NanoPi K2

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1 Introduction

NanoPi K2-1.jpg
NanoPi K2-2.jpg
NanoPi K2-3.jpg
  • FriendlyElec's NanoPi K2 uses Amlogic's 64-bit quad-core A53 S905 SoC. This SoC has an internal Mali450 GPU. S905's dynamic frequency scales up to 2G Hz.In FriendlyElec's tests it can scale up to 2G. Its most significant feature is that it supports various video formats and has strong video decoding capability
  • The NanoPi K2 has 2GB DDR3 RAM, onboard WiFi & Bluetooth, 1000M Ethernet, USB, HDMI, IR and more. It has a socket for adding an external eMMC card. It boots an OS from a TF card. It has the same form factor, GPIO interface and port layout as the RPi 3. An Android image is ready for K2. Later on a Ubuntu image will be ready.
  • A special feature of the NanoPi K2 is that it supports DVFS and can play high-definition video steams stably and smoothly. It is a good platform for applications such as advertisement machines, TV boxes, home entertainment appliances, multi-media devices and etc.

2 Hardware Spec

  • SoC: Amlogic S905, Quad-core ARM Cortex-A53@1.5GHz, DVFS
  • GPU: Penta-core ARM Mali™-450
  • RAM: 2GB DDR3
  • Network Connectivity: 10/100/1000M (RTL8211F)
  • Wireless：802.11 b/g/n
  • Bluetooth：4.0 dual mode
  • Antenna: One onboard porcelain antenna shared by both WiFi and Bluetooth. One individual IPX interface.
  • IR: Onboard IR receiver
  • Audio: Via HDMI/Bluetooth
  • eMMC interface: eMMC socket
  • I2S: 7-Pin, 2.54mm pitch pin-header
  • SD: 1 x MicroSD slot
  • USB Host: 4 x USB 2.0 Host, standard type A
  • Micro USB: 1 x USB 2.0, OTG, power input and data transmission
  • HDMI: HDMI 2.0, Type-A. It supports 4K video
  • GPIO: 40-Pin, 2.54mm pitch pin-header including I2C, ADC, GPIO, UART, PWM, SPDIF and CVBS
  • Serial debug port: 4-Pin, 2.54mm pitch single-row pin-header
  • User Key: 1 x power key
  • LED: 1 x power LED and 1 x status LED
  • Power Interface: DC jack, MicroUSB
  • Power Supply: DC 5V/2A
  • PCB dimension: 56 x 85mm，6-layer, ENIG

3 Diagram, Layout and Dimension

3.1 Layout

NanoPi-K2 Layout
  • GPIO Pin Description
Pin# Name Pin# Name
1 SYS_3.3V 2 VDD_5V
3 GPIODV_24/I2C_SDA_A 4 VDD_5V
5 GPIODV_25/I2C_SCK_A 6 GND
7 GPIOY_0 8 GPIOY_13/UART_TX_C
9 DGND 10 GPIOY_13/UART_RX_C
11 GPIOY_1 12 GPIOY_16/PWM_A
13 GPIOY_2 14 GND
15 GPIOY_3 16 GPIOY_15/PWM_F
17 SYS_3.3V 18 GPIOY_4
19 GPIOY_5 20 GND
21 GPIOY_7 22 GPIOY_6
23 GPIOY_9 24 GPIOY_8
25 DGND 26 GPIOY_10
27 GPIODV_26/I2C_SDA_B 28 GPIODV_27/I2C_SCK_B
29 GPIOY_11/SPDIF_IN 30 GND
31 GPIOAO_5 32 GPIOY_12/SPDIF_OUT
33 GPIOH_3 34 GND
35 GPIOCLK_1 36 CVBS
37 AIN1 38 1.8V Vref Out
39 GND 40 AIN0
  • eMMC Interface Pin Description
Pin# Name Pin# Name
1 eMMC_D0 2 eMMC_D1
3 eMMC_D2 4 eMMC_D3
5 eMMC_D4 6 eMMC_D5
7 eMMC_D6 8 eMMC_D7
9 eMMC_DS 10 GND
11 eMMC_CMD 12 eMMC_CLK
13 NC 14 GND
15 NC 16 1.8V OUT
17 eMMC_RST 18 3.3V OUT
19 GPIOY_5 20 GND
  • Debug Port（UART0）
Pin# Name
1 GND
2 VDD_5V
3 UART_TX_AO_A
4 UART_RX_AO_A
  • 7Pin I2S Interface Pin Description
Pin# Name
1 GND
2 SYS_3.3V
3 I2S_SCLK
4 I2S_LRCLK
5 I2S_DATA_OUT
6 I2S_DATA_IN
7 I2S_MCLK
Notes
  1. SYS_3.3V: 3.3V power output
  2. VDD_5V: 5V power output5V. The input range is 4.7V ~ 5.6V
  3. All pins are 3.3V
  4. For more details refer to the document:NanoPi-K2-1701-Schematic.pdf

3.2 Board Dimension

NanoPi K2 Dimensions

For more details refer to the document:NanoPi-K2-1701-dxf.zip

4 Get Started

4.1 Essentials You Need

Before starting to use your NanoPi K2 get the following items ready

  • NanoPi K2
  • MicroSD Card/TF Card: Class 10 or Above, minimum 8GB SDHC
  • A DC 5V/2A power is a must
  • HDMI monitor
  • USB keyboard and USB mouse
  • A host computer running Ubuntu 16.04 64 bit system

4.2 TF Cards We Tested

To make your NanoPi K2 boot and run fast we highly recommend you use a Class10 8GB SDHC TF card or a better one. The following cards are what we used in all our test cases presented here:

  • SanDisk TF 8G Class10 Micro/SD TF card:

SanDisk MicroSD 8G

  • SanDisk TF128G MicroSDXC TF 128G Class10 48MB/S:

SanDisk MicroSD 128G

  • 川宇 8G C10 High Speed class10 micro SD card:

chuanyu MicroSD 8G

4.3 Make an Installation TF Card

4.3.1 Boot OS from TF Card

Get the following files from download link:

  • Get a 8G SDHC card
Image Files:
nanopi-k2_android_5.1.1-YYYYMMDD.img.zip Android5.1 Image File
nanopi-k2_ubuntu_core_xenial-YYYYMMDD.img.zip Ubuntu-Core with Qt-Embedded Image File
Flash Utility:
win32diskimager.rar Windows utility. Under Linux users can use "dd"
  • Extract an image file and win32diskimager.rar. Insert a TF card(at least 8G) into a Windows PC and run the win32diskimager utility as administrator. On the utility's main window select your TF card's drive, the wanted image file and click on "write" to start flashing the TF card.
  • Insert this card into your NanoPi K2's BOOT slot and power on (with a 5V/2A power source). If both the green LED and blue LED are solid on this indicates your NanoPi K2 has successfully booted.

4.3.2 Make Installation Card under Linux Desktop

  • 1) Insert your SD card into a host computer running Ubuntu and check your SD card's device name
dmesg | tail

Search the messages output by "dmesg" for similar words like "sdc: sdc1 sdc2". If you can find them it means your SD card has been recognized as "/dev/sdc". Or you can check that by commanding "cat /proc/partitions".

  • 2) Downlaod Linux script
git clone https://github.com/friendlyarm/sd-fuse_amlogic.git
cd sd-fuse_amlogic
  • 3) Make Android SD Card
su
./fusing.sh /dev/sdx

(Note: you need to replace "/dev/sdx" with the device name in your system)
When you run the script for the first time it will prompt you to download an image you have to hit “Y” within 10 seconds otherwise you will miss the download

4.3.3 Extend NanoPi K2's SD Card Section

  • If your board runs Ubuntu you can skip this section since Ubuntu will automatically extend your SD card's section. When Android is loaded you need to run the following commands on your host PC to extend your SD card's section:
sudo umount /dev/sdx?
sudo parted /dev/sdx unit % resizepart 4 100 unit MB print
sudo resize2fs -f /dev/sdx4

(Note: you need to replace "/dev/sdx" with the device name in your system)

4.3.4 HDMI Resolution

If your NanoPi K2 is connected to an HDMI monitor and it runs Android it will automatically set the resolution to an appropriate HDMI mode by checking the "EDID".

4.4 Run Android

  • Insert an SD card with Android image into your NanoPi K2, connect the board to an HDMI monitor, power on the board K2 will boot from the SD card. If you can see the PWR LED on and the blue LED are solid on it means your board is working and you will see Android being loaded on the HDMI monitor.


NanoPi K2 Android5.1

  • It is recommended to turn off its power by pressing the PWR key otherwise the system data in the TF card will be damaged.

4.5 Play Multi-Media Stream with Kodi

Kodi is pre-installed on Android. It supports hard-decoding. Here is how Kodi looks like:
Kodi-Homepage
Insert a USB storage card with a video file to K2's USB port and on Kodi's main window select "Videos -> udisk0" to load and play the video file in the storage card:
Kodi-Playing

5 Make Your Own OS Image

5.1 Install Cross Compiler

  • Install ARMv7 Cross Compiler

Download the compiler package: 

git clone https://github.com/friendlyarm/prebuilts.git
sudo mkdir -p /opt/FriendlyARM/toolchain
sudo tar xf prebuilts/gcc-x64/arm-cortexa9-linux-gnueabihf-4.9.3.tar.xz -C /opt/FriendlyARM/toolchain/

Then add the compiler's directory to "PATH" by appending the following lines in "~/.bashrc".: 

export PATH=/opt/FriendlyARM/toolchain/4.9.3/bin:$PATH
export GCC_COLORS=auto

Execute "~/.bashrc" to make the changes take effect. Note that there is a space after the first ".": 

. ~/.bashrc

This compiler is a 64-bit one therefore it cannot be run on a 32-bit Linux machine. After the compiler is installed you can verify it by running the following commands: 

arm-linux-gcc -v
Using built-in specs.
COLLECT_GCC=arm-linux-gcc
COLLECT_LTO_WRAPPER=/opt/FriendlyARM/toolchain/4.9.3/libexec/gcc/arm-cortexa9-linux-gnueabihf/4.9.3/lto-wrapper
Target: arm-cortexa9-linux-gnueabihf
Configured with: /work/toolchain/build/src/gcc-4.9.3/configure --build=x86_64-build_pc-linux-gnu
--host=x86_64-build_pc-linux-gnu --target=arm-cortexa9-linux-gnueabihf --prefix=/opt/FriendlyARM/toolchain/4.9.3
--with-sysroot=/opt/FriendlyARM/toolchain/4.9.3/arm-cortexa9-linux-gnueabihf/sys-root --enable-languages=c,c++
--with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3 --with-float=hard
...
Thread model: posix
gcc version 4.9.3 (ctng-1.21.0-229g-FA)
  • Install AArch64 Cross Compiler

The AArch64 cross compiler is needed to compile U-Boot and Linux. We used linaro toolchain: 

wget http://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/aarch64-linux-gnu/gcc-linaro-4.9.4-2017.01-x86_64_aarch64-linux-gnu.tar.xz
tar xf gcc-linaro-4.9.4-2017.01-x86_64_aarch64-linux-gnu.tar.xz
export PATH=~/gcc-linaro-4.9.4-2017.01-x86_64_aarch64-linux-gnu/bin:$PATH

Add the compiler's directory to "PATH".

5.2 Compile U-Boot

Download the U-Boot source code and compile it. Note that the github's branch is nanopi-k2-v2015.01: 

git clone https://github.com/friendlyarm/u-boot.git uboot
cd uboot
git checkout nanopi-k2-v2015.01
make nanopi-k2_defconfig
make

After your compilation succeeds a u-boot.bin will be generated. If you want to test it flash it to your installation SD card via fastboot. Here is how you can do it: 

sudo ./fusing.sh /dev/sdc

Or you can do it with fastboot:
1) On your host PC run "sudo apt-get install android-tools-fastboot" to install the fastboot utility;
2) Connect your NanoPi K2 to your host PC via a serial cable (e.g. PSU-ONECOME). Press the enter key within two seconds right after you power on your NanoPi K2 and you will enter uboot's command line mode;
3) After type in "fastboot" and press "enter" you will enter the fastboot mode;
4) Connect your NanoPi K2 to this host PC via a microUSB cable and type in the following command to flash u-boot.bin:

fastboot flash bootloader fip/gxb/u-boot.bin

5.3 Compile Linux kernel

5.3.1 Compile Kernel

  • Download Kernel Source Code
git clone https://github.com/friendlyarm/linux.git
cd linux
git checkout nanopi-k2-3.14.y

The NanoPi K2's kernel source code lies in the "nanopi-k2-3.14.y" branch.

  • Compile Android Kernel
make ARCH=arm64 nanopi-k2_defconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image nanopi-k2.dtb

After your compilation succeeds an arch/arm64/boot/dts/amlogic/nanopi-k2.dtb file and an arch/arm64/boot/Image will be generated. You can use them to replace the existing files under your SD card's boot section.

5.3.2 User Your Generated Kernel

  • Update the kernel file in SD card

If you use an SD card to boot Android you can copy your generated uImage file and nanopi-k2.dtb file to your SD card's boot section(e.g. section 1 /dev/sdX1).

  • Update kernel with adb

You can update your kernel with adb and here is how you can do it: 

adb shell mount -t ext4 /dev/block/mmcblk0p1 /storage/sdcard1/
adb push arch/arm64/boot/Image /storage/sdcard1/
adb push arch/arm64/boot/dts/amlogic/nanopi-k2.dtb /storage/sdcard1/
adb reboot
  • Update Image and nanopi-k2.dtb

If you want to generate a new Android's boot.img you need to use your newly generated image and nanopi-k2.dtb to replace the existing files under "device/friendly-arm/nanopi-k2-kernel" and recompile Android.

5.4 Compile Android

  • Install Cross Compiler

Install a 64-bit Ubuntu 14.04 on your host PC 

sudo apt-get install bison g++-multilib git gperf libxml2-utils make python-networkx zip
sudo apt-get install flex libncurses5-dev zlib1g-dev gawk minicom

For more details refer to https://source.android.com/source/initializing.html

  • Download Android5.1 Source Code

You need to use repo to get the Android source code. Refer to https://source.android.com/source/downloading.html . 

mkdir android && cd android
repo init -u https://github.com/friendlyarm/android_manifest.git -b nanopi-k2-lollipop
repo sync

"android" is the working directory.

  • Compile System
source build/envsetup.sh
lunch nanopi_k2-userdebug
make -j8

After compilation succeeds an image file will be generated under "out/target/product/nanopi-k2"

filename partition Description
u-boot.bin bootloader -
boot.img boot -
cache.img cache -
userdata.img userdata -
system.img system -
partmap.txt - partition file
  • Flash Image to SD Card

If you want to boot your board from an SD card you need to copy your generated image file to the "sd-fuse_amlogic/android/" directory and flash it to your SD card with our script. For more details refer to # Make Installation Card under Linux Desktop.

  • Update Image with fastboot

Right after the NanoPi K2 is booted press any key to enter the uboot commandline mode and type in "fastboot usb"
Connect your K2 to a host PC with a USB cable and type the following commands from your PC's terminal: 

cd out/target/product/nanopi-k2
sudo fastboot flash boot boot.img
sudo fastboot flash cache cache.img
sudo fastboot flash userdata userdata.img
sudo fastboot flash system system.img
sudo fastboot reboot

6 Update Log

6.1 2017-07-19

为NanoPi-K2增加Ubuntu Core系统，内含Qt-Embedded图形界面库，系统特性如下：

  • 支持HDMI输出
  • 支持WiFi连接
  • 支持千兆以太网
  • 支持蓝牙传输
  • 内建Qt-Embedded

得益于A53架构处理器强大的性能，2G内存以及千兆以太网，NanoPi-K2搭配Ubuntu系统非常适合作为IoT服务端，或DIY各类轻量级的服务器，如Nas等。


6.2 April-14-2017

  • Released English version

6.3 June-4-2017

  • Added section 4.5: kodi support
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