Cargo Features

[dependencies]
ambiq-hal-sys = { version = "0.1.0", default-features = false, features = ["sparkfun-redboard", "sparkfun-redboard-nano"] }
default = sparkfun-redboard

The sparkfun-redboard feature is set by default whenever ambiq-hal-sys is added without default-features = false somewhere in the dependency tree.

sparkfun-redboard default
sparkfun-redboard-nano

ambiq-hal-sys has 3 features without comments.