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+---
+title: ASUS Chromebook C201
+x-toc-enable: true
+...
+
+This is a Chromebook, using the Rockchip RK3288 SoC. It uses an ARM CPU,
+and has free EC firmware (unlike some other laptops). More RK3288-based
+laptops will be added to libreboot at a later date.
+
+Flashing instructions can be found at
+[../install/\#flashrom](../install/#flashrom)
+
+Google's intent with CrOS devices
+==================================
+
+CrOS (Chromium OS/Chrome OS) devices, such as Chromebooks, were not
+designed with the intent of bringing more freedom to users. However,
+they run with a lot of free software at the boot software and embedded
+controller levels, since free software gives Google enough flexibility
+to optimize various aspects such as boot time and most importantly, to
+implement the CrOS security system, that involves various aspects of the
+software. Google does hire a lot of Coreboot developers, who are
+generally friendly to the free software movement and try to be good
+members of the free software community, by contributing code back.
+
+CrOS devices are designed (from the factory) to actually coax the user
+into using proprietary web services (SaaSS) that invade the user's
+privacy (ChromeOS is literally just the Google Chrome browser when you
+boot up, itself proprietary and comes with proprietary add-ons like
+flash. It's only intended for SaaSS, not actual, real computing).
+Google is even a member of the *PRISM* program, as outlined by Edward
+Snowden. See notes about ChromeOS below. The libreboot project
+recommends that the user replace the default *ChromeOS* with a
+distribution that can be used in freedom, without invading the user's
+privacy.
+
+We also use a similar argument for the MacBook and the ThinkPads that
+are supported in libreboot. Those laptops are supported, in spite of
+Apple and Lenovo, companies which are actually *hostile* to the free
+software movement.
+
+Considerations about ChromeOS and free operating systems
+========================================================
+
+This laptop comes preinstalled (from the factory) with Google ChromeOS.
+This is a GNU+Linux distribution, but it's not general purpose and it
+comes with proprietary software. It's designed for SaaSS. Libreboot
+recommends that users of this laptop replace it with another
+distribution.
+
+Debian GNU+Linux
+----------------
+
+<https://wiki.debian.org/InstallingDebianOn/Asus/C201> shows how to
+install Debian.
+
+Devuan GNU+Linux
+----------------
+
+<https://notabug.org/dimkr/devsus> produces bootable and installable
+Devuan images.
+
+Parabola GNU+Linux
+------------------
+
+See:
+<https://lists.gnu.org/archive/html/libreboot/2015-12/msg00026.html>
+
+In this discussion thread (on the old GNU Libreboot mailing lists), there are
+instructions for installing Parabola on C201 and other rockchip chromebooks
+supported by Libreboot.
+
+Caution: Video acceleration requires a non-free blob, software rendering can be used instead.
+=============================================================================================
+
+The C201 has a Mali T GPU, which requires a non-free blob. A driver,
+Tamil, was written, but its source code has not been released. The
+developer has so-far [withheld
+it](http://libv.livejournal.com/27461.html). Use software rendering to
+avoid the blob instead. Most tasks can still be performed without video
+acceleration, without any noticeable performance penalty.
+
+In practise, this means that certain things like games, blender and
+GNOME shell (or other fancy desktops) won't work well. The libreboot
+project recommends a lightweight desktop which does not need video
+acceleration, such as *XFCE* or *LXDE*.
+
+As it is unlikely that Tamil will be released, the
+[chai](https://notabug.org/cafe/chai) project is writing a driver as
+well. Ask on IRC if you think you can contribute.
+
+Caution: WiFi requires a non-free blob, a USB dongle can be used instead.
+=========================================================================
+
+These laptops have non-removeable (soldered on) M.2 Type 1216 card
+with WiFi+Bluetooth, which requires non-free firmware to be loaded by
+the Linux kernel in order to work.
+
+The libreboot project recommends using an external USB wifi dongle that
+works with free software. See
+[\#recommended\_wifi](./#recommended_wifi).
+
+There are 2 companies (endorsed by Free Software Foundation, under their
+*Respects your Freedom* guidelines), that sell USB WiFi dongles
+guaranteed to work with free software (i.e. linux-libre kernel):
+
+- [ThinkPenguin sells
+ them](https://www.thinkpenguin.com/gnu-linux/penguin-wireless-n-usb-adapter-gnu-linux-tpe-n150usb)
+ (company based in USA)
+- [Tehnoetic sells
+ them](https://tehnoetic.com/tehnoetic-wireless-adapter-gnu-linux-libre-tet-n150)
+ (company based in Europe)
+
+These wifi dongles use the AR9271 (atheros) chipset, supported by the
+free *ath9k\_htc* driver in the Linux kernel. They work in *linux-libre*
+too.
+
+EC firmware is free software!
+=============================
+
+It's free software. Google provides the source. Build scripts will be
+added later, with EC sources provided in libreboot, and builds of the EC
+firmware.
+
+This is unlike the other current libreboot laptops (Intel based). In
+practise, you can (if you do without the video/wifi blobs, and replace
+ChromeOS with a distribution that respects your freedom) be more free
+when using one of these laptops.
+
+The libreboot FAQ briefly describes what an *EC* is:
+[../../faq.md#firmware-ec](../../faq.md#firmware-ec)
+
+No microcode!
+=============
+
+Unlike x86 (e.g. Intel/AMD) CPUs, ARM CPUs do not use microcode, not
+even built in. On the Intel/AMD based libreboot systems, there is still
+microcode in the CPU (not considered problematic by the FSF, provided
+that it is reasonably trusted to not be malicious, since it's part of
+the hardware and read-only), but we exclude microcode updates (volatile
+updates which are uploaded at boot time by the boot firmware, if
+present), which are proprietary software.
+
+On ARM CPUs, the instruction set is implemented in circuitry, without
+microcode.
+
+Depthcharge payload
+===================
+
+These systems do not use the GRUB payload. Instead, they use a payload
+called depthcharge, which is common on CrOS devices. This is free
+software, maintained by Google.
+
+Flash chip write protection: the screw
+======================================
+
+It's next to the flash chip. Unscrew it, and the flash chip is
+read-write. Screw it back in, and the flash chip is read-only. It's
+called the screw.
+
+*The screw* is accessible by removing other screws and gently prying off
+the upper shell, where the flash chip and the screw are then directly
+accessible. User flashing from software is possible, without having to
+externally re-flash, but the flash chip is SPI (SOIC-8 form factor) so
+you can also externally re-flash if you want to. In practise, you only
+need to externally re-flash if you brick the laptop; read
+[../install/bbb\_setup.md](../install/bbb_setup.md) for an example
+of how to set up an SPI programmer.
+
+Write protection is useful, because it prevents the firmware from being
+re-flashed by any malicious software that might become executed on your
+GNU+Linux system, as root. In other words, it can prevent a
+firmware-level *evil maid* attack. It's possible to write protect on
+all current libreboot systems, but CrOS devices make it easy. The screw
+is such a stupidly simple idea, which all designs should implement.
+
+Copyright © 2015, 2017 Leah Rowe <info@minifree.org>\
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License Version 1.3 or any later
+version published by the Free Software Foundation
+with no Invariant Sections, no Front Cover Texts, and no Back Cover Texts.
+A copy of this license is found in [../fdl-1.3.md](../fdl-1.3.md)