Cargo Features

EEPROM has no features set by default.

[dependencies]
eeprom = { version = "0.3.1", features = ["stm32f103"] }
stm32f103 = stm32f1xx-hal

Enables stm32f1xx-hal ^0.9.0

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

stm32f1xx-hal stm32f103?

Enables stm32f1xx-hal ^0.9.0