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OpenWRT is a Linux operating system for embedded devices which allows the user to the customization of the device firmware as per the requirement of the user. It is an open-source project which supports 1200+ devices and has 3500+ packages.
In this lab, OpenWRT build system is provided to practice building custom OpenWRT firmware and kernel module.
Objective: Compile the firmware and kernel modules for a device of your choice.
Commands to create your own build setup
# Updating the packages
# Upgrading the packages
apt-get upgrade -y
# Installing the dependencies
apt-get install -y subversion g++ zlib1g-dev build-essential git python rsync man-db libncurses5-dev gawk gettext unzip file libssl-dev wget zip time git-core
# Adding a low privilege user john
adduser --disabled-password --gecos "" john
# Switching to user John
# Switching to home directory of user John
# Download a stable OpenWRT code release
# Unzip the archive
# Renaming the directory
mv openwrt-18.06.2 latest
# Changing to the directory
# Creating the initial configuration
# Creating the download directory
mkdir -p dl
# Updating the feeds
./scripts/feeds update -a
# Installing the feeds
./scripts/feeds install -a
# Creating the final config
# Cleaning the build system
# Downloading the required systems
# Building the firmware
Setting variables for kernel module compilation
# Locating staging directory of build system
# Adding binaries to PATH
# Pointing to Linux kernel code tree
# Setting alias for make with arguments for MIPS architecture
alias mipsmake='ARCH=mips CROSS_COMPILE=mips-openwrt-linux- make'
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