Bluebie is developing µBoot, a tiny USB bootloader that only consumes 2.1 Kilobytes of flash on an ATtiny85. It’s based on USBaspLoader-tiny85 bootloader but loses ~0.7KB by customizing it’s functionality.
µBoot is a tiny bootloader for attiny85 chips. Weighing in at just under 2.1kb it leaves more free space to uploaded programs than any other usb bootloader I know of. I made it over this past weekend and it’s coming along quite nicely, already useful for some types of projects.
Via the forum.