part: extract MBR signature from partitions

[u-boot] / disk / part_dos.c

diff --git a/disk/part_dos.c b/disk/part_dos.c
index 7aff73d6f8c8cb547dd750d60281f3b57076538a..1a36be0446ac06d30ce23aa4dfedfd3fa16a6827 100644 (file)
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -89,14 +89,20 @@ static int test_block_type(unsigned char *buffer)
 
 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;
 }