From 0a866293bd9e204978c995cb0545c20f8ab63c7e Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Mon, 10 Oct 2011 15:13:46 +0000
Subject: * update patches to 3.0 * add basic vr9 support * backport 3.1 fixes
 * backport 3.2 queue (falcon)

SVN-Revision: 28405
---
 .../patches-3.0/201-owrt-mtd_uimage_split.patch    | 116 +++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 target/linux/lantiq/patches-3.0/201-owrt-mtd_uimage_split.patch

(limited to 'target/linux/lantiq/patches-3.0/201-owrt-mtd_uimage_split.patch')

diff --git a/target/linux/lantiq/patches-3.0/201-owrt-mtd_uimage_split.patch b/target/linux/lantiq/patches-3.0/201-owrt-mtd_uimage_split.patch
new file mode 100644
index 0000000000..6c6a45ac04
--- /dev/null
+++ b/target/linux/lantiq/patches-3.0/201-owrt-mtd_uimage_split.patch
@@ -0,0 +1,116 @@
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -41,6 +41,10 @@ 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
+@@ -861,6 +861,82 @@ 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 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 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) {
++		printk(KERN_NOTICE "no uImage found in linux 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;
++	}
++
++	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
+@@ -894,6 +970,17 @@ 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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