I wanted a optiboot for ATmega8 (with external oscillator) at 8MHz and serial port to 38400 but was not able to compile the project with WinAVR,
I instead found one ready for ATmega8 8 MHz 57600, okay to try it, it works, but I found that when using my pre-programmed application provoked by a watchdog reset (I press a combination of keys on the keyboard) does not understand avrdudess never the bootloader, but if provoked an external reset understand it, so I can not use it, sorry because occupies very little space, you can re-enter the bootloader after a WD reset?