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-rw-r--r--target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch95
1 files changed, 95 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch b/target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch
new file mode 100644
index 0000000000..59180c2084
--- /dev/null
+++ b/target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch
@@ -0,0 +1,95 @@
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -15,6 +15,8 @@
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
+
++#include <uapi/linux/magic.h>
++
+ /*
+ * NAND flash on Netgear R6250 was verified to contain 15 partitions.
+ * This will result in allocating too big array for some old devices, but the
+@@ -39,7 +41,8 @@
+ #define ML_MAGIC1 0x39685a42
+ #define ML_MAGIC2 0x26594131
+ #define TRX_MAGIC 0x30524448
+-#define SQSH_MAGIC 0x71736873 /* shsq */
++#define SHSQ_MAGIC 0x71736873 /* shsq (weird ZTE H218N endianness) */
++#define UBI_EC_MAGIC 0x23494255 /* UBI# */
+
+ struct trx_header {
+ uint32_t magic;
+@@ -50,7 +53,7 @@ struct trx_header {
+ uint32_t offset[3];
+ } __packed;
+
+-static void bcm47xxpart_add_part(struct mtd_partition *part, char *name,
++static void bcm47xxpart_add_part(struct mtd_partition *part, const char *name,
+ u64 offset, uint32_t mask_flags)
+ {
+ part->name = name;
+@@ -58,6 +61,26 @@ static void bcm47xxpart_add_part(struct
+ part->mask_flags = mask_flags;
+ }
+
++static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
++ size_t offset)
++{
++ uint32_t buf;
++ size_t bytes_read;
++
++ if (mtd_read(master, offset, sizeof(buf), &bytes_read,
++ (uint8_t *)&buf) < 0) {
++ pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
++ offset);
++ goto out_default;
++ }
++
++ if (buf == UBI_EC_MAGIC)
++ return "ubi";
++
++out_default:
++ return "rootfs";
++}
++
+ static int bcm47xxpart_parse(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+@@ -73,8 +96,12 @@ static int bcm47xxpart_parse(struct mtd_
+ int last_trx_part = -1;
+ int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+
+- if (blocksize <= 0x10000)
+- blocksize = 0x10000;
++ /*
++ * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
++ * partitions were aligned to at least 0x1000 anyway.
++ */
++ if (blocksize < 0x1000)
++ blocksize = 0x1000;
+
+ /* Alloc */
+ parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
+@@ -186,8 +213,11 @@ static int bcm47xxpart_parse(struct mtd_
+ * we want to have jffs2 (overlay) in the same mtd.
+ */
+ if (trx->offset[i]) {
++ const char *name;
++
++ name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
+ bcm47xxpart_add_part(&parts[curr_part++],
+- "rootfs",
++ name,
+ offset + trx->offset[i],
+ 0);
+ i++;
+@@ -205,7 +235,8 @@ static int bcm47xxpart_parse(struct mtd_
+ }
+
+ /* Squashfs on devices not using TRX */
+- if (buf[0x000 / 4] == SQSH_MAGIC) {
++ if (le32_to_cpu(buf[0x000 / 4]) == SQUASHFS_MAGIC ||
++ buf[0x000 / 4] == SHSQ_MAGIC) {
+ bcm47xxpart_add_part(&parts[curr_part++], "rootfs",
+ offset, 0);
+ continue;