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489 lines
15 KiB
Diff
489 lines
15 KiB
Diff
--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -49,6 +49,16 @@ config MTD_PARTITIONS
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devices. Partitioning on NFTL 'devices' is a different - that's the
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'normal' form of partitioning used on a block device.
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+config MTD_ROOTFS_ROOT_DEV
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+ bool "Automatically set 'rootfs' partition to be root filesystem"
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+ depends on MTD_PARTITIONS
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+ default y
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+
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+config MTD_ROOTFS_SPLIT
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+ bool "Automatically split 'rootfs' partition for squashfs"
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+ depends on MTD_PARTITIONS
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+ default y
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+
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config MTD_REDBOOT_PARTS
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tristate "RedBoot partition table parsing"
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depends on MTD_PARTITIONS
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -20,6 +20,8 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/compatmac.h>
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+#include <linux/squashfs_fs.h>
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+#include <linux/root_dev.h>
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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@@ -308,6 +310,266 @@ int del_mtd_partitions(struct mtd_info *
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return 0;
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}
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+static u_int32_t cur_offset = 0;
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+static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
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+ int i, struct mtd_part **slp)
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+{
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+ struct mtd_part *slave;
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+
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+ /* allocate the partition structure */
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+ slave = kzalloc (sizeof(*slave), GFP_KERNEL);
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+ if (!slave) {
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+ printk ("memory allocation error while creating partitions for \"%s\"\n",
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+ master->name);
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+ del_mtd_partitions(master);
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+ return -ENOMEM;
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+ }
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+ list_add(&slave->list, &mtd_partitions);
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+
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+ /* set up the MTD object for this partition */
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+ slave->mtd.type = master->type;
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+ slave->mtd.flags = master->flags & ~part->mask_flags;
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+ slave->mtd.size = part->size;
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+ slave->mtd.writesize = master->writesize;
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+ slave->mtd.oobsize = master->oobsize;
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+ slave->mtd.oobavail = master->oobavail;
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+ slave->mtd.subpage_sft = master->subpage_sft;
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+
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+ slave->mtd.name = part->name;
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+ slave->mtd.bank_size = master->bank_size;
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+ slave->mtd.owner = master->owner;
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+
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+ slave->mtd.read = part_read;
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+ slave->mtd.write = part_write;
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+
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+ if(master->point && master->unpoint){
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+ slave->mtd.point = part_point;
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+ slave->mtd.unpoint = part_unpoint;
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+ }
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+
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+ if (master->read_oob)
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+ slave->mtd.read_oob = part_read_oob;
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+ if (master->write_oob)
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+ slave->mtd.write_oob = part_write_oob;
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+ if(master->read_user_prot_reg)
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+ slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
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+ if(master->read_fact_prot_reg)
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+ slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
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+ if(master->write_user_prot_reg)
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+ slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
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+ if(master->lock_user_prot_reg)
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+ slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
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+ if(master->get_user_prot_info)
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+ slave->mtd.get_user_prot_info = part_get_user_prot_info;
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+ if(master->get_fact_prot_info)
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+ slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
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+ if (master->sync)
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+ slave->mtd.sync = part_sync;
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+ if (!i && master->suspend && master->resume) {
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+ slave->mtd.suspend = part_suspend;
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+ slave->mtd.resume = part_resume;
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+ }
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+ if (master->writev)
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+ slave->mtd.writev = part_writev;
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+ if (master->lock)
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+ slave->mtd.lock = part_lock;
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+ if (master->unlock)
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+ slave->mtd.unlock = part_unlock;
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+ if (master->block_isbad)
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+ slave->mtd.block_isbad = part_block_isbad;
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+ if (master->block_markbad)
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+ slave->mtd.block_markbad = part_block_markbad;
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+ slave->mtd.erase = part_erase;
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+ slave->master = master;
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+ slave->offset = part->offset;
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+ slave->index = i;
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+
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+ if (slave->offset == MTDPART_OFS_APPEND)
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+ slave->offset = cur_offset;
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+ if (slave->offset == MTDPART_OFS_NXTBLK) {
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+ slave->offset = cur_offset;
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+ if ((cur_offset % master->erasesize) != 0) {
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+ /* Round up to next erasesize */
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+ slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
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+ printk(KERN_NOTICE "Moving partition %d: "
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+ "0x%08x -> 0x%08x\n", i,
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+ cur_offset, slave->offset);
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+ }
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+ }
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+ if (slave->mtd.size == MTDPART_SIZ_FULL)
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+ slave->mtd.size = master->size - slave->offset;
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+ cur_offset = slave->offset + slave->mtd.size;
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+
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+ printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
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+ slave->offset + slave->mtd.size, slave->mtd.name);
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+
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+ /* let's do some sanity checks */
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+ if (slave->offset >= master->size) {
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+ /* let's register it anyway to preserve ordering */
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+ slave->offset = 0;
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+ slave->mtd.size = 0;
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+ printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
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+ part->name);
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+ }
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+ if (slave->offset + slave->mtd.size > master->size) {
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+ slave->mtd.size = master->size - slave->offset;
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+ printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
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+ part->name, master->name, slave->mtd.size);
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+ }
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+ if (master->numeraseregions>1) {
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+ /* Deal with variable erase size stuff */
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+ int i;
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+ struct mtd_erase_region_info *regions = master->eraseregions;
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+
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+ /* Find the first erase regions which is part of this partition. */
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+ for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
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+ ;
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+
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+ for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
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+ if (slave->mtd.erasesize < regions[i].erasesize) {
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+ slave->mtd.erasesize = regions[i].erasesize;
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+ }
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+ }
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+ } else {
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+ /* Single erase size */
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+ slave->mtd.erasesize = master->erasesize;
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+ }
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+
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+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
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+ (slave->offset % slave->mtd.erasesize)) {
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+ /* Doesn't start on a boundary of major erase size */
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+ /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
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+ slave->mtd.flags &= ~MTD_WRITEABLE;
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+ printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
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+ part->name);
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+ }
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+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
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+ (slave->mtd.size % slave->mtd.erasesize)) {
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+ slave->mtd.flags &= ~MTD_WRITEABLE;
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+ printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
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+ part->name);
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+ }
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+
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+ slave->mtd.ecclayout = master->ecclayout;
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+ if (master->block_isbad) {
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+ uint32_t offs = 0;
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+
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+ while(offs < slave->mtd.size) {
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+ if (master->block_isbad(master,
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+ offs + slave->offset))
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+ slave->mtd.ecc_stats.badblocks++;
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+ offs += slave->mtd.erasesize;
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+ }
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+ }
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+
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+ if(part->mtdp)
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+ { /* store the object pointer (caller may or may not register it */
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+ *part->mtdp = &slave->mtd;
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+ slave->registered = 0;
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+ }
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+ else
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+ {
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+ /* register our partition */
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+ add_mtd_device(&slave->mtd);
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+ slave->registered = 1;
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+ }
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+
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+ if (slp)
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+ *slp = slave;
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_MTD_ROOTFS_SPLIT
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+#define ROOTFS_SPLIT_NAME "rootfs_data"
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+static int split_squashfs(struct mtd_info *master, struct mtd_partition *old,
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+ struct mtd_partition **new)
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+{
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+ struct mtd_partition *part = NULL;
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+ int len;
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+ char buf[512];
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+ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
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+ int ret;
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+
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+ ret = master->read(master, old->offset, sizeof(*sb), &len, buf);
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+ if (ret) {
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+ printk(KERN_ALERT "split_squashfs: error occured while reading "
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+ "from \"%s\"\n", master->name);
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+ goto out;
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+ }
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+
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+ if (len != sizeof(*sb)) {
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+ printk(KERN_ALERT "split_squashfs: unable to read superblock "
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+ "from \"%s\"\n", master->name);
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+ ret=-1;
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+ goto out;
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+ }
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+
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+ if (*((u32 *) buf) != SQUASHFS_MAGIC) {
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+ printk(KERN_ALERT "split_squasfs: no squashfs found in \"%s\"\n",
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+ master->name);
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+ ret=0;
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+ goto out;
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+ }
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+
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+ if (sb->bytes_used <= 0) {
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+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
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+ master->name);
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+ ret=0;
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+ goto out;
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+ }
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+
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+ part = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
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+ if (part == NULL) {
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+ printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
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+ ROOTFS_SPLIT_NAME);
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+ ret = -ENOMEM;
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+ goto out;
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+ }
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+
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+ memcpy(part, old, sizeof(*part));
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+ part->name = (unsigned char *)&part[1];
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+ strcpy(part->name, ROOTFS_SPLIT_NAME);
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+
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+ len = (u32) sb->bytes_used;
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+ len += (part->offset & 0x000fffff);
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+ len += (master->erasesize - 1);
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+ len &= ~(master->erasesize - 1);
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+ len -= (part->offset & 0x000fffff);
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+ part->offset += len;
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+ part->size -= len;
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+
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+ ret = 0;
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+
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+out:
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+ *new = part;
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+ return ret;
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+}
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+
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+static int split_rootfs_data(struct mtd_info *master, struct mtd_partition *part,
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+ int index)
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+{
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+ struct mtd_partition *dpart;
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+ int ret;
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+
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+ ret = split_squashfs(master, part, &dpart);
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+ if (ret)
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+ return ret;
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+
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+ if (dpart == NULL)
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+ return 1;
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+
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+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%X, len=%X \n",
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+ ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
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+
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+ ret = add_one_partition(master, dpart, index, NULL);
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+ if (ret)
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+ kfree(dpart);
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+
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+ return ret;
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+}
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+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
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+
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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@@ -320,169 +582,31 @@ int add_mtd_partitions(struct mtd_info *
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int nbparts)
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{
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struct mtd_part *slave;
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- u_int32_t cur_offset = 0;
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- int i;
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+ struct mtd_partition *part;
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+ int i, j, ret = 0;
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printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
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- for (i = 0; i < nbparts; i++) {
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-
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- /* allocate the partition structure */
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- slave = kzalloc (sizeof(*slave), GFP_KERNEL);
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- if (!slave) {
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- printk ("memory allocation error while creating partitions for \"%s\"\n",
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- master->name);
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- del_mtd_partitions(master);
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- return -ENOMEM;
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- }
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- list_add(&slave->list, &mtd_partitions);
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-
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- /* set up the MTD object for this partition */
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- slave->mtd.type = master->type;
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- slave->mtd.flags = master->flags & ~parts[i].mask_flags;
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- slave->mtd.size = parts[i].size;
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- slave->mtd.writesize = master->writesize;
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- slave->mtd.oobsize = master->oobsize;
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- slave->mtd.oobavail = master->oobavail;
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- slave->mtd.subpage_sft = master->subpage_sft;
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-
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- slave->mtd.name = parts[i].name;
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- slave->mtd.bank_size = master->bank_size;
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- slave->mtd.owner = master->owner;
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-
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- slave->mtd.read = part_read;
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- slave->mtd.write = part_write;
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-
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- if(master->point && master->unpoint){
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- slave->mtd.point = part_point;
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- slave->mtd.unpoint = part_unpoint;
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- }
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-
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- if (master->read_oob)
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- slave->mtd.read_oob = part_read_oob;
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- if (master->write_oob)
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- slave->mtd.write_oob = part_write_oob;
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- if(master->read_user_prot_reg)
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- slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
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- if(master->read_fact_prot_reg)
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- slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
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- if(master->write_user_prot_reg)
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- slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
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- if(master->lock_user_prot_reg)
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- slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
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- if(master->get_user_prot_info)
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- slave->mtd.get_user_prot_info = part_get_user_prot_info;
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- if(master->get_fact_prot_info)
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- slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
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- if (master->sync)
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- slave->mtd.sync = part_sync;
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- if (!i && master->suspend && master->resume) {
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- slave->mtd.suspend = part_suspend;
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- slave->mtd.resume = part_resume;
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- }
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- if (master->writev)
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- slave->mtd.writev = part_writev;
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- if (master->lock)
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- slave->mtd.lock = part_lock;
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- if (master->unlock)
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- slave->mtd.unlock = part_unlock;
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- if (master->block_isbad)
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- slave->mtd.block_isbad = part_block_isbad;
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- if (master->block_markbad)
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- slave->mtd.block_markbad = part_block_markbad;
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- slave->mtd.erase = part_erase;
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- slave->master = master;
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- slave->offset = parts[i].offset;
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- slave->index = i;
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-
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- if (slave->offset == MTDPART_OFS_APPEND)
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- slave->offset = cur_offset;
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- if (slave->offset == MTDPART_OFS_NXTBLK) {
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- slave->offset = cur_offset;
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- if ((cur_offset % master->erasesize) != 0) {
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- /* Round up to next erasesize */
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- slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
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- printk(KERN_NOTICE "Moving partition %d: "
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- "0x%08x -> 0x%08x\n", i,
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- cur_offset, slave->offset);
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- }
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- }
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- if (slave->mtd.size == MTDPART_SIZ_FULL)
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- slave->mtd.size = master->size - slave->offset;
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- cur_offset = slave->offset + slave->mtd.size;
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-
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- printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
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- slave->offset + slave->mtd.size, slave->mtd.name);
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-
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- /* let's do some sanity checks */
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- if (slave->offset >= master->size) {
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- /* let's register it anyway to preserve ordering */
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- slave->offset = 0;
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- slave->mtd.size = 0;
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- printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
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- parts[i].name);
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- }
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- if (slave->offset + slave->mtd.size > master->size) {
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- slave->mtd.size = master->size - slave->offset;
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- printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
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- parts[i].name, master->name, slave->mtd.size);
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- }
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- if (master->numeraseregions>1) {
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- /* Deal with variable erase size stuff */
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- int i;
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- struct mtd_erase_region_info *regions = master->eraseregions;
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-
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- /* Find the first erase regions which is part of this partition. */
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- for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
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- ;
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-
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- for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
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- if (slave->mtd.erasesize < regions[i].erasesize) {
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- slave->mtd.erasesize = regions[i].erasesize;
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- }
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- }
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- } else {
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- /* Single erase size */
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- slave->mtd.erasesize = master->erasesize;
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- }
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-
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- if ((slave->mtd.flags & MTD_WRITEABLE) &&
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- (slave->offset % slave->mtd.erasesize)) {
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- /* Doesn't start on a boundary of major erase size */
|
|
- /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
|
|
- slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
- printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
|
|
- parts[i].name);
|
|
- }
|
|
- if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
- (slave->mtd.size % slave->mtd.erasesize)) {
|
|
- slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
- printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
|
|
- parts[i].name);
|
|
- }
|
|
-
|
|
- slave->mtd.ecclayout = master->ecclayout;
|
|
- if (master->block_isbad) {
|
|
- uint32_t offs = 0;
|
|
-
|
|
- while(offs < slave->mtd.size) {
|
|
- if (master->block_isbad(master,
|
|
- offs + slave->offset))
|
|
- slave->mtd.ecc_stats.badblocks++;
|
|
- offs += slave->mtd.erasesize;
|
|
+ for (i = 0, j = 0; i < nbparts; i++) {
|
|
+ part = (struct mtd_partition *) &parts[i];
|
|
+ ret = add_one_partition(master, part, j, &slave);
|
|
+ if (ret)
|
|
+ return ret;
|
|
+ j++;
|
|
+
|
|
+ if (strcmp(part->name, "rootfs") == 0 && slave->registered) {
|
|
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
|
|
+ if (ROOT_DEV == 0) {
|
|
+ printk(KERN_NOTICE "mtd: partition \"rootfs\" "
|
|
+ "set to be root filesystem\n");
|
|
+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
|
|
}
|
|
- }
|
|
-
|
|
- if(parts[i].mtdp)
|
|
- { /* store the object pointer (caller may or may not register it */
|
|
- *parts[i].mtdp = &slave->mtd;
|
|
- slave->registered = 0;
|
|
- }
|
|
- else
|
|
- {
|
|
- /* register our partition */
|
|
- add_mtd_device(&slave->mtd);
|
|
- slave->registered = 1;
|
|
+#endif
|
|
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
|
|
+ ret = split_rootfs_data(master, part, j);
|
|
+ if (ret == 0)
|
|
+ j++;
|
|
+#endif
|
|
}
|
|
}
|
|
|