User:Brendlefly62/Radxa ROCK Pi 4C Plus

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Construction of this page began 27 September 2023 (Work in Progress)

This is an inexpensive arm64 board...

* There are evidently both "rk3399-rock-4c-plus" AND "rk3399-rock-pi-4c-plus" devices (or at least .dtb files for both) - but the difference is not clear
  • The product investigated below was delivered in packaging labeled ROCK 4C Plus, but trial-and-error revealed that its wifi (brcmfmac) works only using the "rk3399-rock-pi-4c-plus.dtb" device tree file
  • This product's wifi (brcmfmac) does NOT work when using the rk3399-rock-rc-plus.dtb device tree file

Overall status - this will be a complete from-scratch build. So far, the board has a gentoo rootfs system, a custom gentoo amd64-cross-compiled u-boot, and it has been transitioned from an initial ubuntu-compiled armbian kernel and initrd to a custom gentoo gcc-compiled kernel built from upstream sources ( using "rockchip-sources" (a custom ebuild is available in the "joetoo" repository -- The kernel was built on a gentoo amd64-cross-compiling desktop workstation, using the author's custom "kernelupdate-embedded" script, also available via ebuild at the link above.

"Rock 4c Plus packaging, annotated board layout"



Make/model Notes
Board Radxa ROCK Pi 4C+ dtb: rk3399-rock-pi-4c-plus.dtb
SoC Rockchip RK3399-T datasheet
Firmware U-Boot rk3399_u-boot-2023.07.02 (cross-compiled by user on Gentoo AMD64 desktop PC)
Trusted Firmware A (ATF) rk3399-atf-2.9.0 (cross-compiled by user on Gentoo AMD64 desktop PC)
Boot media SD card eMMC not present but supported by u-boot standard. PXE not tested but supported by u-boot standard. USB boot option exists in u-boot documentation, but it was not tested (and there may be issues with that).[1][2]


The hardware is tested on kernel version 6.1.55-current-rockchip64 (ARM64). The 6.5.4 kernel has been built, but has not been tested yet.
Device Make/model Status kernel drivers Notes
CPU 64bits hexa core processor Rockchip RK3399-T

4 x Cortex-72, freq 1.5GHz

2 x Cortex-A53, freq 1.0GHz

GPU 4 x Mali T860MP4 gpu, support OpenGL ES 1.1/2.0/3.0/3.1/3.2, Vulkan 1.0, Open CL 1.1 1.2, DX11. Works
Memory LPDDR4 4GB 64bit dual channel LPDDR4@3200Mb/s Works
Storage eMMC connector

μSD card (μSD slot supports up to 256 GB μSD card)

Works eMMC not present
Display One Micro HDMI 2K up to 1440P@60

One Micro HDMI 4K 2.0 up to 4k@60 MIPI DSI 4 lanes via FPC connector Only two of HDMI 2k, HDMI 4K and MIPI DSI can work at the same time.

Works Display video is present at boot on the right of 2 HDMI ports
Audio 3.5mm jack HD codec that supports up to 24-bit/96KHz audio. Not tested
Camera MIPI CSI 2 lanes via FPC connector, support up to 800 MP camera (0.3mm pitch connector). Not tested
Wireless 802.11 ac wifi

BT 5.0 with external antenna

Works WiFi works w brcmfmac, wpa_supplicant. BT not tested
USB USB 3.0 OTG X1, upper one, software configurable to be host or OTG,

USB 3.0 HOST X1, dedicated USB 3.0 channel, lower one USB 2.0 HOST X2

Ethernet GbE LAN with Power over Ethernet (PoE) support

additional HAT is required for powering from PoE

IO 40-pin expansion header

2 x UART 2 x SPI bus 3 x I2C bus 1 x PCM/I2S 1 x SPDIF 2 x PWM 1 x ADC 6 x GPIO 2 x 5V DC power in 2 x 3.3V DC power in

Others RTC Not tested
Power USB C 5V/3A Works


  • Standard (shipped in starter kit): case, heat sinks, fan, and power supply.
  • Keyboard, mouse, micro-HDMI cable, and FTDIboard-with-miniUSB cable provided separately by the user


Component Make/model Status Kernel driver(s) Kernel version Notes
PMIC Rockchip RK808 Works rk808 5.10 Power Management Integrated Circuit (Regulators, RTC, Clocking)[3][4]
Ethernet PHY Realtek RTL8211F Works realtek_phy 5.10 via RGMII
Analog Audio  ? es8316, audio_graph_card 5.10

GCC optimization[5]

ARM errata 835769 and 843419 affect Cortex-A53 up to r0p4 and Linux kernel recommends working around the latter though states nothing about the former.
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"
For a hardened system consider appending -fstack-protector-all

Gentoo Installation Options and Procedures

Getting to Know the Board

The purpose of this guide is to document "from scratch" procedures for installing a pure gentoo system on this SBC. However the quicker way to get gentoo up and running is to install another distribution, and replace the root file system contents. See User:Brendlefly62/Radxa ROCK Pi 4C Plus/Getting to Know the Board

Bootloader Build and Installation

To build a U-Boot bootloader from sources, see User:Brendlefly62/Radxa ROCK Pi 4C Plus/Build-Install-U-Boot

Assemble a Working Gentoo System

To assemble a working Gentoo system with minimal effort, using resources developed above, consult User:Brendlefly62/Radxa ROCK Pi 4C Plus/Assemble a Gentoo System

Kernel Build and Installation

To build a gentoo linux kernel (including modules, device tree blobs, etc) from sources, see User:Brendlefly62/Radxa ROCK Pi 4C Plus/Build-Install-Kernel

Install a Gentoo System "From Scratch"

To install Gentoo from scratch on this board, consult User:Brendlefly62/Radxa ROCK Pi 4C Plus/Gentoo From Scratch

Bootable gentoo system images

To use pre-built bootable system images files, see User:Brendlefly62/Radxa ROCK Pi 4C Plus/Bootable-System-Images

See also

  • PINE64 ROCKPro64 — the Radxa ROCK 4C+ SBC employs the same SoC as the PINE64 ROKCPro64, so the associated article on that SBC may also be helpful.

External resources