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Support alternative GPT header signature

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In order to dual boot Windows and ChromeOS, Windows must
not find a GPT partition table on the disk. So change
ChromeOS to cope with an alternative signature "CHROMEOS"
instead of the standard "EFI PART"

BUG=chrome-os-partner:6108
TEST=rebuild chromeos, install it,
     run cgpt legacy /dev/sda
     dd if=/dev/sda of=/tmp/x bs=1k
     hexdump -C /tmp/X
     see the string CHROMEOS
BRANCH=link
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>

Change-Id: Ia88eff33b9880bd73a78c1b8e026c1f8298c4557
Reviewed-on: https://gerrit.chromium.org/gerrit/31264
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
This commit is contained in:
Stefan Reinauer
2012-08-23 15:06:25 -07:00
committed by Gerrit
parent 40d8651bb3
commit b7b865cfee
10 changed files with 156 additions and 10 deletions
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3
firmware/lib/cgptlib/cgptlib_internal.c
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@@ -45,7 +45,8 @@ int CheckHeader(GptHeader *h, int is_secondary, uint64_t drive_sectors) {
/* Make sure we're looking at a header of reasonable size before
* attempting to calculate CRC. */
if (Memcmp(h->signature, GPT_HEADER_SIGNATURE, GPT_HEADER_SIGNATURE_SIZE))
if (Memcmp(h->signature, GPT_HEADER_SIGNATURE, GPT_HEADER_SIGNATURE_SIZE) &&
Memcmp(h->signature, GPT_HEADER_SIGNATURE2, GPT_HEADER_SIGNATURE_SIZE))
return 1;
if (h->revision != GPT_HEADER_REVISION)
return 1;