151 lines
4 KiB
Diff
151 lines
4 KiB
Diff
From 2a295753a10823a47542c779a25bbb1f52c71281 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Fri, 3 Aug 2012 10:27:13 +0200
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Subject: [PATCH 19/25] owrt mtd split
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---
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.../mips/include/asm/mach-lantiq/xway/lantiq_soc.h | 1 +
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arch/mips/lantiq/setup.c | 7 +
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drivers/mtd/Kconfig | 4 +
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drivers/mtd/mtdpart.c | 173 +++++++++++++++++++-
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4 files changed, 184 insertions(+), 1 deletions(-)
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -31,6 +31,10 @@ config MTD_ROOTFS_SPLIT
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bool "Automatically split 'rootfs' partition for squashfs"
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default y
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+config MTD_UIMAGE_SPLIT
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+ bool "Automatically split 'linux' partition into 'kernel' and 'rootfs'"
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+ default y
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+
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config MTD_REDBOOT_PARTS
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tristate "RedBoot partition table parsing"
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---help---
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -833,6 +833,99 @@ static int refresh_rootfs_split(struct m
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}
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#endif /* CONFIG_MTD_ROOTFS_SPLIT */
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+#ifdef CONFIG_MTD_UIMAGE_SPLIT
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+static unsigned long find_uimage_size(struct mtd_info *mtd,
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+ unsigned long offset)
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+{
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+#define UBOOT_MAGIC 0x56190527
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+ unsigned long magic = 0;
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+ unsigned long temp;
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+ size_t len;
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+ int ret;
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+
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+ ret = mtd_read(mtd, offset, 4, &len, (void *)&magic);
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+ if (ret || len != sizeof(magic))
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+ return 0;
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+
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+ if (le32_to_cpu(magic) != UBOOT_MAGIC)
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+ return 0;
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+
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+ ret = mtd_read(mtd, offset + 12, 4, &len, (void *)&temp);
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+ if (ret || len != sizeof(temp))
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+ return 0;
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+
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+ return be32_to_cpu(temp) + 0x40;
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+}
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+
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+static int detect_squashfs_partition(struct mtd_info *mtd, unsigned long offset)
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+{
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+ unsigned long temp;
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+ size_t len;
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+ int ret;
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+
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+ ret = mtd_read(mtd, offset, 4, &len, (void *)&temp);
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+ if (ret || len != sizeof(temp))
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+ return 0;
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+
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+ return le32_to_cpu(temp) == SQUASHFS_MAGIC;
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+}
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+
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+static unsigned long find_squashfs_offset(struct mtd_info *mtd, unsigned long _offset)
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+{
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+ /* scan the first 2MB at 64K offsets */
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+ int i;
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+
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+ for (i = 0; i < 32; i++) {
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+ unsigned long offset = i * 64 * 1024;
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+ if (detect_squashfs_partition(mtd, _offset + offset))
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+ return offset;
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+ }
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+ return 0;
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+}
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+
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+static int split_uimage(struct mtd_info *mtd,
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+ const struct mtd_partition *part)
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+{
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+ static struct mtd_partition split_partitions[] = {
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+ {
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+ .name = "kernel",
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+ .offset = 0x0,
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+ .size = 0x0,
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+ }, {
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+ .name = "rootfs",
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+ .offset = 0x0,
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+ .size = 0x0,
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+ },
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+ };
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+
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+ split_partitions[0].size = find_uimage_size(mtd, part->offset);
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+ if (!split_partitions[0].size) {
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+ split_partitions[0].size = find_squashfs_offset(mtd, part->offset);
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+ if (!split_partitions[0].size) {
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+ pr_err("failed to split firmware partition\n");
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+ return -1;
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+ }
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+ }
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+
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+ if (!detect_squashfs_partition(mtd,
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+ part->offset
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+ + split_partitions[0].size)) {
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+ split_partitions[0].size &= ~(mtd->erasesize - 1);
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+ split_partitions[0].size += mtd->erasesize;
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+ } else {
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+ pr_info("found squashfs behind kernel\n");
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+ }
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+
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+ split_partitions[0].offset = part->offset;
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+ split_partitions[1].offset = part->offset + split_partitions[0].size;
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+ split_partitions[1].size = part->size - split_partitions[0].size;
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+
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+ add_mtd_partitions(mtd, split_partitions, 2);
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+
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+ return 0;
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+}
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+#endif
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+
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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@@ -849,7 +942,7 @@ int add_mtd_partitions(struct mtd_info *
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struct mtd_part *slave;
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uint64_t cur_offset = 0;
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int i;
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-#ifdef CONFIG_MTD_ROOTFS_SPLIT
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+#if defined(CONFIG_MTD_ROOTFS_SPLIT) || defined(CONFIG_MTD_UIMAGE_SPLIT)
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int ret;
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#endif
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@@ -866,6 +959,14 @@ int add_mtd_partitions(struct mtd_info *
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add_mtd_device(&slave->mtd);
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+#ifdef CONFIG_MTD_UIMAGE_SPLIT
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+ if (!strcmp(parts[i].name, "firmware")) {
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+ ret = split_uimage(master, &parts[i]);
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+ if (ret)
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+ printk(KERN_WARNING "Can't split firmware partition\n");
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+ }
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+#endif
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+
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if (!strcmp(parts[i].name, "rootfs")) {
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#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
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if (ROOT_DEV == 0) {
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