Bootloader problem

twiereng
Posts: 2
Joined: Thu Jan 10, 2019 8:07 pm

Bootloader problem

Postby twiereng » Thu Jan 10, 2019 8:11 pm

Greetings,

Looks like I've damaged my bootloader on ESP32. How can I re-install the bootloader?

Thanks, Theron Wierenga

ESP_igrr
Posts: 1305
Joined: Tue Dec 01, 2015 8:37 am

Re: Bootloader problem

Postby ESP_igrr » Fri Jan 11, 2019 1:41 am

Hi Theron, ESP32 contains a bootloader in mask ROM which can not be damaged or rewritten. Therefore running 'make flash' to program the application (such as a hello_world example) should always succeed. The only case this may not succeed is if some of the Efuses related to flash encryption, secure boot, or SPI flash pins have been burned (programmed). If you can try running 'make flash' for the hello_world example, and post any error output you get, then we can troubleshoot this further.

twiereng
Posts: 2
Joined: Thu Jan 10, 2019 8:07 pm

Re: Bootloader problem

Postby twiereng » Fri Jan 11, 2019 2:08 am

Found my problem, I had pin 12 held high.

12 (MTDI) If driven High, flash voltage (VDD_SDIO) is 1.8V not default 3.3V. Has internal pull-down, so unconnected = Low = 3.3V. May prevent flashing and/or booting if 3.3V flash is used and this pin is pulled high, causing the flash to brownout. See the ESP32 datasheet for more details.

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