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authorSteve Rae <srae@broadcom.com>2014-05-05 13:00:08 -0700
committerTom Rini <trini@ti.com>2014-05-12 15:20:05 -0400
commitae95fad5af3793ae804b4390727e0f431e5514d7 (patch)
tree65de51deeb3eef975b9f593f1cb9f36c1d3a1dbb /doc
parentfa39ffe5d61bd7f34b2ff579f5f6bb8f92a6b9b1 (diff)
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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')
-rw-r--r--doc/README.gpt14
1 files changed, 7 insertions, 7 deletions
diff --git a/doc/README.gpt b/doc/README.gpt
index f822894..ec0156d 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: