I've made my own custom PCBA using the ATmega328-MMH (NOT ATmega328P) and was hoping to program and develop on this board using the Arduino IDE. The package type is the 28pin package, not 32 as on the Nano.
I'm having trouble finding any board support for this specific IC in Arduino - I only see support for the ATMega328P by selecting the Nano, and even then I'm expecting the device signatures to be different based on package and part number.
I intend to program/debug this board using either my Atmel-ICE (though it's currently not showing up as an available COM port device, will need to change the driver via Zadig I believe but that's a different issue), or with an Arduino Uno as ISP.
Am I screwed here? Is there no direct Arduino IDE support for this specific IC in this package?