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kernel: move old firmware uimage splitter into separated patch

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This will allow us to drop it in the future. This patch doesn't change
the final mtdpart.c, it remains the same.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 43696
This commit is contained in:
Rafał Miłecki
2014-12-13 20:06:47 +00:00
parent 0fa857f3ba
commit 2b4fbeb6d4
14 changed files with 202 additions and 134 deletions
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50
target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch
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@@ -1,6 +1,6 @@
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -12,6 +12,28 @@ menuconfig MTD
@@ -12,6 +12,23 @@ menuconfig MTD
if MTD
@@ -19,11 +19,6 @@
+ 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
+
+endmenu
+
config MTD_TESTS
@@ -120,47 +115,10 @@
int mtd_del_partition(struct mtd_info *master, int partno)
{
struct mtd_part *slave, *next;
@@ -627,6 +641,74 @@ int mtd_del_partition(struct mtd_info *m
@@ -627,6 +641,35 @@ int mtd_del_partition(struct mtd_info *m
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
+static inline unsigned long
+mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
+{
+ unsigned long mask = mtd->erasesize - 1;
+
+ len += offset & mask;
+ len = (len + mask) & ~mask;
+ len -= offset & mask;
+ 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;
+
+ __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
@@ -169,8 +127,6 @@
+
+static void split_firmware(struct mtd_info *master, struct mtd_part *part)
+{
+ if (config_enabled(CONFIG_MTD_UIMAGE_SPLIT))
+ split_uimage(master, part);
+}
+
+void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
@@ -195,7 +151,7 @@
/*
* 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
@@ -656,6 +738,7 @@ int add_mtd_partitions(struct mtd_info *
@@ -656,6 +699,7 @@ int add_mtd_partitions(struct mtd_info *
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);