JerryScript for OpenWrt build guide

This document describes the steps required to compile the JerryScript for OpenWrt. For target device the TP-Link WR1043ND v1.x router is used. Please be advised, that if you have a different one minor modifications to this document could be required.

IMPORTANT!

As the TP-Link WR1043ND is a mips based device and mips is a big-endian architecture a JerryScript snapshot which was built on an little-endian system will not work correctly. Thus it is advised that the snapshot functionally should be used with caution, that is DO NOT run snapshots generated on little-endian system(s) on a big-endian system.

OpenWrt notes

In 2018 ~January the OpenWrt and LEDE project merged into one and thus the old OpenWrt parts are now usable only from an archived repository: https://github.com/openwrt/archive

OpenWrt toolchain setup

To build the JerryScript for OpenWrt a toolchain is required for the target router/device. The toolchain setup in this document was tested on an Ubuntu 16.04.3 LTS Linux.

Steps required for toolchain creation:

0. Install OpenWrt build requirements

$ sudo apt-get install git-core build-essential libssl-dev libncurses5-dev unzip gawk zlib1g-dev subversion mercurial

1. Clone OpenWrt (Chaos Calmer version)

$ git clone https://github.com/openwrt/archive openwrt -b chaos_calmer
$ cd openwrt

2. Run Menuconfig and configure the OpenWrt

$ make menuconfig

Options which should be set:

Set "Target System" to "Atheros AR7xxx/AR9xxx".
Set "Target Profile" to "TP-LINK TL-WR1043N/ND".

Save the configuration (as .config) and exit from the menuconfig.

3. Configure the environment variables

$ export BUILDROOT=$(pwd) # where the openwrt root dir is
$ export STAGING_DIR=${BUILDROOT}/staging_dir/ # required by the compiler
$ export PATH=$PATH:${STAGING_DIR}/host/bin:${STAGING_DIR}/toolchain-mips_34kc_gcc-4.8-linaro_uClibc-0.9.33.2/bin/

The name toolchain-mips_34kc_gcc-4.8-linaro_uClibc-0.9.33.2 is created based on the menuconfig. This changes depending on the target device!

4. Build the OpenWrt

$ make

5. Check if the compiler was built

$ mips-openwrt-linux-gcc --version # running this should print out the version information

At this point we have the required compiler for OpenWrt.

Build JerryScript for OpenWrt

0. Check environment

Please check if the STAGING_DIR is configured correctly and that the toolchain binary is on the PATH.

1. Run the build with the OpenWrt toolchain file

$ ./tools/build.py --toolchain cmake/toolchain_openwrt_mips.cmake \
                   --lto OFF

2. Copy the binary

After a successful build the build/bin/jerry binary file can be copied to the target device. On how to copy a binary file to an OpenWrt target device please see the OpenWrt manual(s).