# work in a dedicated folder ( here in /tmp/, which is deleted when the operating system resets )

mkdir -p /tmp/smoothie/

# go there

cd /tmp/smoothie/

# retreive the source code from github ( see http://smoothieware.org/getting-smoothie ), in the current folder ( here /tmp/smoothie )

git clone git://github.com/Smoothieware/Smoothie.git

# move to the local copy of the repository

cd /tmp/smoothie/Smoothie/

# install the toolchain. Note you *must* us this specific toolchain, installed by this specific command. All alternatives are likely to cause issues.

./linux_install

# finally compile the firmware

make clean all

# we now have a firmware file

ls -lh LPC1768/main.bin

file LPC1768/main.bin

# copy that firmware file to the Smoothieboard's SD card via the mounted USB/Mass storage interface ( here we use a dummy folder in /tmp/ )
# the "mount" command can help you figure out where the smoothieboard is mounted

cp LPC1768/main.bin /tmp/mounted-media-storage-smoothieboard/firmware.bin

# now if we properly "eject" the Smoothieboard from the filesystem, and reset the smoothieboard, the new firmware will be flashed to ROM

umount /tmp/mounted-media-storage-smoothieboard/

# we get that error because we use a dummy folder for demonstration, but if you use the right path for your case, it will unmount the board
# you might need to run this with sudo

# the default firmware is for 3D printers. If you have a laser cutter or a CNC mill, you want the CNC build. It's easy, instead of doing «make clean all», you do:

make clean
make CNC=1

# and Voilà!
# Now *you* try it