There is info in the make file for a 1MB ESP8266 board
https://github.com/espruino/Espruino/blob/2e0502cbb721c72fcae6807ac85edd9900b60a40/make/targets/ESP8266.make#L32
@MaBe started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
There is info in the make file for a 1MB ESP8266 board
https://github.com/espruino/Espruino/blob/2e0502cbb721c72fcae6807ac85edd9900b60a40/make/targets/ESP8266.make#L32