part: extract MBR signature from partitions
EFI client programs need the signature information from the partition
table to determine the disk a partition is on, so we need to fill that
in here.
Signed-off-by: Peter Jones <pjones@redhat.com>
[separated from efi_loader part, and fixed build-errors for non-
CONFIG_EFI_PARTITION case]
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/disk/part_dos.c b/disk/part_dos.c
index 7aff73d..1a36be0 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -89,14 +89,20 @@
static int part_test_dos(struct blk_desc *dev_desc)
{
- ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
+ ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);
- if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
+ if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
return -1;
- if (test_block_type(buffer) != DOS_MBR)
+ if (test_block_type((unsigned char *)mbr) != DOS_MBR)
return -1;
+ if (dev_desc->sig_type == SIG_TYPE_NONE &&
+ mbr->unique_mbr_signature != 0) {
+ dev_desc->sig_type = SIG_TYPE_MBR;
+ dev_desc->mbr_sig = mbr->unique_mbr_signature;
+ }
+
return 0;
}