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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
@@ -844,6 +844,168 @@ 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 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
@@ -860,7 +1022,7 @@ 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
@@ -877,6 +1039,15 @@ int add_mtd_partitions(struct mtd_info *
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) {
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