![]() ![]() This is theoretically a safer approach than flashing the full firmware but there might be some limitations (e.g. This method replaces the stock ChromeOS payload (depthcharge) with SeaBIOS. Flash the BOOT_STUB part of the firmware.Flash a full custom firmware which includes either a SeaBIOS or UEFI payload, and removes all the ChromeOS-specific parts.The easiest way to install/update the RW_LEGACY firmware on your ChromeOS device is via MrChromebox's Firmware Utility Script, which supports the widest range of devices and offers the most up-to-date SeaBIOS builds one can also update the RW_LEGACY firmware manually with Chrome OS' flashrom (requires downloading/compiling your own build), or use John Lewis' flash_chromebook_rom.sh script (no longer supported). This is 100% safe, as it writes to a user-writeable area of the firmware image which is completely separate from/does not affect ChromeOS. If the device supports Legacy Boot Mode, but does not ship with a functional RW_LEGACY payload (or does not ship with one at all), one can flash a SeaBIOS payload to the RW_LEGACY part of the firmware.One of the following approaches can be taken in order to install Arch Linux on Chrome OS devices which did not ship with SeaBIOS as part of the installed firmware: These models require a 3rd party RW_LEGACY firmware to be loaded for Legacy Boot Mode to be functional. Models with an Atom-based SoC (Baytrail, Braswell, Apollolake) have Legacy Boot Mode capability, but do not ship with a RW_LEGACY/SeaBIOS payload (that part of the firmware is blank). ![]() Models with a Core-i based SoC (Haswell, Broadwell, Skylake, KabyLake) mostly ship with a functional Legacy Boot Mode payload updating to a 3rd party build can provide bug fixes and additional features. SeaBIOS behaves like a traditional BIOS that boots into the MBR of the disk, and from there into standard boot loaders like Syslinux and GRUB. It is enabled by the SeaBIOS payload of coreboot, the open-source firmware used for all Chrome OS devices (with the exception of the first generation of Chromebooks and a few early ARM models). Legacy Boot Mode has a dedicated firmware region, RW_LEGACY, which is designed to be user-writeable (hence the 'RW' notation) and is completely separate from the ChromeOS portion of the firmware (ie, it is safe to update and cannot brick the device). For instructions on how to install Arch Linux in a ChromeOS container without having to enable developer mode see Crostini Introduction Legacy Boot ModeĪll recent Intel-based Chrome OS devices (starting with the 2013 Chromebook Pixel) feature a Legacy Boot Mode, designed to allow the user to boot Linux. ![]() We need to select the start point of the SEC GTP table.Note: This article describes how to install Arch Linux by activating developer mode. We need to know where to create the second partition. Look for the number under the start column for Sec GPT table which is 15633375 in this example: ![]() To create the rootfs partition, we first need to calculate how big to make the partition using information from cgpt show. Create an empty GTP partition table writing gĬgpt add -i 1 -t kernel -b 8192 -s 32768 -l Kernel -S 1 -T 5 -P 10 /dev/$DEVICE$ You need to change this for your selection. We can do the install into a usb device (sdX) or into a SD card (mmcblk1). ![]()
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