esp_flash_write_protect_crypt_cnt() function

Write protect FLASH_CRYPT_CNT Intended to be called as a part of boot process if flash encryption is enabled but secure boot is not used. This should protect against serial re-flashing of an unauthorised code in absence of secure boot.

Syntax

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Summary

Declaration

Definition

from esp_flash_encrypt.h:152

void esp_flash_write_protect_crypt_cnt(void);

Implemented in flash_encrypt.c:109

Notes

On ESP32 V3 only, write protecting FLASH_CRYPT_CNT will also prevent disabling UART Download Mode. If both are wanted, call esp_efuse_disable_rom_download_mode() before calling this function.

References

Code

Location

void esp_flash_write_protect_crypt_cnt(void)

flash_encrypt.c:109

void esp_flash_write_protect_crypt_cnt(void);

esp_flash_encrypt.h:152

Call Tree

esp_flash_write_protect_crypt_cnt() calls 1 function:

esp_flash_write_protect_crypt_cnt()

esp_efuse_write_field_bit()

Data Use

esp_flash_write_protect_crypt_cnt() reads 1 variable:

ESP_EFUSE_WR_DIS_FLASH_CRYPT_CNT

esp_flash_write_protect_crypt_cnt()

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