README.md

Custom RootFS for Raspberry PI using Raspbian OS image file

⚠️ Important Note: This repository is a modified fork from kclyu/rpi_rootfs for building custom rootfs (sysroot) using a Raspbian OS image file that is compatible with https://github.com/abhiTronix/raspberry-pi-cross-compilers toolchains only. Thereby, offers no guarantee that it will work with any other toolchain.

A. Prerequisites

sudo apt update && sudo apt dist-upgrade
sudo apt-get install build-essential gawk gcc g++ gfortran git texinfo bison libncurses-dev tar wget qemu-user-static rsync rsync

B. Clone this Forked Repository:

git clone https://github.com/abhiTronix/rpi_rootfs.git

C. Making RootFS with Raspbian OS image file

Note 💡: Download the lite-image file from Raspberry PI download page and if possible, use the img file after unzipping the img.zip file after the download is complete.

cd ~/rpi_rootfs
sudo chmod +x ./build_rootfs.sh

# To build rootfs
./build_rootfs.sh create ./2021-MM-DD-raspios-buster-armhf.img

D. Bonus

PI.cmake

It is a CMAKE_TOOLCHAIN_FILE definition file for cmake used when cross compile using cmake:

⚠️ Remember to change toolchain path and compiled rootfs path in PI.cmake before running cmake!!!

⚠️ Always keep provided CMakeLists.txt file with PI.cmake!!!

cd  cmake_source_distribution_root_path
mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=~/rpi_rootfs/PI.cmake  -DCMAKE_BUILD_TYPE=Debug ..

sysroot-relativelinks.py

A python script that takes a sysroot directory and turn all the abolute symlinks and turn them into relative ones such that the sysroot is usable within another system.

sysroot-relativelinks.py path_to_sysroot_directory