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efuse: Validates data after burning and re-burnes it if necessary

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This commit is contained in:
Konstantin Kondrashov
2022-04-27 01:10:41 +08:00
parent 1f0e27ca63
commit df30b362a8
25 changed files with 721 additions and 127 deletions
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81
components/efuse/esp32c3/esp_efuse_utility.c
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@@ -69,8 +69,9 @@ void esp_efuse_utility_clear_program_registers(void)
}
// Burn values written to the efuse write registers
void esp_efuse_utility_burn_chip(void)
esp_err_t esp_efuse_utility_burn_chip(void)
{
esp_err_t error = ESP_OK;
#ifdef CONFIG_EFUSE_VIRTUAL
ESP_LOGW(TAG, "Virtual efuses enabled: Not really burning eFuses");
for (int num_block = EFUSE_BLK_MAX - 1; num_block >= EFUSE_BLK0; num_block--) {
@@ -82,30 +83,90 @@ void esp_efuse_utility_burn_chip(void)
#ifdef CONFIG_EFUSE_VIRTUAL_KEEP_IN_FLASH
esp_efuse_utility_write_efuses_to_flash();
#endif
#else
#else // CONFIG_EFUSE_VIRTUAL
if (esp_efuse_set_timing() != ESP_OK) {
ESP_LOGE(TAG, "Efuse fields are not burnt");
} else {
// Permanently update values written to the efuse write registers
// It is necessary to process blocks in the order from MAX-> EFUSE_BLK0, because EFUSE_BLK0 has protection bits for other blocks.
for (int num_block = EFUSE_BLK_MAX - 1; num_block >= EFUSE_BLK0; num_block--) {
bool need_burn_block = false;
for (uint32_t addr_wr_block = range_write_addr_blocks[num_block].start; addr_wr_block <= range_write_addr_blocks[num_block].end; addr_wr_block += 4) {
if (REG_READ(addr_wr_block) != 0) {
if (esp_efuse_get_coding_scheme(num_block) == EFUSE_CODING_SCHEME_RS) {
uint8_t block_rs[12];
efuse_hal_rs_calculate((void *)range_write_addr_blocks[num_block].start, block_rs);
memcpy((void *)EFUSE_PGM_CHECK_VALUE0_REG, block_rs, sizeof(block_rs));
}
int data_len = (range_write_addr_blocks[num_block].end - range_write_addr_blocks[num_block].start) + sizeof(uint32_t);
memcpy((void *)EFUSE_PGM_DATA0_REG, (void *)range_write_addr_blocks[num_block].start, data_len);
efuse_hal_program(num_block);
need_burn_block = true;
break;
}
}
if (!need_burn_block) {
continue;
}
if (error) {
// It is done for a use case: BLOCK2 (Flash encryption key) could have an error (incorrect written data)
// in this case we can not burn any data into BLOCK0 because it might set read/write protections of BLOCK2.
ESP_LOGE(TAG, "BLOCK%d can not be burned because a previous block got an error, skipped.", num_block);
continue;
}
efuse_hal_clear_program_registers();
if (esp_efuse_get_coding_scheme(num_block) == EFUSE_CODING_SCHEME_RS) {
uint8_t block_rs[12];
efuse_hal_rs_calculate((void *)range_write_addr_blocks[num_block].start, block_rs);
memcpy((void *)EFUSE_PGM_CHECK_VALUE0_REG, block_rs, sizeof(block_rs));
}
unsigned r_data_len = (range_read_addr_blocks[num_block].end - range_read_addr_blocks[num_block].start) + sizeof(uint32_t);
unsigned data_len = (range_write_addr_blocks[num_block].end - range_write_addr_blocks[num_block].start) + sizeof(uint32_t);
memcpy((void *)EFUSE_PGM_DATA0_REG, (void *)range_write_addr_blocks[num_block].start, data_len);
uint32_t backup_write_data[8 + 3]; // 8 words are data and 3 words are RS coding data
memcpy(backup_write_data, (void *)EFUSE_PGM_DATA0_REG, sizeof(backup_write_data));
int repeat_burn_op = 1;
bool correct_written_data;
bool coding_error_before = efuse_hal_is_coding_error_in_block(num_block);
if (coding_error_before) {
ESP_LOGW(TAG, "BLOCK%d already has a coding error", num_block);
}
bool coding_error_occurred;
do {
ESP_LOGI(TAG, "BURN BLOCK%d", num_block);
efuse_hal_program(num_block); // BURN a block
bool coding_error_after;
for (unsigned i = 0; i < 5; i++) {
efuse_hal_read();
coding_error_after = efuse_hal_is_coding_error_in_block(num_block);
if (coding_error_after == true) {
break;
}
}
coding_error_occurred = (coding_error_before != coding_error_after) && coding_error_before == false;
if (coding_error_occurred) {
ESP_LOGW(TAG, "BLOCK%d got a coding error", num_block);
}
correct_written_data = esp_efuse_utility_is_correct_written_data(num_block, r_data_len);
if (!correct_written_data || coding_error_occurred) {
ESP_LOGW(TAG, "BLOCK%d: next retry to fix an error [%d/3]...", num_block, repeat_burn_op);
memcpy((void *)EFUSE_PGM_DATA0_REG, (void *)backup_write_data, sizeof(backup_write_data));
}
} while ((!correct_written_data || coding_error_occurred) && repeat_burn_op++ < 3);
if (coding_error_occurred) {
ESP_LOGW(TAG, "Coding error was not fixed");
if (num_block == 0) {
ESP_LOGE(TAG, "BLOCK0 got a coding error, which might be critical for security");
error = ESP_FAIL;
}
}
if (!correct_written_data) {
ESP_LOGE(TAG, "Written data are incorrect");
error = ESP_FAIL;
}
}
}
#endif // CONFIG_EFUSE_VIRTUAL
esp_efuse_utility_reset();
return error;
}
// After esp_efuse_write.. functions EFUSE_BLKx_WDATAx_REG were filled is not coded values.