ESP32-D0WDQ6 Factory Firmware/Bootloader or is it Empty?

[Bunshee]

Hello!

I designed a own board, with a new ESP32-D0WDQ6 Chip, and a W25Q128JV SPI Flash.
Now my Question is, is there a Factory Bootloader on the ESP32 Chip or is the chip complete empty?

How must i start it?

thanks,
daniel

[Bunshee]

Hello,

Okay, i tested a little bit, tricky is, connecting to the ESP32 without DSR + RTS.... but it works...
The Wiring for the Flash is 1:1 to the ESP32-WROOM....

The JTAG Pins are unconnected, i wrote the eFuse for SDIO to 3.3V (Off), now has the flash 3.3V....

When i boot up i become this error:

[Codebox]rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)<\r><\n>
flash read err, 1000<\r><\n>
ets_main.c 371 <\r><\n>
[/Codebox]

the ESP32 flash tool says me:
[Codebox]
flash vendor:
00h : N/A
flash devID:
0000h
N/A;N/A
crystal:
40 Mhz
[/Codebox]

i want to flash the AT Firmware for the ESP32, but it failes with a Flash Timeout..??

[lbernstone]

There is a bootloader. You can set the bootloader to download by strapping gpio0 to ground. Use an IDE or the bootloader utility (https://github.com/espressif/esptool) to upload your firmware.