Do you want to work together on this?
I have code for doing the hex file (from my bootdrive project) but I'm wondering if it's worth the space. It's only a small simple command to convert it.
I was going to try to squeeze it down to either:
- get it out of the 4k bootloader zone (into at least the 2k zone)
- add back serial programming. The Optiboot code is very small and should be easy to integrate (I ported it into my bootdrive code)