ESP32 Forum

We made our own ESP32-S3 board. When we first plug a USB TYPE C from Windows PC, It boots continiously. We used esptool.exe to load many bootloader.bin or similar file, but nothing changed. We still have bootloop problem.

The message in serial port is:

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x7 (TG0WDT_SYS_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40043ac8
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd0108,len:0x1634
load:0x403b6000,len:0xe74
load:0x403ba000,len:0x31c8
Checksum failure. Calculated 0x9f stored 0xde
ets_main.c 329
------(loops)------

How can we solve this problem?

ESP_Sprite, any answer to this serious problem?

Dunno. What have you already tested? Can you post your schematic? What SDK are you using?

Thank you for your interest.

The board is custom designed made by us. We have 8 MB of flash inside the ESP32-S3 (FN8 Model) chip. We also have 16 MB of flash (WINBOND W25Q128JVSIQ) on the board next to ESP32-S3.

Our problem is the bootloop. We use Arduino IDE 1.8.19. It loops continiously in the boot partition.

We have tested many ESP32-S3 board's bin files.
We have uploaded bootloader.bin, partition_table.bin, ota_data_initial.bin and tinyuf2.bin files mostly using esptool.exe on Windows CMD.EXE. Those 4 of *.bin files can be found inside this ZIP file:
https://github.com/adafruit/tinyuf2/rel ... 0.12.3.zip

Our partition table is attached.
Our schematic is attached.
The output from Serial Monitor of Arduino is attached (Serial Monitor COM39 Output.txt).

The -FN8 version of the ESP32S3 already has 8MiB of (octal-spi) flash inside; that's likely interfering with the flash you already installed. Desolder your external flash chip and everything will likely work.

Yeeeeesssssssss. This is it. 17 days!!! And finally we did it. Thank you very much ESP_Sprite. I really appreciate what you are doing. If you come to Istanbul, find me +90 5323918755.