i have an Arduino Uno clone lying around and thought that i'd give it a quick spin with Rust and [avr-hal](https://github.com/Rahix/avr-hal/tree/main). while it works fine out of the box (nice!) i'm not too happy about having to use nightly rust (either stuck on an old "known to work" nightly build or randomly hitting issues).
from what i see at a first glance the reason for nightly rust is not in `avr-hal` itself but in the target (named `avr-atmega328p` in the repo in my case) not being an official rust target and lack of pre-compiled `core` for the target? the repo also ships with [specs for various MCUs](https://github.com/Rahix/avr-hal/tree/main/avr-specs) while the [official rust target list](https://doc.rust-lang.org/rustc/platform-support.html) only lists `avr-unknown-gnu-atmega328` (btw: why `gnu` and not `none`? i'd have expected this to be a bare-metal target?)
are there any plans to add AVR targets to rust as tier 3 (so that the specs are no longer needed) and eventually tier 2 (so that `core` is pre-built and nightly rust is no longer needed)?