Samsung Chromebook Plus

The Samsung Chromebook Plus is a Rockchip RK3399 (ARMv8-A, Cortex-A72/A53) based 2 in 1 touchscreen laptop.

Hardware

	Make/model	Notes
Board	gru-kevin	filename of device tree binary: rk3399-gru-kevin.dtb
SoC	Rockchip RK3399	Branded as the "OP1" by Google
RAM	4GB	LPDDR3
Firmware	Coreboot with depthcharge payload	physical write protection (need to remove battery to disable as there is no cr50)
Boot media	Internal eMMC, USB or microSD

SoC

Component	Make/model	Status	Kernel driver(s)	Kernel version	Notes
CPU	2 x ARM Cortex-A72 (ARMv8-A) 4 x ARM Cortex-A53 (ARMv8-A)	Works		5.12
GPU	4 x Mali-T860MP4	?	panfrost	5.12
USB 3.0		Works		5.12	2 * USB-C

Peripherals

Component	Make/model	Status	Kernel driver(s)	Kernel version	Notes
Display	12.3" @ 2400x1600	Works		5.12
WiFi	Marvell 88W8997	Works	mwifiex	5.12	works with proprietary blobs
Touchpad		Works		5.12
Bluetooth		?

GCC Optimization

FILE /etc/portage/make.confRK3399 example

COMMON_FLAGS="-march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 -mfix-cortex-a53-835769 -mfix-cortex-a53-843419"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS}"

Note
For a hardened system consider appending -fstack-protector-all

Creating installation media

Create the installation media manually.

Installing Gentoo

Consult Samsung Chromebook Plus/Installing Gentoo for instructions on how to install Gentoo on the Samsung Chromebook Plus.

Built-in wifi

Built-in wifi requires the proprietary binary firmware blob 88W8997.bin, provided by sys-kernel/linux-firmware:

root #emerge --ask sys-kernel/linux-firmware

External resources

• https://github.com/SolidHal/PrawnOS
• https://archlinuxarm.org/platforms/armv8/rockchip/samsung-chromebook-plus