That's the RTC register; you use that at runtime. The eFuse name is EFUSE_UART_PRINT_CONTROL.


Thanks after burn the Booting Message is silence.
C:\Users\MyUserName\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\4.9.dev3\espefuse.exe --chip esp32s3 --port COM7 burn_efuse UART_PRINT ...

You need to look into the ESP32-S3 TRM on section 8.3 ROM Messages Printing Control
https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf#bootctrl
some eFuses need to be set for print to be disabled


I tried
>C:\Users\MyUserName\AppData\Local ...

Show us which output. Before when I've seen this conversation, it was firmware/IDF/Arduino chatter that was being emitted the boot rom was indeed silent.


There's a flag you can use to compile the ESP-IDF chatter down for warnings and errors. It's turning CORE_something to zero. If you can't find ...

I'm developing ESP32-S3 but I cannot suppress booting message like ESP32 v1 for pulldown resistor at GPIO15
I also tried pulldown resister 10k on GPIO45, GPIO46 but Serial0 keep sending message. Other GPIO are using for other job so i cannot change other GPIO.
I'm using Arduino IDE v2.x.x
Because I ...

Hi! I'm using Arduino IDE v2.3.3 - ESP32 Dev Module - esp32 by Espressif Systems v3.0.7
my board did NOT run until I sent something to Serial then it start booting and run normal.
i need help auto run please! Thanks

here booting info that i got

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH ...

I tried pull-down GPIO15 with 10k resistor. Booting message was disabled.
Serial.Print() function is still working fine.
Problem is solved.

I'm connecting 3x esp32 devkit1 together.
Serial1 and other pins already is used for other work. Serial0 connecting together via RS485. But every time boot esp32 sent booting message sometime make other esp32 hang.
I searched on forum: pull-down GPIO15 can disable booting message but also disable ...