Build the build environment

This chapter introduces the compilation environment of the Linux SDK


(1) It is recommended to develop in the Ubuntu 18.04 system environment. If other system versions are used, the compilation environment may need to be adjusted accordingly.

(2) Compile with ordinary user, do not compile with root user authority.

Download Firefly_Linux_SDK

First prepare an empty folder to place SDK, better under home, here we use ~/proj as example.

Attention: To avoid unnecessary errors, please do not place/unzip the SDK in VM shared folders or non-english directories.

Get SDK needs:

sudo apt update
sudo apt install -y repo git python
  • Method One

Download via repo, you can choose to get full SDK or BSP:

mkdir ~/proj/rk356x_linux_release_v1.3.0b_20221213/
cd ~/proj/rk356x_linux_release_v1.3.0b_20221213/

## Full SDK
repo init --no-clone-bundle --repo-url --no-repo-verify -u -b master -m rk356x_linux_release.xml

## BSP (Only include some basic repositories and compile tools)
## BSP includes device/rockchip, docs, kernel, u-boot, rkbin, tools and cross-compile toolchian
repo init --no-clone-bundle --repo-url --no-repo-verify -u -b master -m rk356x_linux_bsp_release.xml
  • Method Two

Download Firefly_Linux_SDK sub-volume compressed package: Firefly_Linux_SDK Source

After downloading, verify the MD5 code:

$ md5sum rk356x_linux_release_v1.3.0b_20221213_split_dir/*firefly_split*
409b81a9ed3bb9a7d6af91223836cad5  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file00
75cef82f2bf91052a7d3c6f0b8405a89  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file01
6f20f62e9652f8f999692587a2ac4b79  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file02
113acbbcd18d3abe0552ef296e983a3f  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file03
624c88a4da2eaa4a48f380783b126d00  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file04
1cf861afb0b36c9ebcf26a7d6effb260  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file05
3009e46fc14481e77fe7ec143e217de4  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file06
5e1cc90b99e34f20b75fb506d3e9bcd7  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file07
1a512fa7c9e2fd1a0781f8d40e228402  rk356x_linux_release_v1.3.0b_20221213_split_dir/rk356x_linux_release_v1.3.0b_20221213_firefly_split.file08

After confirming that it is correct, you can unzip:

# unzip
mkdir ~/proj/
cd ~/proj/
cat path/to/rk356x_linux_release_v1.3.0b_20221213_split_dir/*firefly_split* | tar -xzv

# export data
.repo/repo/repo sync -l

Sync Code

Execute the following command to synchronize the code:

# Enter the SDK root directory
cd ~/proj/rk356x_linux_release_v1.3.0b_20221213/

# Sync
.repo/repo/repo sync -c --no-tags
.repo/repo/repo start firefly --all

You can use the following command to update the SDK later:

.repo/repo/repo sync -c --no-tags


├── app
├── buildroot														# Buildroot root filesystem build directory
├── -> device/rockchip/common/					# Compile script
├── debian															# Debian root filesystem compilation directory
├── device															# Compile related configuration files
├── docs															# Documentation
├── -> buildroot/build/
├── external
├── kernel															# Kernel
├── Makefile -> buildroot/build/Makefile
├── -> device/rockchip/common/	# Link script
├── prebuilts														# Cross compilation toolchain
├── rkbin
├── -> device/rockchip/common/				# Flash script
├── tools															# Tools directory
└── u-boot															# U-Boot

Install dependencies

  • Method 1:

Install directly on PC:

sudo apt-get install repo git ssh make gcc libssl-dev liblz4-tool \
expect g++ patchelf chrpath gawk texinfo chrpath diffstat binfmt-support \
qemu-user-static live-build bison flex fakeroot cmake \
unzip device-tree-compiler python-pip ncurses-dev python-pyelftools
  • Method 2: Use Docker

Use dockerfile to create a container, build SDK in the container, it will perfectly solve environment problems and isolate with host environments.

First install docker in the host PC, you can refer to Docker instructions

Create an empty folder as docker work dir, like ~/docker/, then touch a dockerfile with contents:

FROM ubuntu:18.04
MAINTAINER firefly ""

ENV DEBIAN_FRONTEND=noninteractive

RUN apt update

RUN apt install -y build-essential crossbuild-essential-arm64 \
	bash-completion vim sudo locales time rsync bc python

RUN apt install -y repo git ssh libssl-dev liblz4-tool lib32stdc++6 \
	expect patchelf chrpath gawk texinfo diffstat binfmt-support \
	qemu-user-static live-build bison flex fakeroot cmake \
	unzip device-tree-compiler python-pip ncurses-dev python-pyelftools \
	subversion asciidoc w3m dblatex graphviz python-matplotlib cpio \
	libparse-yapp-perl default-jre patchutils swig expect-dev u-boot-tools

RUN apt update && apt install -y -f

# language support
RUN locale-gen en_US.UTF-8

# switch to a no-root user
RUN useradd -c 'firefly user' -m -d /home/firefly -s /bin/bash firefly
RUN sed -i -e '/\%sudo/ c \%sudo ALL=(ALL) NOPASSWD: ALL' /etc/sudoers
RUN usermod -a -G sudo firefly

USER firefly
WORKDIR /home/firefly

Create image

cd ~/docker
docker build -t sdkcompiler .
# sdkcompiler is image name, you can change it, notice that there's a '.' at the end of cmd
# This process takes a while, please wait

Then create a container

# Here we mount host SDK location into the container, so that you can access SDK inside container
# source= is host SDK location; target= is a folder inside container, must be an empty folder
# ubuntu18 is container name, firefly is container's hostname, you can change them
# sdkcompiler is the image created in last step
docker run --privileged --mount type=bind,source=/home/fierfly/proj,target=/home/firefly/proj --name="ubuntu18" -h firefly -it sdkcompiler

Now you can build SDK inside the container.

How to quit container and how to reopen:

# Execute "exit" inside container will quit and close it

# See all containers (include exited ones)
docker ps -a

# Start an exited container and attach it
docker start ubuntu18 # container name
docker attach ubuntu18