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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 committed by KonstantinKondrashov
parent 89d11be4a9
commit 9e6e5ba0ef
1 changed files with 11 additions and 8 deletions
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19
docs/en/api-reference/system/efuse.rst
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@ -27,19 +27,22 @@ For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *eFuse Co
.. only:: not esp32
.. 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;
* EFUSE_BLK1 is used entirely for system purposes;
* EFUSE_BLK2 is used entirely for system purposes;
* EFUSE_BLK3 or EFUSE_BLK_USER_DATA can be used for user purposes;
* EFUSE_BLK4 or EFUSE_BLK_KEY0 can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK5 or EFUSE_BLK_KEY1 can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK6 or EFUSE_BLK_KEY2 can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK7 or EFUSE_BLK_KEY3 can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK8 or EFUSE_BLK_KEY4 can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK9 or EFUSE_BLK_KEY5 can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK10 or EFUSE_BLK_SYS_DATA_PART2 is reseved for system purposes.
* EFUSE_BLK3 (also named EFUSE_BLK_USER_DATA) can be used for user purposes;
* EFUSE_BLK4 (also named EFUSE_BLK_KEY0) can be used as key (for secure_boot or flash_encryption) or for user purposes;
* EFUSE_BLK5 (also named EFUSE_BLK_KEY1) can be used as key (for secure_boot or flash_encryption) or for user purposes;
* 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;
:SOC_EFUSE_BLOCK9_KEY_PURPOSE_QUIRK: * 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.
Each block is divided into 8 32-bits registers.