Acer Chromebook C720

Article description::A short guide containing relevant instructions to get Gentoo running on a Acer C720.

Developer mode
In order get lower-level access to the hardware to install Gentoo, it is necessary to put the system into developer mode.

Follow these steps to gain access to developer mode:


 * 1) Reboot the system to the login screen, then do not login.
 * 2) At the login screen hold + (the  key) then press the Power button (top right).
 * 3) The machine should boot to a special recovery screen, when it gets there press +. The system will reboot.

Enable the legacy bootloader

 * 1) Presuming the system in a a powered down state, power up the unit.
 * 2) When the login screen appears, hold + and press. This should enter the developer console.
 * 3) Login by entering   at the prompt, and pressing the  key.
 * 4)  to gain a  shell.
 * 5) Type  and then press.
 * 6) The system will reboot again.
 * 1) The system will reboot again.

Loading bootable media
After downloading a 64-bit minimal installation CD, proceed to make it USB drive bootable with. Copy the image to a USB drive with :




 * 1) Once the dd process is complete, insert the USB to a USB port on the Chromebook.
 * 2) If the Chromebook was powered down or waiting at the legacy bootload screen, restart the Chromebook by pressing the power button.
 * 3) At the recovery screen, press + to load legacy boot options.
 * 4) The SeaBIOS bootloader should appear prompting a press of the  key. Press.
 * 5) Select the appropriate bootable device by pressing the associated integer number on the keyboard.
 * 6) The Gentoo ISO Linux prompt should appear. Press  to boot the minimal CD.
 * If the init process gets stuck, try adding  to the kernel command-line parameters.

Once the init process completes the system is ready to receive a Gentoo install!

Create a backup of the current OS
It may be a good idea to create a backup of the Chromebook's installation on embedded flash disk (typically ) before proceeding. If the Chromebook may be transferred to a new owner one day, the backup of the original OS could be restored. After configuring networking and enabling the SSH daemon, something like the following command should suffice:

This will send the entire contents of over the network to the current running directory. Be sure there's enough free space in the current partition to receive the file!

To restore the backup, boot the Gentoo minimal install CD again (or alternative live media) and issue:

Installation
For installation instructions follow the MBR disk partitioning path in the AMD64 Handbook.

External resources

 * https://www.chromium.org/chromium-os/developer-information-for-chrome-os-devices/acer-c720-chromebook - A very informative chromium projects page contains information about the Acer C720, C720P and C740 chromebook models.


 * https://www.linux.com/learn/how-install-linux-acer-c720-chromebook - A Linux.com article on installing Ubuntu/Bodhi Linux.