starting with cargo (rust)

comprehensive rust/bare-metal
starting with cargo (rust)
Then : Cargo build
and
Then : Cargo run

OR
Embedded Rust

A recently discovered file on BBC Micro-bit:
# Behavior configuration file
# Reset can be hard or auto
# hard - user must disconnect power, press reset button or send a serial break command
# auto - upon programming completion the target MCU automatically resets
# and starts running
#
# The filename indicates how your board will reset the target
# Delete this file to toggle the behavior
# This setting can only be changed in maintenance mode