Add the following URL to the Arduino Boards Manager (File->Preferences):
https://github.com/watterott/ATmega328PB-Testing/raw/master/package_m328pb_index.json
and install the ATmega328PB Boards via the Boards Manager (Tools->Boards->Boards Manager).
The current Arduino avr-gcc toolchain (4.8.1) does not support the ATmega328PB.
To get support you can replace it with the below avr-gcc toolchain (4.9.2 from Atmel or Arduino) and update the files in /arduino/hardware with the files from this repository under hardware.
Atmel Toolchain (GCC 4.9.2)
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Linux: Download x86, Download x64, Infos
Arduino Toolchain (GCC 4.9.2)
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Linux: Download x86, Download x64, Infos
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Another project/guide for the ATmega328PB: https://hackaday.io/project/9313-uino-mini-super-atmega328pb
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Discussion in the Italian Arduino Forum: http://forum.arduino.cc/index.php?topic=374642.0
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Differences between ATmega328/P and ATmega328PB: http://www.atmel.com/Images/Atmel-42559-Differences-between-ATmega328P-and-ATmega328PB_Application%20Note_AT15007.pdf
- Patch v1.0.1 - Astrobeed, gpb01, PaoloP
- avr-gcc 4.9.2 for linux64 - sabas1080
- All Pull Requests...