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docs: add a note regarding EFuse Block9 key purpose quirk for some chips

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Mahavir Jain 2023-04-05 14:19:32 +05:30
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docs/en/api-reference/system/efuse.rst
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@ -29,6 +29,8 @@ For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *eFuse Co
.. only:: not esp32 and not esp32c2
.. list::
{IDF_TARGET_NAME} has 11 eFuse blocks each of the size of 256 bits (not all bits are available):
* EFUSE_BLK0 is used entirely for system purposes;
@ -40,7 +42,9 @@ For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *eFuse Co
* EFUSE_BLK6 (also named EFUSE_BLK_KEY2) can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK7 (also named EFUSE_BLK_KEY3) can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK8 (also named EFUSE_BLK_KEY4) can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK9 (also named EFUSE_BLK_KEY5) can be used as key (for secure_boot or flash_encryption) or for user purposes;
:SOC_EFUSE_BLOCK9_KEY_PURPOSE_QUIRK and SOC_ECDSA_SUPPORTED: * EFUSE_BLK9 (also named EFUSE_BLK_KEY5) can be used for any purpose except for flash encryption or ECDSA (due to a HW bug);
:SOC_EFUSE_BLOCK9_KEY_PURPOSE_QUIRK and not SOC_ECDSA_SUPPORTED: * EFUSE_BLK9 (also named EFUSE_BLK_KEY5) can be used for any purpose except for flash encryption (due to a HW bug);
:not SOC_EFUSE_BLOCK9_KEY_PURPOSE_QUIRK: * EFUSE_BLK9 (also named EFUSE_BLK_KEY5) can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK10 (also named EFUSE_BLK_SYS_DATA_PART2) is reseved for system purposes.
.. only:: esp32c2