[riot-notifications] [RIOT-OS/RIOT] Getting UART error in ESp32-wroom (#16249)

Gunar Schorcht notifications at github.com
Sun Apr 4 13:12:07 CEST 2021

The warning message is thrown if the flash mode is either `qout` or `qio`. In that case, the Quad SPI interface is used for SPI flash which in turn occupies GPIO 9 an GPIO 10 so that they can't be used as UART interface.

Could you check whether this is the case by using the the following command?
BOARD=esp32-wroom-32 make -C <your app directory> info-debug-variable-FLASH_MODE

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