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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.
@tve
If you use the above 512KB firmware on a module with a flash chip that is larger you will see a warning about the flash chip config being incorrect when you reset Espruino. You can ignore the warning, it's just telling you that the configuration you chose (512KB) doesn't match you flash chip.
Also, the 512KB firmware will run with the flash chip configured to 40Mhz, while the flash chips larger than 512KB are (almost?) all capable of running at 80Mhz, so you will see some speed impact due to this (it's less than 2x, though). The complete flash instructions configure the flash chip to 80Mhz.