where can I find elf file which is generated before program upload ? On Linux
Ok I think I have found it. Its under project folder
.pioenvs/megaatmega2560/firmware.elf
Yes, it will be under:
.pioenvs/ environment name /firmware.elf
(no spaces)
Environment name of course being whatever you have specified. In your case:
[env:megaatmega2560]
in your platformio.ini file