Summary
The espefuse.py summary command reads the eFuses from the chip and outputs them in text or json format. It is also possible to save it to a file. The command also supports eFuse filtering by name.
Optional arguments:
--format- Select the summary format:summary- text format (default option).json- json format. Usage--format json.value_only- only the value of the eFuse specified as an argument will be displayed. For more information, refer to the Filtering eFuses section.
--file- File to save the efuse summary. Usage--file efuses.json.List of eFuses to filter. For more information, refer to the Filtering eFuses section.
Text Format Summary
The text format of summary consists of 3 main columns:
This column consists of the eFuse name and additional information: the block name associated with this eFuse field and encoding errors (if any).
Description of eFuse field.
This column has human readable value, read/write protection status, raw value (hexadecimal or binary).
Read and Write Protection Status
The R/W output indicates a protection status of a specific eFuse field/block:
-/Windicates that read protection is set. Value of such eFuse field will always show all-zeroes, even though hardware may use the correct value. In espefuse v2.6 and newer, read-protected eFuse values are displayed as question marks (??). On earlier versions, they are displayed as zeroes.BLOCK1 (BLOCK1): = ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? -/W
R/-indicates that write protection is set. No further bits can be set.-/-means both read and write protection are set.
Some eFuses have no protection at all, and some eFuses have only one read or write protection. There is no mark in the summary to expose it.
Display Efuse Summary
The eFuse summary may vary from version to version of this tool and differ for different chips. Below is the summary for the ESP32-H2 chip.
For details on the meaning of each eFuse value, refer to the Technical Reference Manual.
> espefuse.py -p PORT summary
Connecting....
Detecting chip type... ESP32-H2
=== Run "summary" command ===
EFUSE_NAME (Block) Description = [Meaningful Value] [Readable/Writeable] (Hex Value)
----------------------------------------------------------------------------------------
Config fuses:
WR_DIS (BLOCK0) Disable programming of individual eFuses = 0 R/W (0x00000000)
RD_DIS (BLOCK0) Disable reading from BlOCK4-10 = 0 R/W (0b0000000)
DIS_ICACHE (BLOCK0) Represents whether icache is disabled or enabled. = False R/W (0b0)
1: disabled. 0: enabled
POWERGLITCH_EN (BLOCK0) Represents whether power glitch function is enable = False R/W (0b0)
d. 1: enabled. 0: disabled
DIS_TWAI (BLOCK0) Represents whether TWAI function is disabled or en = False R/W (0b0)
abled. 1: disabled. 0: enabled
DIS_DIRECT_BOOT (BLOCK0) Represents whether direct boot mode is disabled or = False R/W (0b0)
enabled. 1: disabled. 0: enabled
UART_PRINT_CONTROL (BLOCK0) Set the default UARTboot message output mode = Enable R/W (0b00)
HYS_EN_PAD0 (BLOCK0) Set bits to enable hysteresis function of PAD0~5 = 0 R/W (0b000000)
HYS_EN_PAD1 (BLOCK0) Set bits to enable hysteresis function of PAD6~27 = 0 R/W (0b0000000000000000000000)
BLOCK_USR_DATA (BLOCK3) User data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_SYS_DATA2 (BLOCK10) System data part 2 (reserved)
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
Flash fuses:
FLASH_TPUW (BLOCK0) Represents the flash waiting time after power-up; = 0 R/W (0x0)
in unit of ms. When the value less than 15; the wa
iting time is the programmed value. Otherwise; the
waiting time is 2 times the programmed value
FORCE_SEND_RESUME (BLOCK0) Represents whether ROM code is forced to send a re = False R/W (0b0)
sume command during SPI boot. 1: forced. 0:not for
ced
FLASH_CAP (BLOCK1) = 0 R/W (0b000)
FLASH_TEMP (BLOCK1) = 0 R/W (0b00)
FLASH_VENDOR (BLOCK1) = 0 R/W (0b000)
Identity fuses:
WAFER_VERSION_MINOR (BLOCK1) = 0 R/W (0b000)
WAFER_VERSION_MAJOR (BLOCK1) = 0 R/W (0b00)
DISABLE_WAFER_VERSION_MAJOR (BLOCK1) Disables check of wafer version major = False R/W (0b0)
PKG_VERSION (BLOCK1) Package version = 0 R/W (0b000)
OPTIONAL_UNIQUE_ID (BLOCK2) Optional unique 128-bit ID
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLK_VERSION_MINOR (BLOCK2) BLK_VERSION_MINOR of BLOCK2 = 0 R/W (0b000)
BLK_VERSION_MAJOR (BLOCK2) BLK_VERSION_MAJOR of BLOCK2 = 0 R/W (0b00)
DISABLE_BLK_VERSION_MAJOR (BLOCK2) Disables check of blk version major = False R/W (0b0)
Jtag fuses:
JTAG_SEL_ENABLE (BLOCK0) Set this bit to enable selection between usb_to_jt = False R/W (0b0)
ag and pad_to_jtag through strapping gpio25 when b
oth EFUSE_DIS_PAD_JTAG and EFUSE_DIS_USB_JTAG are
equal to 0
SOFT_DIS_JTAG (BLOCK0) Represents whether JTAG is disabled in soft way. O = 0 R/W (0b000)
dd number: disabled. Even number: enabled
DIS_PAD_JTAG (BLOCK0) Represents whether JTAG is disabled in the hard wa = False R/W (0b0)
y(permanently). 1: disabled. 0: enabled
Mac fuses:
MAC (BLOCK1) MAC address
= 60:55:f9:f7:2c:05 (OK) R/W
MAC_EXT (BLOCK1) Stores the extended bits of MAC address = ff:fe (OK) R/W
CUSTOM_MAC (BLOCK3) Custom MAC
= 00:00:00:00:00:00 (OK) R/W
Security fuses:
DIS_FORCE_DOWNLOAD (BLOCK0) Represents whether the function that forces chip i = False R/W (0b0)
nto download mode is disabled or enabled. 1: disab
led. 0: enabled
SPI_DOWNLOAD_MSPI_DIS (BLOCK0) Represents whether SPI0 controller during boot_mod = False R/W (0b0)
e_download is disabled or enabled. 1: disabled. 0:
enabled
DIS_DOWNLOAD_MANUAL_ENCRYPT (BLOCK0) Represents whether flash encrypt function is disab = False R/W (0b0)
led or enabled(except in SPI boot mode). 1: disabl
ed. 0: enabled
SPI_BOOT_CRYPT_CNT (BLOCK0) Enables flash encryption when 1 or 3 bits are set = Disable R/W (0b000)
and disables otherwise
SECURE_BOOT_KEY_REVOKE0 (BLOCK0) Revoke 1st secure boot key = False R/W (0b0)
SECURE_BOOT_KEY_REVOKE1 (BLOCK0) Revoke 2nd secure boot key = False R/W (0b0)
SECURE_BOOT_KEY_REVOKE2 (BLOCK0) Revoke 3rd secure boot key = False R/W (0b0)
KEY_PURPOSE_0 (BLOCK0) Represents the purpose of Key0 = USER R/W (0x0)
KEY_PURPOSE_1 (BLOCK0) Represents the purpose of Key1 = USER R/W (0x0)
KEY_PURPOSE_2 (BLOCK0) Represents the purpose of Key2 = USER R/W (0x0)
KEY_PURPOSE_3 (BLOCK0) Represents the purpose of Key3 = USER R/W (0x0)
KEY_PURPOSE_4 (BLOCK0) Represents the purpose of Key4 = USER R/W (0x0)
KEY_PURPOSE_5 (BLOCK0) Represents the purpose of Key5 = USER R/W (0x0)
SEC_DPA_LEVEL (BLOCK0) Represents the spa secure level by configuring the = 0 R/W (0b00)
clock random divide mode
ECDSA_FORCE_USE_HARDWARE_K (BLOCK0) Represents whether hardware random number k is for = False R/W (0b0)
ced used in ESDCA. 1: force used. 0: not force use
d
CRYPT_DPA_ENABLE (BLOCK0) Represents whether anti-dpa attack is enabled. 1:e = False R/W (0b0)
nabled. 0: disabled
SECURE_BOOT_EN (BLOCK0) Represents whether secure boot is enabled or disab = False R/W (0b0)
led. 1: enabled. 0: disabled
SECURE_BOOT_AGGRESSIVE_REVOKE (BLOCK0) Represents whether revoking aggressive secure boot = False R/W (0b0)
is enabled or disabled. 1: enabled. 0: disabled
DIS_DOWNLOAD_MODE (BLOCK0) Represents whether Download mode is disabled or en = False R/W (0b0)
abled. 1: disabled. 0: enabled
ENABLE_SECURITY_DOWNLOAD (BLOCK0) Represents whether security download is enabled or = False R/W (0b0)
disabled. 1: enabled. 0: disabled
SECURE_VERSION (BLOCK0) Represents the version used by ESP-IDF anti-rollba = 0 R/W (0x0000)
ck feature
SECURE_BOOT_DISABLE_FAST_WAKE (BLOCK0) Represents whether FAST VERIFY ON WAKE is disabled = False R/W (0b0)
or enabled when Secure Boot is enabled. 1: disabl
ed. 0: enabled
BLOCK_KEY0 (BLOCK4)
Purpose: USER
Key0 or user data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY1 (BLOCK5)
Purpose: USER
Key1 or user data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY2 (BLOCK6)
Purpose: USER
Key2 or user data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY3 (BLOCK7)
Purpose: USER
Key3 or user data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY4 (BLOCK8)
Purpose: USER
Key4 or user data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK_KEY5 (BLOCK9)
Purpose: USER
Key5 or user data
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
Usb fuses:
DIS_USB_JTAG (BLOCK0) Represents whether the function of usb switch to j = False R/W (0b0)
tag is disabled or enabled. 1: disabled. 0: enable
d
USB_EXCHG_PINS (BLOCK0) Represents whether the D+ and D- pins is exchanged = False R/W (0b0)
. 1: exchanged. 0: not exchanged
DIS_USB_SERIAL_JTAG_ROM_PRINT (BLOCK0) Set this bit to disable USB-Serial-JTAG print duri = False R/W (0b0)
ng rom boot
DIS_USB_SERIAL_JTAG_DOWNLOAD_MODE (BLOCK0) Represents whether the USB-Serial-JTAG download fu = False R/W (0b0)
nction is disabled or enabled. 1: disabled. 0: ena
bled
Vdd fuses:
VDD_SPI_AS_GPIO (BLOCK0) Represents whether vdd spi pin is functioned as gp = False R/W (0b0)
io. 1: functioned. 0: not functioned
Wdt fuses:
WDT_DELAY_SEL (BLOCK0) Represents whether RTC watchdog timeout threshold = 0 R/W (0b00)
is selected at startup. 1: selected. 0: not select
ed
Json Format Summary
The json representation of eFuses for the ESP32 chip is shown below.
> espefuse.py summary --format json
{
"ABS_DONE_0": {
"bit_len": 1,
"block": 0,
"category": "security",
"description": "Secure boot V1 is enabled for bootloader image",
"efuse_type": "bool",
"name": "ABS_DONE_0",
"pos": 4,
"readable": true,
"value": false,
"word": 6,
"writeable": true
},
"BLOCK1": {
"bit_len": 256,
"block": 1,
"category": "security",
"description": "Flash encryption key",
"efuse_type": "bytes:32",
"name": "BLOCK1",
"pos": 0,
"readable": true,
"value": "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00",
"word": 0,
"writeable": true
},
...
"CODING_SCHEME": {
"bit_len": 2,
"block": 0,
"category": "efuse",
"description": "Efuse variable block length scheme",
"efuse_type": "uint:2",
"name": "CODING_SCHEME",
"pos": 0,
"readable": true,
"value": "NONE (BLK1-3 len=256 bits)",
"word": 6,
"writeable": true
},
....
}
Save Json Format Summary To File
> espefuse.py summary --format json --file efuses.json
Connecting..........
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting....
Detecting chip type... ESP32
=== Run "summary" command ===
Saving efuse values to efuses.json
Filtering Efuses and Displaying Only the Value
The espefuse.py summary command supports filtering eFuses by name. The eFuses to filter needs to be specified as positional arguments. If no eFuses are specified, complete summary will be displayed. Example:
> espefuse.py summary ABS_DONE_0 BLOCK1
=== Run "summary" command ===
EFUSE_NAME (Block) Description = [Meaningful Value] [Readable/Writeable] (Hex Value)
----------------------------------------------------------------------------------------
Security fuses:
ABS_DONE_0 (BLOCK0) Secure boot V1 is enabled for bootloader image = False R/W (0b0)
BLOCK1 (BLOCK1) Flash encryption key
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
If --format value_only is specified, only the value of the eFuse specified as an argument will be displayed. Only one eFuse can be specified as an argument for this format. Example:
> espefuse.py summary --format value_only MAC
=== Run "summary" command ===
00:00:00:00:00:00 (CRC 0x00 OK)