diff mbox series

[v4,2/4] disk: expose partition type flags

Message ID 20241012-b4-qcom-capsule-updates-v4-2-abd05f15255f@linaro.org
State New
Delegated to: Caleb Connolly
Headers show
Series qcom: implement capsule updates | expand

Commit Message

Caleb Connolly Oct. 12, 2024, 1:57 p.m. UTC 
GPT partition tables include two bytes worth of vendor defined
attributes, per partition. ChromeOS and Qualcomm both use these (with
different encoding!) to handle A/B slot switching with a retry counter.

Expose these via the disk_partition struct so that they can be parsed by
the relevant board code.

This will be used on Qualcomm boards to determine which slot we're
booting on so that we can flash capsule updates to the correct one.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
---
 disk/part_efi.c | 1 +
 include/part.h  | 1 +
 2 files changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/disk/part_efi.c b/disk/part_efi.c
index 580821a6ee9c..f302a2433cb6 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -291,8 +291,9 @@  int part_get_info_efi(struct blk_desc *desc, int part,
 	snprintf((char *)info->name, sizeof(info->name), "%s",
 		 print_efiname(&gpt_pte[part - 1]));
 	strcpy((char *)info->type, "U-Boot");
 	info->bootable = get_bootable(&gpt_pte[part - 1]);
+	info->type_flags = gpt_pte[part - 1].attributes.fields.type_guid_specific;
 	if (CONFIG_IS_ENABLED(PARTITION_UUIDS)) {
 		uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b,
 				(char *)disk_partition_uuid(info),
 				UUID_STR_FORMAT_GUID);
diff --git a/include/part.h b/include/part.h
index 797b542ef1ff..f68ed3bf3930 100644
--- a/include/part.h
+++ b/include/part.h
@@ -73,8 +73,9 @@  struct disk_partition {
 	 * PART_BOOTABLE		the MBR bootable flag is set
 	 * PART_EFI_SYSTEM_PARTITION	the partition is an EFI system partition
 	 */
 	int	bootable;
+	u16	type_flags;	/* top 16 bits of GPT partition attributes	*/
 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 	char	uuid[UUID_STR_LEN + 1];	/* filesystem UUID as string, if exists	*/
 #endif
 #ifdef CONFIG_PARTITION_TYPE_GUID