March 08, 2017
Before being able to write firmware data to any production Chromebook device, the Write-Protect screw has to be removed.
This post will look specifically at removing the WP screw from a Chell (HP Chromebook 13 G1) device, and verifying that it has been successfully removed.
To actually flash firmware to Chromebook machines, a device called a Servo is needed. While these devices aren't available publicly, they can be produced freely or possibly requested from Google if you are contributing code to the ChromiumOS project.
So this is what the WP screw looks like on a Chell Chromebook. This may or may not be what you will find in other devices. But if you take a close look, you will notice that the copper pad that the the screw attaches against is split into parts that are bridged by a screw being inserted.
# Go to your ChromiumOS checkout cd /opt/chromiumos # Enter dev environment cros_sdk # Set device variable export BOARD=chell # Connect to Chromebook using a Servo device sudo servod -b $BOARD & # Disable WP # This step may vary depending on the hardware of your actual Chromebook dut-control fw_wp:off sudo /usr/sbin/flashrom -p ft2232_spi:type=servo-v2 --wp-disable sudo /usr/sbin/flashrom -p ec --wp-disable
This post has been a part of work undertaken by my employer Collabora.
Our recent efforts on the Hantro kernel driver have resulted in the addition of H.264 decoding support and multiple performance improvements.…
Hwangsaeul, or H8L, a remote surveillance streaming solution, utilizes the capability of libsrt to collect statistics from open SRT sockets…
Complex, real-world correctness tests and performance analysis are now possible thanks to gltrim, a new tool recently added to apitrace,…
Earlier this week, WebRTC became an official W3C and IETF standard. GStreamer has a powerful and rapidly maturing WebRTC implementation.…
Last year, from June to September, I worked on the kernel development tool Coccinelle under Collabora. I implemented a performance boosting…
The open source Panfrost driver for Arm Mali Midgard and Bifrost GPUs now provides non-conformant OpenGL ES 3.0 on Bifrost and desktop OpenGL…