The target is tier 1 now as per https://github.com/rust-lang/rust/issues/78251 , yet still listed as tier 2: https://rust-lang.github.io/rustup-components-history/aarch64-unknown-linux-gnu.html
The target is tier 1 now as per rust-lang/rust#78251 , yet still listed as tier 2: https://rust-lang.github.io/rustup-components-history/aarch64-unknown-linux-gnu.html