[U-Boot] [PATCH] disk: part_efi: add support for the Alternate GPT

[Steve Rae]

Check the Alternate GPT table if the Primary GPT table is invalid.

Signed-off-by: Steve Rae <s...@broadcom.com>
---

 disk/part_efi.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/disk/part_efi.c b/disk/part_efi.c
index 216a292..ad899fa 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -93,7 +93,15 @@ void print_part_efi(block_dev_desc_t * dev_desc)
        if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
                         gpt_head, &gpt_pte) != 1) {
                printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
-               return;
+               if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
+                                gpt_head, &gpt_pte) != 1) {
+                       printf("%s: *** ERROR: Invalid Alternate GPT ***\n",
+                              __func__);
+                       return;
+               } else {
+                       printf("%s: ***        Using Alternate GPT ***\n",
+                              __func__);
+               }
        }
 
        debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
@@ -142,7 +150,15 @@ int get_partition_info_efi(block_dev_desc_t * dev_desc, 
int part,
        if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
                        gpt_head, &gpt_pte) != 1) {
                printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
-               return -1;
+               if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
+                                gpt_head, &gpt_pte) != 1) {
+                       printf("%s: *** ERROR: Invalid Alternate GPT ***\n",
+                              __func__);
+                       return -1;
+               } else {
+                       printf("%s: ***        Using Alternate GPT ***\n",
+                              __func__);
+               }
        }
 
        if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
-- 
1.8.5

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