diff options
Diffstat (limited to 'target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch')
| -rw-r--r-- | target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch new file mode 100644 index 0000000000..f0c852a695 --- /dev/null +++ b/target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch @@ -0,0 +1,123 @@ +From: Felix Fietkau <nbd@nbd.name> +Subject: make rootfs split/detection more generic - patch can be moved to generic-2.6 after testing on other platforms + +lede-commit: 328e660b31f0937d52c5ae3d6e7029409918a9df +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + drivers/mtd/Kconfig | 17 +++++++++++++++++ + drivers/mtd/mtdpart.c | 35 +++++++++++++++++++++++++++++++++++ + include/linux/mtd/partitions.h | 2 ++ + 3 files changed, 54 insertions(+) + +--- 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 +@@ -29,10 +29,12 @@ + #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 "mtdcore.h" ++#include "mtdsplit/mtdsplit.h" + + /* Our partition linked list */ + static LIST_HEAD(mtd_partitions); +@@ -52,6 +54,8 @@ 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. +@@ -686,6 +690,7 @@ int mtd_add_partition(struct mtd_info *p + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(&new->mtd); ++ mtd_partition_split(parent, new); + + mtd_add_partition_attrs(new); + +@@ -764,6 +769,35 @@ 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) && ++ IS_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 +@@ -795,6 +829,7 @@ 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); + if (parts[i].types) + mtd_parse_part(slave, parts[i].types); +--- a/include/linux/mtd/partitions.h ++++ b/include/linux/mtd/partitions.h +@@ -109,5 +109,7 @@ 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 |