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| author | Przemyslaw Marczak <p.marczak@samsung.com> | 2014-04-02 10:20:06 +0200 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-04-02 16:36:06 -0400 |
| commit | 39206382dea929b6a834c212b431821e06e68f39 (patch) | |
| tree | e6eba4856ca5f0a66fa9756ae3bcdf37538bd565 /doc | |
| parent | 89c8230dec063d894aec1a7b5c58f1dcadced738 (diff) | |
| download | u-boot-imx-39206382dea929b6a834c212b431821e06e68f39.zip u-boot-imx-39206382dea929b6a834c212b431821e06e68f39.tar.gz u-boot-imx-39206382dea929b6a834c212b431821e06e68f39.tar.bz2 | |
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')
| -rw-r--r-- | doc/README.gpt | 22 |
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. |