openwrtv4/target/linux/generic/pending-3.18/405-mtd-old-firmware-uimage-splitter.patch

--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -27,6 +27,11 @@ config MTD_SPLIT_FIRMWARE_NAME
 	depends on MTD_SPLIT_FIRMWARE
 	default "firmware"
 
+config MTD_UIMAGE_SPLIT
+	bool "Enable split support for firmware partitions containing a uImage"
+	depends on MTD_SPLIT_FIRMWARE
+	default y
+
 source "drivers/mtd/mtdsplit/Kconfig"
 
 endmenu
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -682,6 +682,37 @@ mtd_pad_erasesize(struct mtd_info *mtd,
 	return len;
 }
 
+#define UBOOT_MAGIC	0x27051956
+
+static void split_uimage(struct mtd_info *master, struct mtd_part *part)
+{
+	struct {
+		__be32 magic;
+		__be32 pad[2];
+		__be32 size;
+	} hdr;
+	size_t len;
+
+	if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr))
+		return;
+
+	if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC))
+		return;
+
+	len = be32_to_cpu(hdr.size) + 0x40;
+	len = mtd_pad_erasesize(master, part->offset, len);
+	if (len + master->erasesize > part->mtd.size)
+		return;
+
+	if (config_enabled(CONFIG_MTD_SPLIT_UIMAGE_FW))
+		pr_err("Dedicated partitioner didn't split firmware partition, please fill a bug report!\n");
+	else
+		pr_warn("Support for built-in firmware splitter will be removed, please use CONFIG_MTD_SPLIT_UIMAGE_FW\n");
+
+	__mtd_add_partition(master, "rootfs", part->offset + len,
+			    part->mtd.size - len, false);
+}
+
 #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
 #define SPLIT_FIRMWARE_NAME	CONFIG_MTD_SPLIT_FIRMWARE_NAME
 #else
@@ -690,7 +721,14 @@ mtd_pad_erasesize(struct mtd_info *mtd,
 
 static void split_firmware(struct mtd_info *master, struct mtd_part *part)
 {
-	run_parsers_by_type(part, MTD_PARSER_TYPE_FIRMWARE);
+	int ret;
+
+	ret = run_parsers_by_type(part, MTD_PARSER_TYPE_FIRMWARE);
+	if (ret > 0)
+		return;
+
+	if (config_enabled(CONFIG_MTD_UIMAGE_SPLIT))
+		split_uimage(master, part);
 }
 
 void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,