Anonymous 04/15/2018 (Sun) 16:51:53 No.12643 del
Running mainline kernel is now much easier.

https://archlinuxarm.org/platforms/armv8/rockchip/samsung-chromebook-plus

Mainline Kernel
The installation above will use the ChromeOS 4.4 kernel. The mainline kernel can be used instead, though some hardware may not be working yet.

Install linux-aarch64 packages, replacing the linux-gru package:
pacman -S linux-aarch64 linux-aarch64-chromebook
Type y and hit enter when prompted to flash the kernel to the kernel partition.
Reboot.