alex/esp-idf
alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2024-10-05 20:47:46 -04:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

docs: ota: fix note about security version efuse size

Browse Source
This commit is contained in:
Mahavir Jain 2021-10-25 09:55:35 +05:30
parent c499fe5fa5
commit cc284f1d87
1 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
docs/en/api-reference/system/ota.rst
View File

@ -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``: