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...

Overall status - this will be a complete from-scratch build. For now, the board has a gentoo rootfs system, a custom gentoo amd64-cross-compiled u-boot, but an ubuntu-compiled armbian kernel and initrd. The kernel and initrd will be replaced with custom gentoo amd64-cross-compiled kernel, but that hasn't been tested yet.


Make/model Notes
Radxa ROCK Pi 4C+ dtb: rk3399-rock-pi-4c-plus.dtb
Rockchip RK3399-T datasheet

Trusted Firmware A (ATF)



(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]



  • Initial kernel = 6.1.55-current-rockchip64 aarch64
  • kernel 6.5.4 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

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


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/Cheating

Bootloader Build and Installation

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

Kernel Build and Installation

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

Install a Gentoo System "From Scratch"

By Hand

To "manually" build a linux system from scratch, see Radxa ROCK Pi 4C Plus/Build-Install-Kernel

With some automation...

To build a gentoo linux system with tools that automate many of the steps entailed in procedures described above, see Radxa ROCK Pi 4C Plus/Build-Install-joetoo

Binary Kernel/Firmware packages

To use pre-built binary packages for linux kernel, molules, dtbs, and bootloader, see Radxa ROCK Pi 4C Plus/Pre-built-binary-packages

Bootable gentoo system images

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

Issue 1

When X happens, Y is how you fix it.

See also

(Optional section.)

  • PINE64 ROCKPro64, The Rock 4C Plus SBC employs the same SoC as the PINE64 ROKCPro64, so the associated gentoo wiki article on that SBC may also be helpful, as it was inspiration for layout and content of this one.

External resources