*

Quick hack: Setting up a ChromiumOS dev environment

Robert Foss avatar

Posted on 16/02/2017 by Robert Foss

How to set up a fully functional ChromiumOS development environment on actual Chromebook hardware.

Set up environment

export DEV_DIR="/opt"
mkdir -p $DEV_DIR
export CHROMIUM_DIR="$DEV_DIR/chromiumos"
mkdir -p $CHROMIUM_DIR
export PATH="$DEV_DIR/depot_tools:$PATH"
# The BOARD variable used here is specific for the Chromebook that is
# being targeted, a more generic target like "amd64-generic" could
# be more useful for you needs.
export BOARD=chell

# The USB_DEVICE variable refers to the USB device that will be used
# for flashing ChromiumOS onto a Chromebook.
# Make sure that this device does not contain anything important!
export USB_DEVICE="/dev/sda"

 

Install dependencies

sudo apt install git-core gitk git-gui subversion curl
cd $DEV_DIR
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git

 

Get ChromiumOS source

cd ${CHROMIUM_DIR}
repo init -u https://chromium.googlesource.com/chromiumos/manifest.git
repo sync -j25

 

Build ChromiumOS

cros_sdk -- ./build_packages --board=${BOARD}
cros_sdk -- ./build_image --board=${BOARD}

 

Flash ChromiumOS to storage medium

cros_sdk -- cros flash --board=${BOARD} usb:/$USB_DEVICE

 

Install ChromiumOS on Chromebook

Enter Chromebook into dev-mode

This part is highly device specific, and depends on how the manufacturer of your device has chosen to implement the dev-mode switch.

A partial list of devices and how to enter them into dev-mode can be found here.

Flash ChromiumOS to Chromebook

Fire up your Chrombook device and hit Ctrl+Alt+Back, followed by 'chronos' and hit enter. Followed by the below command to install the ChromiumOS build that was just flashed.

/usr/sbin/chromeos-install

 

Debug an application

On Chromebook

Again fire up your Chrombook device and hit Ctrl+Alt+Back, followed by 'chronos' and hit enter.

# Remount the root drive read / write
sudo mount -o remount,rw /

# Open port so that gdbserver can be reached
sudo /sbin/iptables -A INPUT  -p tcp --dport 1234 -j ACCEPT

# Run gdb server, listening on port 1234 (opened in iptables command above)
sudo gdbserver :1234 chrome


On dev machine

# On x86
cros_sdk -- sudo USE=expat emerge cross-i686-pc-linux-gnu/gdb
# On ARMv7
cros_sdk -- sudo USE=expat emerge cross-armv7a-cros-linux-gnueabi/gdb

cros_sdk -- i686-pc-linux-gnu-gdb "/build/$BOARD/opt/google/chrome/chrome"
(gdb) set sysroot /build/$BOARD/
(gdb) target remote IP_ADDR_CHROMEBOOK:1234
(gdb) continue

 

Conclusion

This is a bit of a rough outline, and is only suitable for Chromebook devices that already are in dev-mode.

Thanks!

This post has been a part of work undertaken by my employer Collabora.

References

ChromiumOS Depo Tools
ChromiumOS Quick Start
ChromiumOS Dev Mode
ChromiumOS Debug

Original post

Comments (0)


Add a Comment






Allowed tags: <b><i><br>Add a new comment:


Latest Blog Posts

Virtme: The kernel developers' best friend

18/09/2018

When working on the Linux Kernel, testing via QEMU is pretty common. Here's a look at virtme, a QEMU wrapper that uses the host instead…

Cambridge XMPP Sprint

30/08/2018

Earlier this month, Collabora sponsored & hosted the XMMP Sprint, the first developer event in the XMPP community in a long time. Here's…

Testing Chromebooks with LAVA on kernelci.org

29/08/2018

In addition to Collabora's work to add support in mainline Linux kernel for several Chromebooks, these platforms are now being continuously…

Quick hack: git reset upstream

27/08/2018

Working with a git based project that has a defacto upstream repository means that you perioducally want to fetch the canonical master branch.…

En route to a robust GPU device selection in GL

21/08/2018

A look at the work and motivation behind implementing the Khronos EGLDevice extensions in Mesa. These extensions allow users of open source…

Cross-compilation made easy for GNOME Builder

03/08/2018

GNOME Builder is an Integrated Development Environment designed for the GNOME ecosystem. It most notably features a deep integration to…

Open Since 2005 logo

We use cookies on this website to ensure that you get the best experience. By continuing to use this website you are consenting to the use of these cookies. To find out more please follow this link.

Collabora Ltd © 2005-2018. All rights reserved. Website sitemap.