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authorPrzemyslaw Marczak <p.marczak@samsung.com>2014-04-02 10:20:06 +0200
committerTom Rini <trini@ti.com>2014-04-02 16:36:06 -0400
commit39206382dea929b6a834c212b431821e06e68f39 (patch)
treee6eba4856ca5f0a66fa9756ae3bcdf37538bd565 /doc/README.gpt
parent89c8230dec063d894aec1a7b5c58f1dcadced738 (diff)
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cmd:gpt: randomly generate each partition uuid if undefined
Changes: - randomly generate partition uuid if any is undefined and CONFIG_RAND_UUID is defined - print debug info about set/unset/generated uuid - update doc/README.gpt Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Lukasz Majewski <l.majewski@samsung.com> Cc: Piotr Wilczek <p.wilczek@samsung.com> Cc: Tom Rini <trini@ti.com> Cc: Stephen Warren <swarren@nvidia.com> Cc: Lukasz Majewski <l.majewski@samsung.com>
Diffstat (limited to 'doc/README.gpt')
-rw-r--r--doc/README.gpt22
1 files changed, 17 insertions, 5 deletions
diff --git a/doc/README.gpt b/doc/README.gpt
index 5c133f3..f822894 100644
--- a/doc/README.gpt
+++ b/doc/README.gpt
@@ -132,8 +132,8 @@ of the Primary.
----------------------
Offset Size Description
- 0 16 B Partition type GUID
- 16 16 B Unique partition GUID
+ 0 16 B Partition type GUID (Big Endian)
+ 16 16 B Unique partition GUID in (Big Endian)
32 8 B First LBA (Little Endian)
40 8 B Last LBA (inclusive)
48 8 B Attribute flags [+]
@@ -160,6 +160,9 @@ To restore GUID partition table one needs to:
Fields 'name', 'size' and 'uuid' are mandatory for every partition.
The field 'start' is optional.
+ option: CONFIG_RANDOM_UUID
+ If any partition "UUID" no exists then it is randomly generated.
+
2. Define 'CONFIG_EFI_PARTITION' and 'CONFIG_CMD_GPT'
2. From u-boot prompt type:
@@ -168,11 +171,20 @@ To restore GUID partition table one needs to:
Useful info:
============
-Two programs, namely: 'fdisk' and 'parted' are recommended to work with GPT
-recovery. Parted is able to handle GUID partitions. Unfortunately the 'fdisk'
-hasn't got such ability.
+Two programs, namely: 'gdisk' and 'parted' are recommended to work with GPT
+recovery. Both are able to handle GUID partitions.
Please, pay attention at -l switch for parted.
"uuid" program is recommended to generate UUID string. Moreover it can decode
(-d switch) passed in UUID string. It can be used to generate partitions UUID
passed to u-boot environment variables.
+If optional CONFIG_RANDOM_UUID is defined then for any partition which environment
+uuid is unset, uuid is randomly generated and stored in correspond environment
+variable.
+
+note:
+Each string block of UUID generated by program "uuid" is in big endian and it is
+also stored in big endian in disk GPT.
+Partitions layout can be printed by typing "mmc part". Note that each partition
+GUID has different byte order than UUID generated before, this is because first
+three blocks of GUID string are in Little Endian.