You are right, thank you for your replies!

I was referring to the datasheet, in particular Table 6 and the following:

"ESP32-C3 features three SPI interfaces (SPI0, SPI1, and SPI2). SPI0 and SPI1 can be configured to operate in
SPI memory mode, while SPI2 can be configured to operate in general-purpose SPI modes."

Pins from 19-24 are ...

Yes, I'm using the ESP32-C3 SoC without any embedded Flash.

jocic@jocic-VivoBook-15-ASUS-Laptop-X540MA-A543MA:~/blink-test$ idf.py -p /dev/ttyUSB0 flash
Executing action: flash
Running ninja in directory /home/jocic/blink-test/build
Executing "ninja flash"...
[1/5] cd /home/jocic/blink-test/build ...

Hello there,

I have recently designed and made my first test board around the ESP32-C3 SoC - which is a SoC that has no embedded Flash memory.

For the external memory I have chosen to use ZB25D40BTIG - 4M Nor Flash Memory, an equivalent to the GD25Q40C from GigaDevice which seems to be on the list ...