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Take a look here: https://github.com/nodemcu/nodemcu-devkit-v1.0/blob/master/Documents/NODEMCU-DEVKIT-V1.0-INSTRUCTION-EN.pdf
The SPI on the left side (orange SDIO pins) is used to talk to the flash. The HSPI on the right side (bright green) can be used freely.
MarkusGritsch
@DrAzzy
Isn't the ESP8266's only SPI used for the EEPROM that holds the firmware though? Or does it have a second one?