656 + 9 bytes

Hi !

656 + 9 bytes is the smallest program size (setup(){} loop(){})

Is that the usb bootloader ?

thx

(Mega 2560)

Which board do you have selected?

Is that the usb bootloader ?

No, it is the size of the hidden main() function which includes a call to the hidden init() function as well as setup() and loop()

...and crt0.