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-rw-r--r--target/linux/generic/patches-4.4/400-mtd-add-rootfs-split-support.patch146
1 files changed, 146 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/patches-4.4/400-mtd-add-rootfs-split-support.patch
new file mode 100644
index 0000000000..74a0ecdcef
--- /dev/null
+++ b/target/linux/generic/patches-4.4/400-mtd-add-rootfs-split-support.patch
@@ -0,0 +1,146 @@
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -12,6 +12,23 @@ menuconfig MTD
+
+ if MTD
+
++menu "OpenWrt specific MTD options"
++
++config MTD_ROOTFS_ROOT_DEV
++ bool "Automatically set 'rootfs' partition to be root filesystem"
++ default y
++
++config MTD_SPLIT_FIRMWARE
++ bool "Automatically split firmware partition for kernel+rootfs"
++ default y
++
++config MTD_SPLIT_FIRMWARE_NAME
++ string "Firmware partition name"
++ depends on MTD_SPLIT_FIRMWARE
++ default "firmware"
++
++endmenu
++
+ config MTD_TESTS
+ tristate "MTD tests support (DANGEROUS)"
+ depends on m
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -29,11 +29,13 @@
+ #include <linux/kmod.h>
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
++#include <linux/magic.h>
+ #include <linux/of.h>
+ #include <linux/err.h>
+ #include <linux/kconfig.h>
+
+ #include "mtdcore.h"
++#include "mtdsplit/mtdsplit.h"
+
+ /* Our partition linked list */
+ static LIST_HEAD(mtd_partitions);
+@@ -47,13 +49,14 @@ struct mtd_part {
+ struct list_head list;
+ };
+
++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
++
+ /*
+ * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
+ * the pointer to that structure with this macro.
+ */
+ #define PART(x) ((struct mtd_part *)(x))
+
+-
+ /*
+ * MTD methods which simply translate the effective address and pass through
+ * to the _real_ device.
+@@ -579,8 +582,10 @@ static int mtd_add_partition_attrs(struc
+ return ret;
+ }
+
+-int mtd_add_partition(struct mtd_info *master, const char *name,
+- long long offset, long long length)
++
++static int
++__mtd_add_partition(struct mtd_info *master, const char *name,
++ long long offset, long long length, bool dup_check)
+ {
+ struct mtd_partition part;
+ struct mtd_part *new;
+@@ -612,6 +617,7 @@ int mtd_add_partition(struct mtd_info *m
+ mutex_unlock(&mtd_partitions_mutex);
+
+ add_mtd_device(&new->mtd);
++ mtd_partition_split(master, new);
+
+ mtd_add_partition_attrs(new);
+
+@@ -619,6 +625,12 @@ int mtd_add_partition(struct mtd_info *m
+ }
+ EXPORT_SYMBOL_GPL(mtd_add_partition);
+
++int mtd_add_partition(struct mtd_info *master, const char *name,
++ long long offset, long long length)
++{
++ return __mtd_add_partition(master, name, offset, length, true);
++}
++
+ int mtd_del_partition(struct mtd_info *master, int partno)
+ {
+ struct mtd_part *slave, *next;
+@@ -644,6 +656,35 @@ int mtd_del_partition(struct mtd_info *m
+ }
+ EXPORT_SYMBOL_GPL(mtd_del_partition);
+
++#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
++#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
++#else
++#define SPLIT_FIRMWARE_NAME "unused"
++#endif
++
++static void split_firmware(struct mtd_info *master, struct mtd_part *part)
++{
++}
++
++void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
++ int offset, int size)
++{
++}
++
++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
++{
++ static int rootfs_found = 0;
++
++ if (rootfs_found)
++ return;
++
++ if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
++ config_enabled(CONFIG_MTD_SPLIT_FIRMWARE))
++ split_firmware(master, part);
++
++ arch_split_mtd_part(master, part->mtd.name, part->offset,
++ part->mtd.size);
++}
+ /*
+ * 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
+@@ -675,6 +716,7 @@ int add_mtd_partitions(struct mtd_info *
+ mutex_unlock(&mtd_partitions_mutex);
+
+ add_mtd_device(&slave->mtd);
++ mtd_partition_split(master, slave);
+ mtd_add_partition_attrs(slave);
+
+ cur_offset = slave->offset + slave->mtd.size;
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -84,5 +84,7 @@ int mtd_add_partition(struct mtd_info *m
+ long long offset, long long length);
+ int mtd_del_partition(struct mtd_info *master, int partno);
+ uint64_t mtd_get_device_size(const struct mtd_info *mtd);
++extern void __weak arch_split_mtd_part(struct mtd_info *master,
++ const char *name, int offset, int size);
+
+ #endif