I successfully compiled the current MicroPython firmware on a MacBook with the help of the tutorial by Adafruit
https://learn.adafruit.com/building-and ... d-firmware. Note: You although need to run the following code in the MicroPython git repo, as mentioned by syrekron:
After flashing the ESP-01 everything worked as expected. My question is, if it is possible in the current state of MicroPython for ESP8266 to run a python script per default at startup without compiling it into the firmware (as described by the Adafruit tutorial).