Error code E0775

#[cmse_nonsecure_entry] is only valid for targets with the TrustZone-M extension.

Erroneous code example:

#![allow(unused)]
#![feature(cmse_nonsecure_entry)]

fn main() {
#[cmse_nonsecure_entry]
pub extern "C" fn entry_function() {}
}

To fix this error, compile your code for a Rust target that supports the TrustZone-M extension. The current possible targets are:

• thumbv8m.main-none-eabi
• thumbv8m.main-none-eabihf
• thumbv8m.base-none-eabi