doc/secure_boot_v2: Fix the steps mentioned for enabling secure boot
@@ -173,21 +173,23 @@ eFuse usage
How To Enable Secure Boot V2
----------------------------
-1. Open the :ref:`project-configuration-menu`, in "Security Features" set "Enable hardware Secure Boot in bootloader" to enable Secure Boot.
+1. Open the :ref:`project-configuration-menu`, in "Security features" set "Enable hardware Secure Boot in bootloader" to enable Secure Boot.
.. only:: esp32
2. For ESP32, Secure Boot V2 is available only ESP32 ECO3 onwards. To view the "Secure Boot V2" option the chip revision should be changed to revision 3 (ESP32- ECO3). To change the chip revision, set "Minimum Supported ESP32 Revision" to Rev 3 in "Component Config" -> "ESP32- Specific".
- 3. Specify the secure boot signing key path. The file can be anywhere on your system. A relative path will be evaluated from the project directory. The file does not need to exist yet.
- 4. Select the UART ROM download mode in "Security features -> UART ROM download mode". By default the UART ROM download mode has been kept enabled in order to prevent permanently disabling it in the development phase, this option is a potentially insecure option. It is recommended to disable the UART download mode for better security.
+ 3. Specify the path to secure boot signing key, relative to the project directory.
+
+ 4. Select the desired UART ROM download mode in "UART ROM download mode". By default the UART ROM download mode has been kept enabled in order to prevent permanently disabling it in the development phase, this option is a potentially insecure option. It is recommended to disable the UART download mode for better security.
.. only:: esp32s2 or esp32c3
2. The "Secure Boot V2" option will be selected and the "App Signing Scheme" would be set to RSA by default.
- 3. Select the number of keys to be used to sign the bootloader binary and chose one of them to sign the application. Specify the secure boot signing key paths for each one of these. The file can be anywhere on your system. A relative path will be evaluated from the project directory. The file does not need to exist yet.
- 4. Select the UART ROM download mode in "Security features -> UART ROM download mode".
+ 3. Specify the path to secure boot signing key, relative to the project directory.
+
+ 4. Select the desired UART ROM download mode in "UART ROM download mode". By default, it is set to "Permanently switch to Secure mode" which is generally recommended. For production devices, the most secure option is to set it to "Permanently disabled".
5. Set other menuconfig options (as desired). Pay particular attention to the "Bootloader Config" options, as you can only flash the bootloader once. Then exit menuconfig and save your configuration.
