From: Stefan Reinauer reinauer@chromium.org
ChromeOS uses a GPT partition table to partition the disk. However, Windows will refuse to install on a GPT partitioned disk if there is no EFI available (Even if there is an MBR, too) To hide the GPT partition table from Windows, we need to write it with a header magic other than "EFI PART". To support old and new systems, Check for the magic string "CHROMEOS" too.
Signed-off-by: Stefan Reinauer reinauer@chromium.org
Signed-off-by: Simon Glass sjg@chromium.org --- disk/part_efi.c | 3 ++- disk/part_efi.h | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/disk/part_efi.c b/disk/part_efi.c index 22a1dad..f2a2445 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -307,7 +307,8 @@ static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, }
/* Check the GPT header signature */ - if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { + if ((le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) && + (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE2)) { printf("GUID Partition Table Header signature is wrong:" "0x%llX != 0x%llX\n", (unsigned long long)le64_to_int(pgpt_head->signature), diff --git a/disk/part_efi.h b/disk/part_efi.h index 5903e7c..07e590d 100644 --- a/disk/part_efi.h +++ b/disk/part_efi.h @@ -37,7 +37,9 @@ #define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
#define GPT_BLOCK_SIZE 512 -#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL +#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL +#define GPT_HEADER_SIGNATURE2 0x534f454d4f524843ULL + #define GPT_HEADER_REVISION_V1 0x00010000 #define GPT_PRIMARY_PARTITION_TABLE_LBA 1ULL #define GPT_ENTRY_NAME "gpt"