Install Docker Community Edition from: https://www.docker.com/get-docker
Download firmware source code from KeepKey respository (https://github.com/keepkey/keepkey-firmware.git)
$ git clone git@github.com:keepkey/keepkey-firmware.git
Build the docker image for the toolchain:
$ cd keepkey-firmware && docker build -t keepkey/firmware:latest .
Build the debug version of the standard firmware:
$ docker_build_keepkey_debug.sh
Build the release version of the standard firmware:
$ docker_build_keepkey_release.sh
Build the debug version of the SALT-branded firmware:
$ docker_build_salt_debug.sh
Build the release version of the SALT-branded firmware:
$ docker_build_salt_release.sh
The resultant binaries will be located in the ./bin/{debug,release}/{keepkey,salt} directories as appropriate.
If license is not specified in the header of a file, it can be assumed that it is licensed under GPLv3.