When setting aside a GPT partition for holding the U-Boot environment,
having a partition type GUID [1] indicating "Linux filesystem" (as
most tools default to) is somewhat misleading - and there's no other
well-known type GUID that is better suited. So to have a canonical
value to put into the type field, define
3de21764-95bd-54bd-a5c3-4abe786f38a8
to mean a partition holding a U-Boot environment.
This is a v5 namespace-name GUID [2], generated [3] from a namespace
of "25cbcde0-8642-47c6-a298-1a3a57cd256b" and name "U-Boot
environment".
Should future type GUIDs be defined in the context of U-Boot, it's
sensible to use that same namespace GUID.
[1] https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_type_GUIDs
[2]
https://en.wikipedia.org/wiki/Universally_unique_identifier#Versions_3_and_5_(namespace_name-based)
[3] https://www.uuidtools.com/v5
Signed-off-by: Rasmus Villemoes <rasmus.villem...@prevas.dk>
---
doc/README.gpt | 2 ++
include/part_efi.h | 3 +++
lib/uuid.c | 3 ++-
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/doc/README.gpt b/doc/README.gpt
index facd7afc3a..9e0d2221ef 100644
--- a/doc/README.gpt
+++ b/doc/README.gpt
@@ -267,6 +267,8 @@ Some strings can be also used at the place of known GUID :
(0657FD6D-A4AB-43C4-84E5-0933C84B4F4F)
"lvm" = PARTITION_LINUX_LVM_GUID
(E6D6D379-F507-44C2-A23C-238F2A3DF928)
+ "u-boot-env" = PARTITION_U_BOOT_ENVIRONMENT
+ (3DE21764-95BD-54BD-A5C3-4ABE786F38A8)
"uuid_disk=...;name=u-boot,size=60MiB,uuid=...;
name=kernel,size=60MiB,uuid=...,type=linux;"
diff --git a/include/part_efi.h b/include/part_efi.h
index 1929e4400f..c68529b4da 100644
--- a/include/part_efi.h
+++ b/include/part_efi.h
@@ -56,6 +56,9 @@
#define PARTITION_LINUX_LVM_GUID \
EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+#define PARTITION_U_BOOT_ENVIRONMENT \
+ EFI_GUID( 0x3de21764, 0x95bd, 0x54bd, \
+ 0xa5, 0xc3, 0x4a, 0xbe, 0x78, 0x6f, 0x38, 0xa8)
/* linux/include/efi.h */
typedef u16 efi_char16_t;
diff --git a/lib/uuid.c b/lib/uuid.c
index 6cfb6cd449..54a93aacc9 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -96,7 +96,8 @@ static const struct {
{"linux", PARTITION_LINUX_FILE_SYSTEM_DATA_GUID},
{"raid", PARTITION_LINUX_RAID_GUID},
{"swap", PARTITION_LINUX_SWAP_GUID},
- {"lvm", PARTITION_LINUX_LVM_GUID}
+ {"lvm", PARTITION_LINUX_LVM_GUID},
+ {"u-boot-env", PARTITION_U_BOOT_ENVIRONMENT},
};
/*
--
2.23.0
