Hello,
I tried to install DietPi on the board by using the provided script at first, met some problems but ultimately succeeded with the help of DietPi’s dev . Now the board is on the 6.12 kernel, but only one of the Ethernet port works :
Full story here : Rock 3B’s road to DietPi
Now I’m trying to backport the drivers / dtb from Radxa to the latest firmware / Kernel , do you guys have a way to do that ? I’m willing to dig in this 
Boot your board and OS using mainline U-Boot built for ROCK 3B and both Ethernet ports should work using mainline Linux. Both ports worked when I added initial support for ROCK 3B in mainline Linux and U-Boot.
That is called technical support, not development. They download Armbian, brand to Dietpi and sell it to you. When problems goes up, they sent you here or to Armbian. Bad open source practice.
I’ll try to do that. How did you do it ?
dev = developer … There’s work done behind DietPi. They don’t support the board to begin with.
No one sent me here I’m just covering all the bases since the Discord is a pain to use.
I’m here because Radxa images are not up to date. " Bad open source practice "
I don’t think so, at least not hardware related. AFAIK they only apply branding to Armbian images. Which you can build on your own at any moment Getting Started - Armbian Documentation This is the reason why up-to-date exists.
We didn’t understand each other properly. Bad open source practice in sense of taking someone credits.
Providing uptodate images is extremely costly which no hardware vendor (except rpi) can assure. And certainly beyond one man projects.
The U-Boot documentation has some information on how to build and flash U-Boot.
https://docs.u-boot.org/en/latest/board/rockchip/rockchip.html#building
have You managed to do that?
I’m trying to find out those:
seems like recent (from 2023 
radxa image had no support for those 
BTW: kernel 6.13 works perfectly on 3B
Not yet, was busy, but good news for kernel 6.13 , i’ll give it a try 
uname -a
Linux rock-3b 6.19.0-rc5-00139-g983d014aafb1 #1 SMP PREEMPT Sat Jan 17 00:40:53 UTC 2026 aarch64 GNU/Linux
Only one eth though, nvme broken / pcie on fresh start, dito for hdmi you have to modify the dts to make it work again
With Claude code help :
When running mainline Linux kernel 6.x (tested with 6.19-rc5) on Radxa ROCK 3B, the second Ethernet port (eth1) fails to initialize with:
rk_gmac-dwmac fe2a0000.ethernet eth1: Failed to reset the dma
rk_gmac-dwmac fe2a0000.ethernet eth1: stmmac_hw_setup: DMA engine initialization failed
rk_gmac-dwmac fe2a0000.ethernet eth1: __stmmac_open: Hw setup failed
Symptoms:
ip link set eth1 up returns “Connection timed out”The issue is NOT a Device Tree problem - it’s a U-Boot PHY reset issue.
The RTL8211F Ethernet PHYs require proper reset sequencing before Linux boots. Vendor U-Boot (or U-Boot built for ROCK 3A) does not properly reset the second PHY, causing the mainline stmmac driver to fail DMA initialization.
This was confirmed by Kwiboo (Jonas Karlman), who upstreamed ROCK 3B support to U-Boot and Linux:
“Use mainline U-Boot on any board with RTL8211F Ethernet PHYs for mainline Linux. Make sure you use a build for your board or you will have Ethernet issues in Linux, i.e. use a ROCK 3A image for 3B and you will only have one Ethernet port working.”
References:
sudo apt install -y build-essential gcc-aarch64-linux-gnu bison flex \
libssl-dev python3-dev python3-pyelftools python3-setuptools \
swig device-tree-compiler bc git
mkdir -p ~/uboot-rock3b && cd ~/uboot-rock3b
# 1. ARM Trusted Firmware
git clone --depth 1 https://github.com/ARM-software/arm-trusted-firmware.git
cd arm-trusted-firmware
make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3568 bl31
export BL31=$(pwd)/build/rk3568/release/bl31/bl31.elf
cd ..
# 2. Rockchip DDR Binary
git clone --depth 1 https://github.com/rockchip-linux/rkbin.git
export ROCKCHIP_TPL=$(pwd)/rkbin/bin/rk35/rk3568_ddr_1560MHz_v1.23.bin
# 3. Mainline U-Boot
git clone --depth 1 https://source.denx.de/u-boot/u-boot.git
cd u-boot
# IMPORTANT: Use rock-3b defconfig, NOT rock-3a!
make CROSS_COMPILE=aarch64-linux-gnu- rock-3b-rk3568_defconfig
make CROSS_COMPILE=aarch64-linux-gnu- BL31=$BL31 ROCKCHIP_TPL=$ROCKCHIP_TPL -j$(nproc)
BACKUP FIRST!
# Backup
sudo dd if=/dev/mtdblock0 of=~/spi-backup-$(date +%Y%m%d).bin bs=4M
# Flash
sudo dd if=u-boot-rockchip-spi.bin of=/dev/mtdblock0 bs=4K
sync && sudo reboot
After mainline U-Boot:
U-Boot 2026.04-rc1
Model: Radxa ROCK 3B
Net: eth1: ethernet@fe010000, eth0: ethernet@fe2a0000
In Linux - both ports working at 1Gbps! 
[ 13.623312] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full
[ 13.972066] rk_gmac-dwmac fe2a0000.ethernet eth1: Link is Up - 1Gbps/Full
If NVMe isn’t detected, ensure your DTS has:
&pcie3x2 {
vpcie3v3-supply = <&vcc3v3_sys2>;
};
sudo dd if=~/spi-backup-*.bin of=/dev/mtdblock0 bs=4K| Component | Status |
|---|---|
| eth0 |  1Gbps |
| eth1 | 1Gbps |
| WiFi (Intel 7265) | Working |
| NVMe | Working |
| U-Boot | Mainline 2026.04-rc1 |
| Kernel | Mainline 6.19-rc5 |
Tested on: Radxa ROCK 3B 8GB, Debian 11, Mainline Kernel 6.19-rc5
I could have done this sooner if I had followed @Kwiboo’s advice 
HDMI & NPU, but I’ve got the power supply chip pins (for the HDMI ) damaged on my board, I’ll have to do some soldering first. I’ll keep you updated.
Update, still on NPU, currently its working with rknn, goal is to use rocket driver , I will keep you posted 