| 70 | + }, |
| 71 | + }; |
| 72 | + |
| 73 | + split_partitions[0].size = find_uimage_size(mtd, part->offset); |
| 74 | + if (!split_partitions[0].size) { |
| 75 | + printk(KERN_NOTICE "no uImage found in linux partition\n"); |
| 76 | + return -1; |
| 77 | + } |
| 78 | + |
| 79 | + if (!detect_squashfs_partition(mtd, |
| 80 | + part->offset |
| 81 | + + split_partitions[0].size)) { |
| 82 | + split_partitions[0].size &= ~(mtd->erasesize - 1); |
| 83 | + split_partitions[0].size += mtd->erasesize; |
| 84 | + } |
| 85 | + |
| 86 | + split_partitions[0].offset = part->offset; |
| 87 | + split_partitions[1].offset = part->offset + split_partitions[0].size; |
| 88 | + split_partitions[1].size = part->size - split_partitions[0].size; |
| 89 | + |
| 90 | + add_mtd_partitions(mtd, split_partitions, 2); |
| 91 | + |
| 92 | + return 0; |
| 93 | +} |
| 94 | +#endif |
| 95 | + |
| 96 | /* |
| 97 | * This function, given a master MTD object and a partition table, creates |
| 98 | * and registers slave MTD objects which are bound to the master according to |
| 99 | @@ -748,6 +824,17 @@ |
| 100 | if (!slave) |
| 101 | return -ENOMEM; |
| 102 | |
| 103 | +#ifdef CONFIG_MTD_UIMAGE_SPLIT |
| 104 | + if (!strcmp(parts[i].name, "linux")) { |
| 105 | + ret = split_uimage(master, &parts[i]); |
| 106 | + |
| 107 | + if (ret) { |
| 108 | + printk(KERN_WARNING |
| 109 | + "Can't split linux partition\n"); |
| 110 | + } |
| 111 | + } |
| 112 | +#endif |
| 113 | + |
| 114 | if (!strcmp(parts[i].name, "rootfs")) { |
| 115 | #ifdef CONFIG_MTD_ROOTFS_ROOT_DEV |
| 116 | if (ROOT_DEV == 0) { |
| 117 | |
