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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(-)
--- 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---
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -833,6 +833,99 @@ static int refresh_rootfs_split(struct m
}
#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 be32_to_cpu(temp) + 0x40;
+}
+
+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 unsigned long find_squashfs_offset(struct mtd_info *mtd, unsigned long _offset)
+{
+ /* scan the first 2MB at 64K offsets */
+ int i;
+
+ for (i = 0; i < 32; i++) {
+ unsigned long offset = i * 64 * 1024;
+ if (detect_squashfs_partition(mtd, _offset + offset))
+ return offset;
+ }
+ 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_squashfs_offset(mtd, part->offset);
+ if (!split_partitions[0].size) {
+ pr_err("failed to split firmware partition\n");
+ return -1;
+ }
+ }
+
+ 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
@@ -849,7 +942,7 @@ int add_mtd_partitions(struct mtd_info *
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
@@ -866,6 +959,14 @@ int add_mtd_partitions(struct mtd_info *
add_mtd_device(&slave->mtd);
+#ifdef CONFIG_MTD_UIMAGE_SPLIT
+ if (!strcmp(parts[i].name, "firmware")) {
+ ret = split_uimage(master, &parts[i]);
+ if (ret)
+ printk(KERN_WARNING "Can't split firmware partition\n");
+ }
+#endif
+
if (!strcmp(parts[i].name, "rootfs")) {
#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
if (ROOT_DEV == 0) {
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