# `mix firmware`
[🔗](https://github.com/nerves-project/nerves/blob/v2.0.0-pre.2/lib/mix/tasks/firmware.ex#L11)

Build a firmware image for the selected target platform.

This is a convenience wrapper around `mix release`. The firmware image
is created as a release step, so `mix release` produces the same `.fw`
file when the project is configured with `Nerves.BuildAction` actions.

## Command line options

  * `--verbose` - produce detailed output about release assembly

## Environment variables

  * `NERVES_SYSTEM`    - may be set to a local directory to specify the Nerves
    system image that is used

  * `NERVES_TOOLCHAIN` - may be set to a local directory to specify the
    Nerves toolchain (C/C++ cross-compiler) that is used

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*Consult [api-reference.md](api-reference.md) for complete listing*