The fields 'uuid' and 'uuid_disk' are optional if CONFIG_RANDOM_UUID is
enabled. A random uuid will be used if omitted or they point to an empty/
non-existent environment variable. The environment variable will be set to
- the generated UUID.
+ the generated UUID. The 'gpt guid' command reads the current value of the
+ uuid_disk from the GPT.
The field 'bootable' is optional, it is used to mark the GPT partition
bootable (set attribute flags "Legacy BIOS bootable").