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README.md

Setup

VM setup

VirtualBox is the preferred virtualizer, although any other virtualizer that can provided shared folders and port forwarding will also work. Docker might be considered as a replacement in the future.

Debian 9 Stretch is the distro of choice.

Prerequsites:

  • Insert Guest Additions CD image
# Initial dependencies
sudo apt-get install curl

# rustup
curl https://sh.rustup.rs -sSf > rustup.sh
chmod +x rustup.sh
./rustup.sh -y
rm rustup.sh

# For ARMv7 support
rustup target add armv7-unknown-linux-gnueabihf

# Add Raspberry Pi 3 arch
sudo dpkg --add-architecture armhf
sudo apt-get update

# Cross-compile dependencies
sudo apt-get install -y build-essential crossbuild-essential-armhf

# Guest additions build dependencies
sudo apt-get install -y module-assistant dkms

# Prepare system to build kernel modules
sudo m-a prepare

# Mount Guest additions CD and build
sudo mount /dev/sr0 /mnt
cd /mnt
sudo ./VBoxLinuxAdditions.run

# Allow current user to access shared folders
sudo adduser "$USER" vboxsf

# Reboot
sudo reboot

SSH keys are recommended.

Cross-compiling

The included Makefile cross-compiles the project on the Linux VM and transfers it onto a target system (ARMv6/ARMv7 hard-float based). Environment variables are used for configuration.

Environment Variables

  • TARGET_ADDRESS
    Address of machine that the compiled binary should be deployed on.
    Example: pigeon.local
  • TARGET_BIN_LOCATION
    Target location of the deployed binary.
    Example: '~'
  • TARGET_USER
    Username on target system.
    Example: philip
  • VM_PORT
    SSH port of cross-compile VM.
    Example: 2222
  • VM_PROJECT_LOCATION
    Shared project folder location.
    Example: /media/sf_9000d
  • VM_USER
    Username on cross-compile VM.
    Example: philip
  • CONFIGURATION
    Defaults to debug, set to release for optimized builds.
    Example: release
  • TARGET
    Defaults to armv7, set to arm for ARMv6 builds.
    Example: arm

Run python3 util/generate_env.sh to generate a .env file containing these variables. Use something like autoenv to automatically run this file.

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