Ignore the AlternateLBA field in the GPT headers.

src/platform/vboot_reference/tests/cgptlib_test.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <string.h>
 
 #include "cgptlib.h"
 #include "cgptlib_internal.h"
 #include "cgptlib_test.h"
@@ skipping 436 matching lines @@
   EXPECT(1 == CheckHeader(h1, 0, gpt->drive_sectors));
   EXPECT(1 == CheckHeader(h2, 1, gpt->drive_sectors));
 
   BuildTestGptData(gpt);
   h1->my_lba = 2;
   h2->my_lba--;
   RefreshCrc32(gpt);
   EXPECT(1 == CheckHeader(h1, 0, gpt->drive_sectors));
   EXPECT(1 == CheckHeader(h2, 1, gpt->drive_sectors));
 
   BuildTestGptData(gpt);

[Randall Spangler, 2010/06/03 22:04:22]

Add a comment that we're explicitly ignoring the alternate_lba field

   h1->alternate_lba++;
   h2->alternate_lba++;
   RefreshCrc32(gpt);
-  EXPECT(1 == CheckHeader(h1, 0, gpt->drive_sectors));
-  EXPECT(1 == CheckHeader(h2, 1, gpt->drive_sectors));
+  EXPECT(0 == CheckHeader(h1, 0, gpt->drive_sectors));
+  EXPECT(0 == CheckHeader(h2, 1, gpt->drive_sectors));
 
   BuildTestGptData(gpt);
   h1->alternate_lba--;
   h2->alternate_lba--;
   RefreshCrc32(gpt);
-  EXPECT(1 == CheckHeader(h1, 0, gpt->drive_sectors));
-  EXPECT(1 == CheckHeader(h2, 1, gpt->drive_sectors));
+  EXPECT(0 == CheckHeader(h1, 0, gpt->drive_sectors));
+  EXPECT(0 == CheckHeader(h2, 1, gpt->drive_sectors));
 
   BuildTestGptData(gpt);
   h1->entries_lba++;
   h2->entries_lba++;
   RefreshCrc32(gpt);
   EXPECT(1 == CheckHeader(h1, 0, gpt->drive_sectors));
   EXPECT(1 == CheckHeader(h2, 1, gpt->drive_sectors));
 
   BuildTestGptData(gpt);
   h1->entries_lba--;
@@ skipping 651 matching lines @@
     printf(COL_RED "The following %d test cases are failed:\n" COL_STOP,
            error_count);
     for (i = 0; i < sizeof(test_cases)/sizeof(test_cases[0]); ++i) {
       if (test_cases[i].retval)
         printf("  %s()\n", test_cases[i].name);
     }
   }
 
   return (error_count) ? 1 : 0;
 }