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Optiboot is a bootloader. You can use it to upload your project to a bugone using the serial link instead of the AVR ISP. optiboot consume 512bytes of flash memory.


to install optiboot, you need an AVR ISP. Go to the project/optiboot and compile it using make. change the fuse to boot to the bootloader after a reset :

      avrdude -c usbasp -p atmega168 -V -U efuse:w:0x04:m

upload the bootloader using make load. It will erase all the flash space.


plug in power and serial link. make an external reset by short circuit pin 3 and 6 of the isp connector. LED1 will blink 3 times. Then you have 8 seconds to upload your code. Use this command :

      avrdude -c arduino -P /dev/ttyUSB0 -p atmega168 -b 38400 (-V)

You can use make sload to load your code in the bugOne, if you already have the bootloader enable.


  • you can only read or write flash memory. No fuses or eeprom
  • you can modify eeprom using a project whose sole purpose is to write a value to eeprom
  • you can't change the bootloader using the bootloader. You have to use an isp
bugone/optiboot.txt · Last modified: 2014/01/26 17:15 by nicolasdupeux
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