• Install rake:

sudo apt-get install rake

• Install prerequisites

sudo apt-get install gcc-arm-none-eabi gcc-avr avr-libc git subversion unzip

• Download REM buildsystem

mkdir rem_build
cd rem_build
git clone https://github.com/franzflasch/REM.git

• Prepare test project

git clone https://github.com/franzflasch/rem_packages.git
git clone https://github.com/franzflasch/rem_test_project.git

• Prepare PATH

cd REM
export PATH=`pwd`:$PATH
cd ..

• Start Build
• Atmega168

rem ARCH=avr MACH=atmega168 PROJECT_FOLDER="rem_packages rem_test_project" -m -j4 package:test_project:image[hex]

• STM32

rem ARCH=arm MACH=stm32f3 PROJECT_FOLDER="rem_packages rem_test_project" -m -j4 package:test_project:image[bin]

The image will end up in rem_workdir/#{arch}_#{machine}/deploy It will be either a binary or hex image, depending on what you've chosen to build. The arguments "-m -j4" mean to build with max 4 threads simultaneously. After the successful build you can flash the image with an appropriate tool for your microcontroller.