I don’t think Espressif will help once the module has been put in a device/board. They’ve probably just direct you back to the supplier.

Anyway, let’s just confirm we don’t have another issue causing this (either corrupt firmware, or power issues):

Please power the device either from a powered USB hub, or from 12V. Best to also disconnect the modem board if you can. Then:

… --flash_mode dio --flash_freq 40m --flash_size detect 0x1000 <BOOTLOADER> 0x10000 <BIN> 0x8000 <PARTITIONS>

Reboot without a SD card in the slot and show me the output.

Also, please give the output of:

$ ~/esp/esp-idf/components/esptool_py/esptool/espefuse.py … summary

$ ~/esp/esp-idf/components/esptool_py/esptool/espefuse.py … dump

Regards, Mark.

On 8 Aug 2018, at 2:05 PM, Henrik Scheel <henrik.scheel@spjeldager.dk> wrote:

My OVMS v3.1 module is failing to boot due to e-fuse CRC error.

I am trying to open a support ticket at https://www.espressif.com/en/company/contact-extra/technical-inquiries-hardware.

First I had to confirm that I had done 76 advanced checks, ensuring that the hardware design is correct.

Then I have to fill in a form, requesting information like:
Name
Work email
Job Position
Country
Company
Website
Project Name
Customer Product Part Number
Design Version
Espressif Product
SDK Version
And PCB layout

So I guess I am using the wrong form.

How do I contact Espressif regarding the e-fuse problem?

Best regards,
Henrik

--

Venlig hilsen / best regards
Henrik R. Scheel

Spjeldager Consult ApS
Spjeldager 9
DK-2630 Taastrup
CVR: 34491399
T: +45 2720 9828
http://www.spjeldager.dk/

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