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efuse: Add 'disable Download Mode' & ESP32-S2 'Secure Download Mode' functionality

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Angus Gratton
2020-04-25 16:36:53 +10:00
committed by Angus Gratton
parent 48d9c14c28
commit f64ae4fa99
11 changed files with 195 additions and 45 deletions
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39
components/efuse/include/esp_efuse.h
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@@ -308,15 +308,48 @@ void esp_efuse_reset(void);
* By default, if booting from flash fails the ESP32 will boot a
* BASIC console in ROM.
*
* Call this function (from bootloader or app) to permanently
* disable the console on this chip.
*
* Call this function (from bootloader or app) to permanently disable the console on this chip.
*
*/
void esp_efuse_disable_basic_rom_console(void);
#endif
/* @brief Disable ROM Download Mode via eFuse
*
* Permanently disables the ROM Download Mode feature. Once disabled, if the SoC is booted with
* strapping pins set for ROM Download Mode then an error is printed instead.
*
* @note Not all SoCs support this option. An error will be returned if called on an ESP32
* with a silicon revision lower than 3, as these revisions do not support this option.
*
* @note If ROM Download Mode is already disabled, this function does nothing and returns success.
*
* @return
* - ESP_OK If the eFuse was successfully burned, or had already been burned.
* - ESP_ERR_NOT_SUPPORTED (ESP32 only) This SoC is not capable of disabling UART download mode
* - ESP_ERR_INVALID_STATE (ESP32 only) This eFuse is write protected and cannot be written
*/
esp_err_t esp_efuse_disable_rom_download_mode(void);
#ifdef CONFIG_IDF_TARGET_ESP32S2
/* @brief Switch ROM Download Mode to Secure Download mode via eFuse
*
* Permanently enables Secure Download mode. This mode limits the use of ROM Download Mode functions
* to simple flash read, write and erase operations, plus a command to return a summary of currently
* enabled security features.
*
* @note If Secure Download mode is already enabled, this function does nothing and returns success.
*
* @note Disabling the ROM Download Mode also disables Secure Download Mode.
*
* @return
* - ESP_OK If the eFuse was successfully burned, or had already been burned.
* - ESP_ERR_INVALID_STATE ROM Download Mode has been disabled via eFuse, so Secure Download mode is unavailable.
*/
esp_err_t esp_efuse_enable_rom_secure_download_mode(void);
#endif
/* @brief Write random data to efuse key block write registers
*
* @note Caller is responsible for ensuring efuse