NanoPi Duo2

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1 Introduction

Overview

Front

Back

• The NanoPi Duo2("Duo2") is an ARM board designed and developed by FriendlyELEC for makers and hobbyists. It is only 55 x 25.4mm. It features Allwinner quad-core A7 processor H3, and has 256M/512M DDR3 RAM, onboard WiFi & bluetooth module and an OV5640 camera interface. It works with Linux variants such as Ubuntu Core.
• The NanoPi Duo2 is tiny and compact with rich interfaces and ports. It takes power input from its MicroUSB port and can be booted from a Micro SD card. It works with general bread-boards. Interface pins such as USB, SPI, UART, I2C, PWM, IR, audio input & output and Fast Ethernet etc are populated.
• The NanoPi Duo2 supports software utilities such as WiringNP and Python etc. These are all open source. It is suited for various IoT applications.

2 Hardware Spec

• CPU: Allwinner H3, Quad-core Cortex-A7 Up to 1.2GHz
• DDR3 RAM: 512M
• Connectivity: 10/100M Ethernet
• WiFi: 802.11b/g/n
• Bluetooth: Bluetooth V4.0 of 1, 2 and 3 Mbps.
• Camera: OV5640
• Key: GPIO Key
• USB Host: 2.54mm pin x2, exposed in 2.54mm pitch pin header
• MicroSD Slot x 1
• MicroUSB: OTG and power input
• Debug Serial Interface: exposed in 2.54mm pitch pin header
• Audio input/output Interface: exposed in 2.54mm pitch pin header
• GPIO1: 2.54mm spacing 16pin. It includes UART, SPI, I2C, Audio etc
• GPIO2: 2.54mm spacing 16pin. It includes USB,10/100M Ethernet, IO etc
• PCB Dimension: 25.4 x 55mm
• Power Supply: DC 5V/2A
• Temperature measuring range: -40℃ to 80℃
• OS/Software: U-boot，Linux Kernel 4.11.2 (mainline) , Ubuntu 16.04.2 LTS (Xenial)
• Weight: xxg(With Pin-headers)

3 Diagram, Layout and Dimension

3.1 Layout

NanoPi Duo2 Layout

pinout

• GPIO Pin Spec

Pin#	GPIO1	Name	Linux gpio		Pin#	GPIO2	Name	Linux gpio
1	5V	VDD_5V			2	RXD	DEBUG_RX(UART_RXD0)/GPIOA5/PWM0	5
3	5V	VDD_5V			4	TXD	DEBUG_TX(UART_TXD0)/GPIOA4	4
5	3V3	SYS_3.3V			6	GND	GND
7	GND	GND			8	SCL	I2C0_SCL/GPIOA11	11
9	IRRX	GPIOL11/IR-RX	363		10	SDA	I2C0_SDA/GPIOA12	12
11	PG11	GPIOG11	203		12	CS	UART3_TX/SPI1_CS/GPIOA13	13
13	DM3	USB-DM3			14	CLK	UART3_RX/SPI1_CLK/GPIOA14	14
15	DP3	USB-DP3			16	MISO	UART3_CTS/SPI1_MISO/GPIOA16	16
17	DM2	USB-DM2			18	MOSI	UART3_RTS/SPI1_MOSI/GPIOA15	15
19	DP2	USB-DP2			20	RX1	UART1_RX/GPIOG7	199
21	RD-	EPHY-RXN			22	TX1	UART1_TX/GPIOG6	198
23	RD+	EPHY-RXP			24	CVBS	CVBS
25	TD-	EPHY-TXN			26	LL	LINEOUT_L
27	TD+	EPHY-TXP			28	LR	LINEOUT_R
29	LNK	EPHY-LED-LINK			30	MP	MIC_P
31	SPD	EPHY-LED-SPD			32	MN	MIC_N

• Camera（OV5640）Pin Spec

Pin#	Name
1	NC1
2	AGND
3	SIO-D
4	AVDD
5	SIO-C
6	RESER
7	VSYNC
8	PWDN
9	HREF
10	DVDD
11	DOVDD
12	Y9/MDP1
13	XCLK
14	Y8/MDN1
15	DGND
16	Y7/MCP
17	PCLK
18	Y6/MCN
19	Y2
20	Y5/MDP0
21	Y3
22	Y4/MDN0
23	AF-VDD
24	NC2

Note

1. SYS_3.3V: 3.3V power output
2. VDD_5V: 5V power input/output. When the external device’s power is greater than the MicroUSB's the external device is charging the board otherwise the board powers the external device. The input range is 4.7V ~ 5.6V.
3. All pins are 3.3V, output current is 5mA.
4. For more details refer to :NanoPi Duo2 Schematic

3.2 Dimensional Diagram

For more details refer to :NanoPi_Duo2_V1.0_1807 pcb in dxf format

4 Get Started

4.1 Essentials You Need

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

• NanoPi Duo2
• microSD Card/TFCard: Class 10 or Above, minimum 8GB SDHC
• microUSB power. A 5V/2A power is a must
• A Host computer running Ubuntu 16.04 64 bit system
• A serial communication board

4.2 TF Cards We Tested

To make your NanoPi Duo2 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 TF128G MicroSDXC TF 128G Class10 48MB/S:

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

4.3 Install OS

4.3.1 Get Image Files

Visit this link download link to download image files (under the official-ROMs directory) and the flashing utility(under the tools directory):

Image Files:
nanopi-duo2_sd_friendlycore-xenial_4.14_armhf_YYYYMMDD.img.zip	FriendlyCore (base on UbuntuCore) Image File, Kernel: Linux-4.14
Flash Utility:
win32diskimager.rar	Windows utility for flashing Debian image. Under Linux users can use "dd"

4.4 Work with NanoPi Duo2 IoT-Box Carrier Board

FriendlyELEC developed a dedicated carrier board: NanoPi Duo2 IoT-Box. For more details about this carrier board refer to: Introduction to NanoPi Duo2 IoT-Box. How is a hardware setup:

5 Work with FriendlyCore

5.1 Introduction

FriendlyCore is a light Linux system without X-windows, based on ubuntu core, It uses the Qt-Embedded's GUI and is popular in industrial and enterprise applications.

Besides the regular Ubuntu Core's features FriendlyCore has the following additional features:

• it integrates Qt4.8;
• it integrates NetworkManager;
• it has bluez and Bluetooth related packages;
• it has alsa packages;
• it has npi-config;
• it has RPiGPIO, a Python GPIO module;
• it has some Python/C demo in /root/ directory;
• it enables 512M-swap partition;

5.2 System Login

• If your board is connected to an HDMI monitor you need to use a USB mouse and keyboard.
• If you want to do kernel development you need to use a serial communication board, ie a PSU-ONECOM board, which will

You can use a USB to Serial conversion board too.
Make sure you use a 5V/2A power to power your board from its MicroUSB port:

• FriendlyCore User Accounts:

Non-root User:

   User Name: pi
   Password: pi

Root:

   User Name: root
   Password: fa

The system is automatically logged in as "pi". You can do "sudo npi-config" to disable auto login.

• Update packages

$ sudo apt-get update

5.3 Configure System with npi-config

The npi-config is a commandline utility which can be used to initialize system configurations such as user password, system language, time zone, Hostname, SSH switch , Auto login and etc. Type the following command to run this utility.

$ sudo npi-config

Here is how npi-config's GUI looks like:

5.4 Develop Qt Application

Please refer to: How to Build and Install Qt Application for FriendlyELEC Boards

5.5 Setup Program to AutoRun

You can setup a program to autorun on system boot with npi-config:

sudo npi-config

Go to Boot Options -> Autologin -> Qt/Embedded, select Enable and reboot.

5.6 Extend TF Card's Section

When FriendlyCore is loaded the TF card's section will be automatically extended.You can check the section's size by running the following command:

$ df -h

5.7 Transfer files using Bluetooth

Take the example of transferring files to the mobile phone. First, set your mobile phone Bluetooth to detectable status, then execute the following command to start Bluetooth search.：

hcitool scan

Search results look like：

Scanning ...
    2C:8A:72:1D:46:02   HTC6525LVW

This means that a mobile phone named HTC6525LVW is searched. We write down the MAC address in front of the phone name, and then use the sdptool command to view the Bluetooth service supported by the phone：

sdptool browser 2C:8A:72:1D:46:02

Note: Please replace the MAC address in the above command with the actual Bluetooth MAC address of the mobile phone.
This command will detail the protocols supported by Bluetooth for mobile phones. What we need to care about is a file transfer service called OBEX Object Push. Take the HTC6525LVW mobile phone as an example. The results are as follows：

Service Name: OBEX Object Push
Service RecHandle: 0x1000b
Service Class ID List:
  "OBEX Object Push" (0x1105)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 12
  "OBEX" (0x0008)
Profile Descriptor List:
  "OBEX Object Push" (0x1105)
    Version: 0x0100

As can be seen from the above information, the channel used by the OBEX Object Push service of this mobile phone is 12, we need to pass it to the obexftp command, and finally the command to initiate the file transfer request is as follows：

obexftp --nopath --noconn --uuid none --bluetooth -b 2C:8A:72:1D:46:02 -B 12 -put example.jpg

Note: Please replace the MAC address, channel and file name in the above command with the actual one.

After executing the above commands, please pay attention to the screen of the mobile phone. The mobile phone will pop up a prompt for pairing and receiving files. After confirming, the file transfer will start.

Bluetooth FAQ：
1) Bluetooth device not found on the development board, try to open Bluetooth with the following command：

rfkill unblock 0

2) Prompt can not find the relevant command, you can try to install related software with the following command：

apt-get install bluetooth bluez obexftp openobex-apps python-gobject ussp-push

5.8 WiFi

For either an SD WiFi or a USB WiFi you can connect it to your board in the same way. The APXX series WiFi chips are SD WiFi chips. By default FriendlyElec's system supports most popular USB WiFi modules. Here is a list of the USB WiFi modules we tested:

Index	Model
1	RTL8188CUS/8188EU 802.11n WLAN Adapter
2	RT2070 Wireless Adapter
3	RT2870/RT3070 Wireless Adapter
4	RTL8192CU Wireless Adapter
5	mi WiFi mt7601
6	5G USB WiFi RTL8821CU
7	5G USB WiFi RTL8812AU

You can use the NetworkManager utility to manage network. You can run "nmcli" in the commandline utility to start it. Here are the commands to start a WiFi connection:

• Change to root

$ su root

• Check device list

$ nmcli dev

Note: if the status of a device is "unmanaged" it means that device cannot be accessed by NetworkManager. To make it accessed you need to clear the settings under "/etc/network/interfaces" and reboot your system.

• Start WiFi

$ nmcli r wifi on

• Scan Surrounding WiFi Sources

$ nmcli dev wifi

• Connect to a WiFi Source

$ nmcli dev wifi connect "SSID" password "PASSWORD" ifname wlan0

The "SSID" and "PASSWORD" need to be replaced with your actual SSID and password.If you have multiple WiFi devices you need to specify the one you want to connect to a WiFi source with iface
If a connection succeeds it will be automatically setup on next system reboot.

For more details about NetworkManager refer to this link: Use NetworkManager to configure network settings

If your USB WiFi module doesn't work most likely your system doesn't have its driver. For a Debian system you can get a driver from Debian-WiFi and install it on your system. For a Ubuntu system you can install a driver by running the following commands:

$ apt-get install linux-firmware

In general all WiFi drivers are located at the "/lib/firmware" directory.

5.9 Setup Wi-Fi Hotspot

Run the following command to enter AP mode:

$ su root
$ turn-wifi-into-apmode yes

You will be prompted to type your WiFi hotspot's name and password and then proceed with default prompts.
After this is done you will be able to find this hotspot in a neadby cell phone or PC. You can login to this board at 192.168.8.1:

$ ssh root@192.168.8.1

When asked to type a password you can type "fa".

To speed up your ssh login you can turn off your wifi by running the following command:

$ iwconfig wlan0 power off

To switch back to Station mode run the following command:

$ turn-wifi-into-apmode no

5.10 Bluetooth

Search for surrounding bluetooth devices by running the following command:

$ su root
$ hciconfig hci0 up
$ hcitool scan

You can run "hciconfig" to check bluetooth's status.

5.11 Ethernet Connection

If a board is connected to a network via Ethernet before it is powered on it will automatically obtain an IP with DHCP activated after it is powered up. If you want to set up a static IP refer to: Use NetworkManager to configure network settings。

5.12 WiringPi and Python Wrapper

• WiringNP: NanoPi NEO/NEO2/Air GPIO Programming with C
• RPi.GPIO : NanoPi NEO/NEO2/Air GPIO Programming with Python

5.13 Custom welcome message

The welcome message is printed from the script in this directory：

/etc/update-motd.d/

For example, to change the FriendlyELEC LOGO, you can change the file /etc/update-motd.d/10-header. For example, to change the LOGO to HELLO, you can change the following line：

TERM=linux toilet -f standard -F metal $BOARD_VENDOR

To:

TERM=linux toilet -f standard -F metal HELLO

5.14 Modify timezone

For exampe, change to Shanghai timezone:

sudo rm /etc/localtime
sudo ln -ls /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

5.15 Set Audio Device

If your system has multiple audio devices such as HDMI-Audio, 3.5mm audio jack and I2S-Codec you can set system's default audio device by running the following commands.

• After your board is booted run the following commands to install alsa packages:

$ apt-get update
$ apt-get install libasound2
$ apt-get install alsa-base
$ apt-get install alsa-utils

• After installation is done you can list all the audio devices by running the following command. Here is a similar list you may see after you run the command:

$ aplay -l
card 0: HDMI
card 1: 3.5mm codec
card 2: I2S codec

"card 0" is HDMI-Audio, "card 1" is 3.5mm audio jack and "card 2" is I2S-Codec. You can set default audio device to HDMI-Audio by changing the "/etc/asound.conf" file as follows:

pcm.!default {
    type hw
    card 0
    device 0
}
 
ctl.!default {
    type hw
    card 0
}

If you change "card 0" to "card 1" the 3.5mm audio jack will be set to the default device.
Copy a .wav file to your board and test it by running the following command:

$ aplay /root/Music/test.wav

You will hear sounds from system's default audio device.
If you are using H3/H5/H2+ series board with mainline kernel, the easier way is using npi-config。

5.16 Connect to DVP Camera OV5640

For NanoPi-Duo2 the OV5640 can work with Linux-4.14 Kernel.
The NanoPi-Duo2 has support for OV5640 cameras and you can directly connect an OV5640 camera to the board. Here is a hardware setup:

connect your board to camera module. Then boot OS, connect your board to a network, log into the board as root and run "mjpg-streamer":

$ cd /root/C/mjpg-streamer
$ make
$ ./start.sh

You need to change the start.sh script and make sure it uses a correct /dev/videoX node. You can check your camera's node by running the following commands:

$ apt-get install v4l-utils
$ v4l2-ctl -d /dev/video0 -D
Driver Info (not using libv4l2):
        Driver name   : sun6i-video
        Card type     : sun6i-csi
        Bus info      : platform:camera
        Driver version: 4.14.0
	...

The above messages indicate that "/dev/video0" is camera's device node.The mjpg-streamer application is an open source video steam server. After it is successfully started the following messages will be popped up:

 
$ ./start.sh
 i: Using V4L2 device.: /dev/video0
 i: Desired Resolution: 1280 x 720
 i: Frames Per Second.: 30
 i: Format............: YUV
 i: JPEG Quality......: 90
 o: www-folder-path...: ./www/
 o: HTTP TCP port.....: 8080
 o: username:password.: disabled
 o: commands..........: enabled

start.sh runs the following two commands:

export LD_LIBRARY_PATH="$(pwd)"
./mjpg_streamer -i "./input_uvc.so -d /dev/video0 -y 1 -r 1280x720 -f 30 -q 90 -n -fb 0" -o "./output_http.so -w ./www"

Here are some details for mjpg_streamer's major options:
-i: input device. For example "input_uvc.so" means it takes input from a camera;
-o: output device. For example "output_http.so" means the it transmits data via http;
-d: input device's subparameter. It defines a camera's device node;
-y: input device's subparameter. It defines a camera's data format: 1:yuyv, 2:yvyu, 3:uyvy 4:vyuy. If this option isn't defined MJPEG will be set as the data format;
-r: input device's subparameter. It defines a camera's resolution;
-f: input device's subparameter. It defines a camera's fps. But whether this fps is supported depends on its driver;
-q: input device's subparameter. It defines the quality of an image generated by libjpeg soft-encoding;
-n: input device's subparameter. It disables the dynctrls function;
-fb: input device's subparameter. It specifies whether an input image is displayed at "/dev/fbX";
-w: output device's subparameter. It defines a directory to hold web pages;

In our case the board's IP address was 192.168.1.230. We typed 192.168.1.230:8080 in a browser and were able to view the images taken from the camera's. Here is what you would expect to observe:

The mjpg-streamer utility uses libjpeg to software-encode steam data. The Linux-4.14 based ROM currently doesn't support hardware-encoding. If you use a H3 boards with Linux-3.4 based ROM you can use the ffmpeg utility to hardware-encode stream data and this can greatly release CPU's resources and speed up encoding:

$ ffmpeg -t 30 -f v4l2 -channel 0 -video_size 1280x720 -i /dev/video0 -pix_fmt nv12 -r 30 \
        -b:v 64k -c:v cedrus264 test.mp4

By default it records a 30-second video. Typing "q" stops video recording. After recording is stopped a test.mp4 file will be generated.

5.17 Connect to USB Camera(FA-CAM202)

The FA-CAM202 is a 200M USB camera. Connect your board to camera module. Then boot OS, connect your board to a network, log into the board as root and run "mjpg-streamer":

$ cd /root/C/mjpg-streamer
$ make
$ ./start.sh

You need to change the start.sh script and make sure it uses a correct /dev/videoX node. You can check your camera's node by running the following commands:

$ apt-get install v4l-utils
$ v4l2-ctl -d /dev/video0 -D
Driver Info (not using libv4l2):
        Driver name   : uvcvideo
        Card type     : HC 3358+2100: HC 3358+2100  / USB 2.0 Camera: USB 2.0 Camera
        Bus info      : usb-1c1b000.usb-1
	...

The above messages indicate that "/dev/video0" is camera's device node.The mjpg-streamer application is an open source video steam server. After it is successfully started the following messages will be popped up:

 
$ ./start.sh
 i: Using V4L2 device.: /dev/video0
 i: Desired Resolution: 1280 x 720
 i: Frames Per Second.: 30
 i: Format............: YUV
 i: JPEG Quality......: 90
 o: www-folder-path...: ./www/
 o: HTTP TCP port.....: 8080
 o: username:password.: disabled
 o: commands..........: enabled

start.sh runs the following two commands:

export LD_LIBRARY_PATH="$(pwd)"
./mjpg_streamer -i "./input_uvc.so -d /dev/video0 -y 1 -r 1280x720 -f 30 -q 90 -n -fb 0" -o "./output_http.so -w ./www"

Here are some details for mjpg_streamer's major options:
-i: input device. For example "input_uvc.so" means it takes input from a camera;
-o: output device. For example "output_http.so" means the it transmits data via http;
-d: input device's subparameter. It defines a camera's device node;
-y: input device's subparameter. It defines a camera's data format: 1:yuyv, 2:yvyu, 3:uyvy 4:vyuy. If this option isn't defined MJPEG will be set as the data format;
-r: input device's subparameter. It defines a camera's resolution;
-f: input device's subparameter. It defines a camera's fps. But whether this fps is supported depends on its driver;
-q: input device's subparameter. It defines the quality of an image generated by libjpeg soft-encoding;
-n: input device's subparameter. It disables the dynctrls function;
-fb: input device's subparameter. It specifies whether an input image is displayed at "/dev/fbX";
-w: output device's subparameter. It defines a directory to hold web pages;

In our case the board's IP address was 192.168.1.230. We typed 192.168.1.230:8080 in a browser and were able to view the images taken from the camera's. Here is what you would expect to observe:

5.18 Check CPU's Working Temperature

You can get CPU's working temperature by running the following command:

$ cpu_freq 
Aavailable frequency(KHz):
        480000 624000 816000 1008000
Current frequency(KHz):
        CPU0 online=1 temp=26548C governor=ondemand freq=624000KHz
        CPU1 online=1 temp=26548C governor=ondemand freq=624000KHz
        CPU2 online=1 temp=26548C governor=ondemand freq=624000KHz
        CPU3 online=1 temp=26548C governor=ondemand freq=624000KHz

This message means there are currently four CPUs working. All of their working temperature is 26.5 degree in Celsius and each one's clock is 624MHz.
Set CPU frequency:

$ cpu_freq -s 1008000
Aavailable frequency(KHz):
        480000 624000 816000 1008000
Current frequency(KHz):
        CPU0 online=1 temp=36702C governor=userspace freq=1008000KHz
        CPU1 online=1 temp=36702C governor=userspace freq=1008000KHz
        CPU2 online=1 temp=36702C governor=userspace freq=1008000KHz
        CPU3 online=1 temp=36702C governor=userspace freq=1008000KHz

5.19 Test Infrared Receiver

Note: Please Check your board if IR receiver exist.
By default the infrared function is disabled you can enable it by using the npi-config utility:

$ npi-config
    6 Advanced Options     Configure advanced settings
        A8 IR              Enable/Disable IR
            ir Enable/Disable ir[enabled]

Reboot your system and test its infrared function by running the following commands:

$ apt-get install ir-keytable
$ echo "+rc-5 +nec +rc-6 +jvc +sony +rc-5-sz +sanyo +sharp +mce_kbd +xmp" > /sys/class/rc/rc0/protocols   # Enable infrared
$ ir-keytable -t
Testing events. Please, press CTRL-C to abort.

"ir-keytable -t" is used to check whether the receiver receives infrared signals. You can use a remote control to send infrared signals to the receiver. If it works you will see similar messages as follows:

1522404275.767215: event type EV_MSC(0x04): scancode = 0xe0e43
1522404275.767215: event type EV_SYN(0x00).
1522404278.911267: event type EV_MSC(0x04): scancode = 0xe0e42
1522404278.911267: event type EV_SYN(0x00).

5.20 How to install and use docker (for armhf system)

5.20.1 How to Install Docker

Run the following commands：

sudo apt-get update
sudo apt-get install docker.io

5.20.2 Test Docker installation

Test that your installation works by running the simple docker image:

git clone https://github.com/friendlyarm/debian-jessie-arm-docker
cd debian-jessie-arm-docker
./rebuild-image.sh
./run.sh

6 Make Your Own Linux System

6.1 使用Linux-4.14 BSP

Duo2支持使用Linux-4.14内核，Linux-4.14内核主要由开源社区完善，在此基础上友善官方进行自家硬件的适配。
关于H3芯片系列开发板使用主线U-boot和Linux-4.14的方法，请参考维基：Building U-boot and Linux for H5/H3/H2+/

6.2 使用Linux-3.4 BSP

Linux3.4 BSP是由H3芯片厂商全志科技提供，在此基础上友善官方进行了自家硬件的适配。

6.2.1 Preparations

Get lichee source:

$ git clone https://github.com/friendlyarm/h3_lichee.git lichee --depth 1

Note: "lichee" is the project name named by Allwinner for its CPU's source code which contains the source code of U-boot, Linux kernel and various scripts.

6.2.2 Install Cross Compiler

Visit this site download link, enter the "toolchain" directory, download the cross compiler "gcc-linaro-arm.tar.xz" and copy it to the "lichee/brandy/toochain/" directory.

6.2.3 Compile lichee Source Code

Compilation of the H3's BSP source code must be done under a PC running a 64-bit Linux.The following cases were tested on Ubuntu-14.04 LTS-64bit:

$ sudo apt-get install gawk git gnupg flex bison gperf build-essential \
zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev \
libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 \
libgl1-mesa-dev g++-multilib mingw32 tofrodos \
python-markdown libxml2-utils xsltproc zlib1g-dev:i386

Enter the lichee directory and run the following command to compile the whole package:

$ cd lichee/fa_tools
$ ./build.sh -b nanopi-m1-plus -p linux -t all

After this compilation succeeds a u-boot, Linux kernel and kernel modules will be generated
Note: the lichee directory contains a cross-compiler we have setup. When you compile the source code it will automatically call this cross-compiler.

6.2.4 Compile U-boot

Note:you need to compile the whole lichee directory before you can compile U-boot individually.
You can run the following commands to compile U-boot:

$ cd lichee/fa_tools/
$ ./build.sh -b nanopi-m1-plus -p linux -t u-boot

The gen_script.sh script patches the U-boot with Allwinner features. A U-boot without these features cannot work.
Type the following command to update the U-boot on the MicroSD card:

$ cd lichee/fa_tools/
$ ./fuse.sh -d /dev/sdX -p linux -t u-boot

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

6.2.5 Compile Linux Kernel

Note:you need to compile the whole lichee directory before you can compile Linux kernel individually.
If you want to compile the Linux kernel run the following command:

$ cd lichee/fa_tools/
$ ./build.sh -b nanopi-m1-plus -p linux -t kernel

After the compilation is done a boot.img and its kernel modules will be generated under "linux-3.4/output".

6.2.6 Clean Source Code

$ cd lichee/fa_tools/
$ ./build.sh -b nanopi-m1-plus -p linux -t clean

7 Developer Guide

Set up CVBS

8 Resources

8.1 Datasheets & Schematics

• Schematic: NanoPi Duo2 V1.0 1807 Schematic
• Dimensional Diagram: NanoPi Duo2 V1.0 1807 PCB Dimensional Diagram
• H3's datasheet Allwinner_H3_Datasheet_V1.2.pdf

9 Hardware Update Versions

9.1 V1.0 1807

First Version

10 ChangeLog

2023-11-07
h3 FriendlyCore：
- Upgrade to Ubuntu Core 22.04;
h3 Debian Core：
- Add Debian bookworm core;

11 Update Log

11.1 Oct-10-2018

• Released English Version