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| author | Steve Rae <srae@broadcom.com> | 2014-05-05 13:00:08 -0700 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-05-12 15:20:05 -0400 |
| commit | ae95fad5af3793ae804b4390727e0f431e5514d7 (patch) | |
| tree | 65de51deeb3eef975b9f593f1cb9f36c1d3a1dbb /doc/README.gpt | |
| parent | fa39ffe5d61bd7f34b2ff579f5f6bb8f92a6b9b1 (diff) | |
| download | blackbird-obmc-uboot-ae95fad5af3793ae804b4390727e0f431e5514d7.tar.gz blackbird-obmc-uboot-ae95fad5af3793ae804b4390727e0f431e5514d7.zip | |
disk: part_efi: add support for the Backup GPT
Check the Backup GPT table if the Primary GPT table is invalid.
Renamed "Secondary GPT" to "Backup GPT" as per:
UEFI Specification (Version 2.3.1, Errata A)
Signed-off-by: Steve Rae <srae@broadcom.com>
Diffstat (limited to 'doc/README.gpt')
| -rw-r--r-- | doc/README.gpt | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/doc/README.gpt b/doc/README.gpt index f822894709..ec0156d8aa 100644 --- a/doc/README.gpt +++ b/doc/README.gpt @@ -66,14 +66,14 @@ GPT brief explanation: |Partition n | | | ---------------------------------------------------------- - LBA -34 |Entry 1|Entry 2| Entry 3| Entry 4| Secondary - -------------------------------------------------- (bkp) - LBA -33 |Entries 5 - 128 | GPT + LBA -34 |Entry 1|Entry 2| Entry 3| Entry 4| Backup + -------------------------------------------------- GPT + LBA -33 |Entries 5 - 128 | | | | | LBA -2 | | -------------------------------------------------- - LBA -1 |Secondary GPT Header | + LBA -1 |Backup GPT Header | ---------------------------------------------------------- For a legacy reasons, GPT's LBA 0 sector has a MBR structure. It is called @@ -86,7 +86,7 @@ It is possible to define 128 linearly placed partition entries. "LBA -1" means the last addressable block (in the mmc subsystem: "dev_desc->lba - 1") -Primary/Secondary GPT header: +Primary/Backup GPT header: ---------------------------- Offset Size Description @@ -115,7 +115,7 @@ IMPORTANT: GPT headers and partition entries are protected by CRC32 (the POSIX CRC32). -Primary GPT header and Secondary GPT header have swapped values of "Current LBA" +Primary GPT header and Backup GPT header have swapped values of "Current LBA" and "Backup LBA" and therefore different CRC32 check-sum. CRC32 for GPT headers (field "CRC of header") are calculated up till @@ -125,7 +125,7 @@ CRC32 for partition entries (field "CRC32 of partition array") is calculated for the whole array entry ( Number_of_partition_entries * sizeof(partition_entry_size (usually 128))) -Observe, how Secondary GPT is placed in the memory. It is NOT a mirror reflect +Observe, how Backup GPT is placed in the memory. It is NOT a mirror reflect of the Primary. Partition Entry Format: |
