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Building on Debian (Buster)

Prepare the development environment

Create a directory for the development environment and cd in to it.

mkdir ~/pebble-dev
cd ~/pebble-dev

Install Dependencies

This will install curl, python, node, gawk and a couple of required libraries

sudo apt install -y curl
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt install -y nodejs python-pip python3-pip python2.7-dev python-gevent gawk libsdl1.2debian libfdt1 libpixman-1-0

We're also going to need a cross compiler

wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q4/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
tar jxf gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
rm gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2

cd gcc-arm-none-eabi-10-2020-q4-major
sudo cp -R * /usr/
cd ~/pebble-dev
rm -rf gcc-arm-none-eabi-10-2020-q4-major

To make sure the cross compiler is working run

arm-none-eabi-gcc --version

The output should look like:

arm-none-eabi-gcc (GNU Arm Embedded Toolchain 10-2020-q4-major) 10.2.1 20201103 (release)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

PebbleSDK

Download and extract the pebble sdk.

wget https://developer.rebble.io/s3.amazonaws.com/assets.getpebble.com/pebble-tool/pebble-sdk-4.5-linux64.tar.bz2
tar -jxf pebble-sdk-4.5-linux64.tar.bz2
rm pebble-sdk-4.5-linux64.tar.bz2

Add the PebbleSDK binaries to PATH and apply the change.

echo 'export PATH=~/pebble-dev/pebble-sdk-4.5-linux64/bin:$PATH' >> ~/.profile
. ~/.profile

Install virtualenv.

sudo pip3 install virtualenv

Install PebbleSDK.

cd ~/pebble-dev/pebble-sdk-4.5-linux64
virtualenv --python=python2.7 .env
source .env/bin/activate
pip install -r requirements.txt
deactivate

Deactivate PebbleSDK analytics tracking.

mkdir -p ~/.pebble-sdk
touch ~/.pebble-sdk/NO_TRACKING

Install the PebbleSDK core.

pebble sdk install https://github.com/aveao/PebbleArchive/raw/master/SDKCores/sdk-core-4.3.tar.bz2

To test if everything was successful, you can run:

pebble ping --emulator aplite

NOTE: The emulator requires an active X server.

RebbleOS

Navigate back to our development environment.

cd ~/pebble-dev

Make sure git is installed.

sudo apt install -y git

Clone the RebbleOS repository, and install its dependencies.

git clone https://github.com/pebble-dev/RebbleOS.git
cd RebbleOS
git submodule update --init --recursive

Create a Resources folder.

mkdir Resources

At this point, you will need to visit the Discord to download the FPGA files and put them in the Resources folder. Which can be found in the #firmware channel in the Pins.

Copy additional resources from the PebbleSDK using a utility script.

./Utilities/mk_resources.sh ~/.pebble-sdk/SDKs/4.3/sdk-core/pebble

Now we need to make a small change to lib/tz/Makefile to use gawk instead of awk

Open the file in your favorite text editor and find the code that says:

# The name of a Posix-compliant 'awk' on your system.
# Older 'mawk' versions, such as the 'mawk' in Ubuntu 16.04, might dump core;
# on Ubuntu you can work around this with
#       AWK=            gawk
AWK=            awk

Change AWK=awk to AWK=gawk (the whitespace in between is not important, you can leave it or remove it). Save and exit the editor

It should now be ready to compile and run in the emulator

cd ~/pebble-dev/RebbleOS
make snowy_qemu

If anything fails, or if you have any questions, feel free to hit us up in Discord!