+From 2a295753a10823a47542c779a25bbb1f52c71281 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Fri, 3 Aug 2012 10:27:13 +0200
+Subject: [PATCH 19/25] owrt mtd split
+
+---
+ .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h | 1 +
+ arch/mips/lantiq/setup.c | 7 +
+ drivers/mtd/Kconfig | 4 +
+ drivers/mtd/mtdpart.c | 173 +++++++++++++++++++-
+ 4 files changed, 184 insertions(+), 1 deletions(-)
+
+diff --git a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
+index 1ec8f2a..1ff93cc 100644
+diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
+index 982a98b..e2f3f3e 100644
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -31,6 +31,10 @@ config MTD_ROOTFS_SPLIT
+ bool "Automatically split 'rootfs' partition for squashfs"
+ default y
+
++config MTD_UIMAGE_SPLIT
++ bool "Automatically split 'linux' partition into 'kernel' and 'rootfs'"
++ default y
++
+ config MTD_REDBOOT_PARTS
+ tristate "RedBoot partition table parsing"
+ ---help---
+diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
+index 855b70b..93711e2 100644
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -867,6 +867,168 @@ static int refresh_rootfs_split(struct mtd_info *mtd)
+ }
+ #endif /* CONFIG_MTD_ROOTFS_SPLIT */
+
++#ifdef CONFIG_MTD_UIMAGE_SPLIT
++static unsigned long find_uimage_size(struct mtd_info *mtd,
++ unsigned long offset)
++{
++#define UBOOT_MAGIC 0x56190527
++ unsigned long magic = 0;
++ unsigned long temp;
++ size_t len;
++ int ret;
++
++ ret = mtd_read(mtd, offset, 4, &len, (void *)&magic);
++ if (ret || len != sizeof(magic))
++ return 0;
++
++ if (le32_to_cpu(magic) != UBOOT_MAGIC)
++ return 0;
++
++ ret = mtd_read(mtd, offset + 12, 4, &len, (void *)&temp);
++ if (ret || len != sizeof(temp))
++ return 0;
++
++ return temp + 0x40;
++}
++
++static unsigned long find_eva_size(struct mtd_info *mtd,
++ unsigned long offset)
++{
++#define EVA_MAGIC 0xfeed1281
++ unsigned long magic = 0;
++ unsigned long temp;
++ size_t len;
++ int ret;
++
++ ret = mtd_read(mtd, offset, 4, &len, (void *)&magic);
++ if (ret || len != sizeof(magic))
++ return 0;
++
++ if (le32_to_cpu(magic) != EVA_MAGIC)
++ return 0;
++
++ ret = mtd_read(mtd, offset + 4, 4, &len, (void *)&temp);
++ if (ret || len != sizeof(temp))
++ return 0;
++
++ /* add eva header size */
++ temp = le32_to_cpu(temp) + 0x18;
++
++ temp &= ~0xffff;
++ temp += 0x10000;
++ return temp;
++}
++
++static int detect_squashfs_partition(struct mtd_info *mtd, unsigned long offset)
++{
++ unsigned long temp;
++ size_t len;
++ int ret;
++
++ ret = mtd_read(mtd, offset, 4, &len, (void *)&temp);
++ if (ret || len != sizeof(temp))
++ return 0;
++
++
++ return le32_to_cpu(temp) == SQUASHFS_MAGIC;
++}
++
++static int detect_eva_squashfs_partition(struct mtd_info *mtd, unsigned long offset)
++{
++ unsigned long temp;
++ size_t len;
++ int ret;
++
++ ret = mtd_read(mtd, offset, 4, &len, (void *)&temp);
++ if (ret || len != sizeof(temp))
++ return 0;
++
++ return be32_to_cpu(temp) == SQUASHFS_MAGIC;
++}
++
++static unsigned long find_brnimage_size(struct mtd_info *mtd,
++ unsigned long offset)
++{
++ unsigned long buf[4];
++ // Assume at most 2MB of kernel image
++ unsigned long end = offset + (2 << 20);
++ unsigned long ptr = offset + 0x400 - 12;
++ size_t len;
++ int ret;
++
++ while (ptr < end) {
++ long size_min = ptr - 0x400 - 12 - offset;
++ long size_max = ptr + 12 - offset;
++ ret = mtd_read(mtd, ptr, 16, &len, (void *)buf);
++ if (ret || len != 16)
++ return 0;
++
++ if (le32_to_cpu(buf[0]) < size_min ||
++ le32_to_cpu(buf[0]) > size_max) {
++ ptr += 0x400;
++ continue;
++ }
++
++ if (le32_to_cpu(buf[3]) == SQUASHFS_MAGIC)
++ return ptr + 12 - offset;
++
++ ptr += 0x400;
++ }
++
++ return 0;
++}
++
++static int split_uimage(struct mtd_info *mtd,
++ const struct mtd_partition *part)
++{
++ static struct mtd_partition split_partitions[] = {
++ {
++ .name = "kernel",
++ .offset = 0x0,
++ .size = 0x0,
++ }, {
++ .name = "rootfs",
++ .offset = 0x0,
++ .size = 0x0,
++ },
++ };
++
++ split_partitions[0].size = find_uimage_size(mtd, part->offset);
++ if (!split_partitions[0].size) {
++ split_partitions[0].size = find_eva_size(mtd, part->offset);
++ if (!split_partitions[0].size) {
++ split_partitions[0].size = find_brnimage_size(mtd, part->offset);
++ if (!split_partitions[0].size) {
++ printk(KERN_NOTICE "no uImage or brnImage or eva found in linux partition\n");
++ return -1;
++ }
++ }
++ }
++
++ if (detect_eva_squashfs_partition(mtd,
++ part->offset
++ + split_partitions[0].size)) {
++ split_partitions[0].size += 0x100;
++ pr_info("found eva dummy squashfs behind kernel\n");
++ } else if (!detect_squashfs_partition(mtd,
++ part->offset
++ + split_partitions[0].size)) {
++ split_partitions[0].size &= ~(mtd->erasesize - 1);
++ split_partitions[0].size += mtd->erasesize;
++ } else {
++ pr_info("found squashfs behind kernel\n");
++ }
++
++ split_partitions[0].offset = part->offset;
++ split_partitions[1].offset = part->offset + split_partitions[0].size;
++ split_partitions[1].size = part->size - split_partitions[0].size;
++
++ add_mtd_partitions(mtd, split_partitions, 2);
++
++ return 0;
++}
++#endif
++
+ /*
+ * 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
+@@ -883,7 +1045,7 @@ int add_mtd_partitions(struct mtd_info *master,
+ struct mtd_part *slave;
+ uint64_t cur_offset = 0;
+ int i;
+-#ifdef CONFIG_MTD_ROOTFS_SPLIT
++#if defined(CONFIG_MTD_ROOTFS_SPLIT) || defined(CONFIG_MTD_UIMAGE_SPLIT)
+ int ret;
+ #endif
+
+@@ -900,6 +1062,15 @@ int add_mtd_partitions(struct mtd_info *master,
+
+ add_mtd_device(&slave->mtd);
+
++#ifdef CONFIG_MTD_UIMAGE_SPLIT
++ if (!strcmp(parts[i].name, "linux")) {
++ ret = split_uimage(master, &parts[i]);
++
++ if (ret)
++ printk(KERN_WARNING "Can't split linux partition\n");
++ }
++#endif
++
+ if (!strcmp(parts[i].name, "rootfs")) {
+ #ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+ if (ROOT_DEV == 0) {
+--
+1.7.9.1
+
projects / openwrt.git / commitdiff