From: Stephen Warren <swar...@nvidia.com>
The MSDOS/MBR partition table includes a 32-bit unique ID, often referred
to as the NT disk signature. When combined with a partition number within
the table, this can form a unique ID similar in concept to EFI/GPT's
partition UUID.
This patch generates UUIDs in the format 0002dd75-01, which matches the
format expected by the Linux kernel.
Signed-off-by: Stephen Warren <swar...@nvidia.com>
---
v2: New patch.
---
disk/part_dos.c | 15 ++++++++++++---
disk/part_dos.h | 2 +-
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/disk/part_dos.c b/disk/part_dos.c
index a43dd9c..f9b7931 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -163,7 +163,8 @@ static void print_partition_extended (block_dev_desc_t
*dev_desc, int ext_part_s
*/
static int get_partition_info_extended (block_dev_desc_t *dev_desc, int
ext_part_sector,
int relative, int part_num,
- int which_part, disk_partition_t *info)
+ int which_part, disk_partition_t *info,
+ unsigned int disksig)
{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
dos_partition_t *pt;
@@ -182,6 +183,11 @@ static int get_partition_info_extended (block_dev_desc_t
*dev_desc, int ext_part
return -1;
}
+#ifdef CONFIG_PARTITION_UUIDS
+ if (!ext_part_sector)
+ disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
+#endif
+
/* Print all primary/logical partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {
@@ -222,6 +228,9 @@ static int get_partition_info_extended (block_dev_desc_t
*dev_desc, int ext_part
}
/* sprintf(info->type, "%d, pt->sys_ind); */
sprintf ((char *)info->type, "U-Boot");
+#ifdef CONFIG_PARTITION_UUIDS
+ sprintf(info->uuid, "%08x-%02x", disksig, part_num);
+#endif
return 0;
}
@@ -240,7 +249,7 @@ static int get_partition_info_extended (block_dev_desc_t
*dev_desc, int ext_part
return get_partition_info_extended (dev_desc, lba_start,
ext_part_sector == 0 ? lba_start : relative,
- part_num, which_part, info);
+ part_num, which_part, info, disksig);
}
}
return -1;
@@ -254,7 +263,7 @@ void print_part_dos (block_dev_desc_t *dev_desc)
int get_partition_info_dos (block_dev_desc_t *dev_desc, int part,
disk_partition_t * info)
{
- return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
+ return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
}
diff --git a/disk/part_dos.h b/disk/part_dos.h
index de75542..7b77c1d 100644
--- a/disk/part_dos.h
+++ b/disk/part_dos.h
@@ -24,7 +24,7 @@
#ifndef _DISK_PART_DOS_H
#define _DISK_PART_DOS_H
-
+#define DOS_PART_DISKSIG_OFFSET 0x1b8
#define DOS_PART_TBL_OFFSET 0x1be
#define DOS_PART_MAGIC_OFFSET 0x1fe
#define DOS_PBR_FSTYPE_OFFSET 0x36
--
1.7.0.4
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