ESP8266 EFUSE Settings

WheresWally
Posts: 3
Joined: Sun May 14, 2017 11:57 pm

ESP8266 EFUSE Settings

Postby WheresWally » Wed May 17, 2017 4:31 pm

Hi, could someone that knows please explain what EFUSE setting are?

I have 2 modules that always Boot-Loop-Exception(0) forever.
Are these parts recoverable or are they doomed?
When I use the Download Flasher V2.4 it shows the following.

ESP8266 #1
bit[1:0] error
===================
CRC IN MODE1:
crc_val_res: 100
target crc val: 100
========================
CRC IN MODE1:
crc_val_res: 233
target crc val: 233
========================
efuse warning found...

EFUSE LOG:
REG0:D4E90001
REG1:4200D107
REG2:6400b000
REG3:005CCF7F
===================
EFUSE NORMAL MODE
===================
EFUSE VAL ERROR...
EFUSE VAL WARNING...



ESP8266 #2
bit79:76 error
bit[1:0] error
bit[59:56] error
===============
CRC IN MODE1:
crc_val_res: 248
target crc val: 163
=================
bit[47:24] crc warning
efuse warning found...

EFUSE LOG:
REG0:FFA300FF
REG1:FFEFD7F0
REG2:feffffff
REG3:07FFFFFF
===================
EFUSE NORMAL MODE
===================
EFUSE VAL ERROR...
EFUSE VAL WARNING...

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pratik
Posts: 383
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Location: India
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Re: ESP8266 EFUSE Settings

Postby pratik » Thu May 18, 2017 12:29 pm

The eFuse settings for ESP8266 are not publicly documented for some reasons. But eFuse is a one-time-programmable memory.
Using a third party flash download tool may sometimes cause issues if it writes incorrect values to the fuse bits.
You should start off with new modules, I don't think eFuse errors can be resolved - they are OTP for security reasons.
Regards,
Pratik Panda
Website: http://www.PratikPanda.com

Custom firmware, Knowledge base and freelancing (ESP8266/ESP32):
http://www.iot-bits.com

WheresWally
Posts: 3
Joined: Sun May 14, 2017 11:57 pm

Re: ESP8266 EFUSE Settings

Postby WheresWally » Thu May 18, 2017 6:54 pm

Yes pratik, I think that is the case. I have found more information on the ESP32 and that is the case with the ESP32, well some of them at least.
I assume the hint is in the name,"FUSE".
One time writable registers.
Thanks

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