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Merge branch 'feature/secure_set_efuses_to_prevent_brick_chip' into 'master'

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security: write-protect DIS_ICAHE and DIS_DCACHE

Closes IDF-5177

See merge request espressif/esp-idf!22640
This commit is contained in:
Mahavir Jain
2023-03-29 11:51:09 +08:00
parent 79b92b8576 a3232e4a5b
commit f22daec784
37 changed files with 251 additions and 27 deletions
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10
components/bootloader_support/src/esp32s2/flash_encryption_secure_features.c
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@@ -47,5 +47,15 @@ esp_err_t esp_flash_encryption_enable_secure_features(void)
esp_efuse_write_field_bit(ESP_EFUSE_WR_DIS_RD_DIS);
#endif
#ifndef CONFIG_SECURE_FLASH_SKIP_WRITE_PROTECTION_CACHE
// Set write-protection for DIS_ICACHE and DIS_DCACHE to prevent bricking chip in case it will be set accidentally.
// esp32s2 has DIS_ICACHE and DIS_DCACHE. Write-protection bit = 2 for both.
// List of eFuses with the same write protection bit:
// DIS_ICACHE, DIS_DCACHE, DIS_DOWNLOAD_ICACHE, DIS_DOWNLOAD_DCACHE,
// DIS_FORCE_DOWNLOAD, DIS_USB, DIS_TWAI, DIS_BOOT_REMAP, SOFT_DIS_JTAG,
// HARD_DIS_JTAG, DIS_DOWNLOAD_MANUAL_ENCRYPT.
esp_efuse_write_field_bit(ESP_EFUSE_WR_DIS_DIS_ICACHE);
#endif
return ESP_OK;
}