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Merge branch 'bugfix/docs_update_anti_rollback_note' into 'master'

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docs: ota: fix note about security version efuse size

See merge request espressif/esp-idf!15620
This commit is contained in:
Mahavir Jain 2021-10-25 11:30:38 +00:00
commit d33ce7cb59
1 changed files with 7 additions and 3 deletions
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10
docs/en/api-reference/system/ota.rst
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@ -165,9 +165,13 @@ If you want to avoid the download/erase overhead in case of the app from the ser
Restrictions:
- The number of bits in the ``secure_version`` field is limited to 32 bits. This means that only 32 times you can do an anti-rollback. You can reduce the length of this efuse field use :ref:`CONFIG_BOOTLOADER_APP_SEC_VER_SIZE_EFUSE_FIELD` option.
- Anti-rollback only works if the encoding scheme for efuse is set to ``NONE``.
- The partition table should not have a factory partition, only two of the app.
.. list::
:esp32: - The number of bits in the ``secure_version`` field is limited to 32 bits. This means that only 32 times you can do an anti-rollback. You can reduce the length of this efuse field using :ref:`CONFIG_BOOTLOADER_APP_SEC_VER_SIZE_EFUSE_FIELD` option.
:not esp32: - The number of bits in the ``secure_version`` field is limited to 16 bits. This means that only 16 times you can do an anti-rollback. You can reduce the length of this efuse field using :ref:`CONFIG_BOOTLOADER_APP_SEC_VER_SIZE_EFUSE_FIELD` option.
:esp32: - Anti-rollback works only if the encoding scheme for efuse is set to ``NONE``.
- Factory partition is not supported in anti rollback scheme and hence partition table should not have partition with SubType set to ``factory``.
- Test partition is not supported in anti rollback scheme and hence partition table should not have partition with SubType set to ``test``.
``security_version``: