u-boot/doc/README.gpt

15 - GPT (GUID Partition Table) - it is the EFI standard part
21 This document describes the GPT partition table format and usage of
34 For instance, GUID of Basic data partition: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
61 	LBA 34         |Partition 1                      |
64 		       |Partition 2                      |
67 		       |Partition n                      |
82 Its first partition entry ID has 0xEE value, and disk software, which is not
85 It is possible to define 128 linearly placed partition entries.
102 40      8 B     First usable LBA for partitions (primary partition table last
104 48      8 B     Last usable LBA (secondary partition table first LBA - 1)
106 72      8 B     Partition entries starting LBA (always 2 in primary copy)
107 80      4 B     Number of partition entries
108 84      4 B     Size of a partition entry (usually 128)
109 88      4 B     CRC32 of partition array
117 GPT headers and partition entries are protected by CRC32 (the POSIX CRC32).
125 CRC32 for partition entries (field "CRC32 of partition array") is calculated for
132 	   Partition Entry Format:
136 	   0       16 B    Partition type GUID (Big Endian)
137 	   16      16 B    Unique partition GUID in (Big Endian)
141 	   56      72 B    Partition name (text)
144 	   Bit 0  - System partition
147 	   Bit 48-63 - Defined and used by the individual partition type
148 	   For Basic data partition :
156 To restore GUID partition table one needs to:
157 1. Define partition layout in the environment.
165    The fields 'name' and 'size' are mandatory for every partition.
168    If field 'size' of the last partition is 0, the partition is extended
177    The field 'bootable' is optional, it is used to mark the GPT partition
201 When provided, additionally partition data - name, size and starting
216 GPT partition names are a mechanism via which userspace and U-Boot can
221 employing 'swap' to exchange 'primary' and 'backup' partition names:
227 renamed.  In this example, mmc0's first partition will be renamed
242 Partition type GUID:
245 For created partition, the used partition type GUID is
249 can specify a other partition type guid:
276 They are also used to display the type of partition in "part list" command.
289 If optional CONFIG_RANDOM_UUID is defined then for any partition which environment
296 Partitions layout can be printed by typing "mmc part". Note that each partition