[PATCH v1 3/4] env: scsi: Add support for partition type GUID based environment

[Balaji Selvanathan]

Add support for locating SCSI environment partition using GPT type
GUID instead of unique UUID. This enables the saveenv command to
work with partitions identified by their type rather than unique
identifiers, providing flexibility for systems where partition
UUIDs may vary across devices but types remain constant.

Introduce CONFIG_SCSI_ENV_PART_TYPE_GUID configuration option that
allows specifying a partition type GUID for environment storage.
When enabled, the environment subsystem uses the new type GUID
based lookup method via scsi_get_blk_by_type_guid() to find the
first matching partition.

This change maintains backward compatibility with the existing
UUID-based approach.

Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
---
 env/Kconfig |  7 +++++++
 env/scsi.c  | 13 +++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/env/Kconfig b/env/Kconfig
index b312f9b5324..97cb3d05daf 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -768,6 +768,13 @@ config SCSI_ENV_PART_UUID
 	help
 	  UUID of the SCSI partition that you want to store the environment in.
 
+config SCSI_ENV_PART_TYPE_GUID
+	string "SCSI partition type GUID for saving environment"
+	depends on ENV_IS_IN_SCSI
+	help
+	  Type GUID of the SCSI partition to store the environment in.
+	  Uses the first partition matching this type GUID.
+
 config ENV_USE_DEFAULT_ENV_TEXT_FILE
 	bool "Create default environment from file"
 	depends on !COMPILE_TEST
diff --git a/env/scsi.c b/env/scsi.c
index 207717e17b1..6182ae26679 100644
--- a/env/scsi.c
+++ b/env/scsi.c
@@ -35,8 +35,13 @@ static inline struct env_scsi_info *env_scsi_get_part(void)
 {
 	struct env_scsi_info *ep = &env_part;
 
+#ifdef CONFIG_SCSI_ENV_PART_TYPE_GUID
+	if (scsi_get_blk_by_type_guid(CONFIG_SCSI_ENV_PART_TYPE_GUID, &ep->blk, &ep->part))
+		return NULL;
+#else
 	if (scsi_get_blk_by_uuid(CONFIG_SCSI_ENV_PART_UUID, &ep->blk, &ep->part))
 		return NULL;
+#endif
 
 	ep->count = CONFIG_ENV_SIZE / ep->part.blksz;
 
@@ -83,12 +88,20 @@ static int env_scsi_load(void)
 	int ret;
 
 	if (!ep) {
+#ifdef CONFIG_SCSI_ENV_PART_TYPE_GUID
+		env_set_default(CONFIG_SCSI_ENV_PART_TYPE_GUID " partition not found", 0);
+#else
 		env_set_default(CONFIG_SCSI_ENV_PART_UUID " partition not found", 0);
+#endif
 		return -ENOENT;
 	}
 
 	if (blk_dread(ep->blk, ep->part.start, ep->count, &envbuf) != ep->count) {
+#ifdef CONFIG_SCSI_ENV_PART_TYPE_GUID
+		env_set_default(CONFIG_SCSI_ENV_PART_TYPE_GUID " partition read failed", 0);
+#else
 		env_set_default(CONFIG_SCSI_ENV_PART_UUID " partition read failed", 0);
+#endif
 		return -EIO;
 	}
 
-- 
2.34.1