Rock Pi 4C SBC to Support Dual Display Setups via micro HDMI and mini DP Ports

Rockchip RK3399 powered Rock Pi 4 SBC was introduced at the end of 2018 and followed nearly exactly Raspberry Pi 3 Model B form factor just with a more powerful processor, GPU, as well as more memory depending on which model you purchase.

But in June 2019, the Raspberry Pi foundation launched Raspberry Pi 4 SBC with a much faster processor and many of the same ports as its predecessor except for support for two HDMI displays via micro HDMI ports. Radxa has now followed suit with Rock Pi 4C which offers two modern video outputs, but with a twist as the upcoming SBC combines one micro HDMI port with one mini DP port.

rock pi 4 model C
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Rock Pi 4C was introduced at the XDC 2019 conference where open-source graphics developers meet, and Radxa was a “supporter”.

The company explains Rock Pi 4B uses RK3399’s USB type-C controller for the two USB 3.0 ports, and as a result, they only have 2 remaining lanes for DisplayPort which they routed to a mini DP port supporting up to 2560 x 1440 resolution at 60 Hz on DisplayPort 1.2 monitors. The HDMI port still supports 3840×2160 @ 60 Hz but the full-size HDMI port has been replaced by a micro HDMI port due to space constraints.

Rock Pi 4C preliminary specifications:

  • SoC – Rockchip RK3399 big.LITTLE hexa-core processor with  2x Arm Cortex-A72 @ up to 1.8 GHz, 4x Cortex-A53 @ up to 1.4 GHz, a Mali-T864 GPU with support OpenGL ES1.1/2.0/3.0/3.1, OpenVG1.1, OpenCL, DX11, and AFBC, and a VPU with 4K VP9 and 4K 10-bit H265/H264 decoding
  • System Memory – 64-bit 4GB LPDDR4 @ 3200 Mbps (single chip)
  • Storage – eMMC module socket, micro SD card slot up to 128GB, 4-lane M.2 NVMe SSD socket
  • Video Output / Display Interface
    • micro HDMI 2.0a up to 4K @ 60 Hz
    • mini DP 1.2 up to 2560 x 1440 @ 60 Hz
    • 2-lane MIPI DSI via FPC connector
    • Dual independent display support
  • Audio – Via HDMI and 3.5mm audio jack; HD codec supporting up to 24-bit/96Khz audio
  • Camera – MIPI-CSI2 connector for camera up to 8MP
  • Connectivity – Gigabit Ethernet with PoE support (additional HAT required), 802.11ac WiFi 5, Bluetooth 5.0 with on-board antenna
  • USB – 1x USB 3.0 host port, 1x USB 3.0 OTG port, 2x USB 2.0 host ports
  • Expansion
    • 40-pin expansion header with 1x UART, 2x SPI bus, 2x I2C bus,  1x PCM/I2S, 1x SPDIF, 1x PWM, 1x ADC, 6x GPIO, and power signals (5V, 3.3V, and GND)
  • Misc – RTC
  • Power Supply – Via USB-C port supporting USB PD 2.0 (9V/2A, 12V/2A, 15V/2A, or 20V/2A) and Qualcomm Quick Charge 3.0/.0 (9V/2A, 12V/1.5A).
  • Dimensions – 85 x 54 mm

Rock Pi 4C board will only come with 4GB RAM, as the option for 1 or 2GB RAM will not be offered since they change to a new 64-bit single-chip 4GB LPDDR4 RAM for easier manufacturing and quality assurance. Software support remains the same with Android TV, Android, Debian Desktop and Ubuntu Server operating systems handled by Radxa, and there are also third-party images such as Armbian, RecalBox or LibreELEC.

Rock Pi 4C will launch at the end of this month, and the price will be the same as for the equivalent Rock Pi 4B model, meaning $75  excluding shipping and taxes.

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5 Replies to “Rock Pi 4C SBC to Support Dual Display Setups via micro HDMI and mini DP Ports”

  1. Nice to see that some SBCs are showing DisplayPort some love, but a real shame about the DisplayPort bandwidth and resolution here.

    I think if they had used the USB-C DP output and a PCIe USB3.0 controller, then you could have DisplayPort MST to have multiple displays from the single port. At least, this is how it works for other USB-C devices, I’m not positive of the constraints of Rockchip’s USB-C implementation. Maybe what I’m proposing isn’t supported on the RK3399.

      1. Yep.

        domih@rkpi4:~$ lspci
        00:00.0 PCI bridge: Fuzhou Rockchip Electronics Co., Ltd Device 0100
        01:00.0 Non-Volatile memory controller: Micron/Crucial Technology Device 2263 (rev 03)
        domih@rkpi4:~$ sudo lspci -vv -s 01:00.0 | grep Width
        LnkCap: Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L0s <1us, L1 <8us
        LnkSta: Speed 2.5GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        domih@rkpi4:~$ sudo lspci -vv -s 00:00.0 | grep Width
        LnkCap: Port #0, Speed 2.5GT/s, Width x4, ASPM L1, Exit Latency L0s <256ns, L1 <8us
        LnkSta: Speed 2.5GT/s, Width x4, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-

    1. I wouldn’t like to loose the pcie for usb3 i think its ok as it is just the micro HDMI is crap would have preferred a usbc based hdmi instead…

  2. How would the DisplayPort play along with the mipiDSI interface? Could you technically have 3 outputs from this board then?

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