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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
Download Patch File Download Diff File Expand all files Collapse all files

26
firmware/lib/vboot_kernel.c
View File

@@ -72,23 +72,35 @@ int AllocAndReadGptData(VbExDiskHandle_t disk_handle, GptData* gptdata) {
* Returns 0 if successful, 1 if error. */
int WriteAndFreeGptData(VbExDiskHandle_t disk_handle, GptData* gptdata) {
int legacy = 0;
uint64_t entries_sectors = TOTAL_ENTRIES_SIZE / gptdata->sector_bytes;
if (gptdata->primary_header) {
GptHeader* h = (GptHeader*)(gptdata->primary_header);
legacy = !Memcmp(h->signature, GPT_HEADER_SIGNATURE2,
GPT_HEADER_SIGNATURE_SIZE);
if (gptdata->modified & GPT_MODIFIED_HEADER1) {
VBDEBUG(("Updating GPT header 1\n"));
if (0 != VbExDiskWrite(disk_handle, 1, 1, gptdata->primary_header))
return 1;
if (legacy) {
VBDEBUG(("Not updating GPT header 1: legacy mode is enabled.\n"));
} else {
VBDEBUG(("Updating GPT header 1\n"));
if (0 != VbExDiskWrite(disk_handle, 1, 1, gptdata->primary_header))
return 1;
}
}
VbExFree(gptdata->primary_header);
}
if (gptdata->primary_entries) {
if (gptdata->modified & GPT_MODIFIED_ENTRIES1) {
VBDEBUG(("Updating GPT entries 1\n"));
if (0 != VbExDiskWrite(disk_handle, 2, entries_sectors,
gptdata->primary_entries))
return 1;
if (legacy) {
VBDEBUG(("Not updating GPT entries 1: legacy mode is enabled.\n"));
} else {
VBDEBUG(("Updating GPT entries 1\n"));
if (0 != VbExDiskWrite(disk_handle, 2, entries_sectors,
gptdata->primary_entries))
return 1;
}
}
VbExFree(gptdata->primary_entries);
}