40×40mmの極小ボード「Nano Pi NEO2」
https://akiba-pc.watch.impress.co.jp/docs/news/news/1115433.html
https://intaa.net/archives/8067
https://intaa.net/archives/8459
https://qiita.com/mskairmail/items/8025ba8eee3a4408c521
https://continue-to-challenge.blogspot.com/2017/08/nanopi-neozonemindernginx.html
・Raspberry Pi OS
・NanoPi Neo2
・wiki – NanoPi Neo2
・wiki – NanoPi Neo3

NanoPi Neo2
2 Hardware Spec
CPU: Allwinner H5,
Quad-core 64-bit high-performance Cortex A53
DDR3 RAM: 512MB
Connectivity: 10/100/1000M Ethernet, RTL8211E-VB-CG chip
USB Host: USB Type A x 1 and USB pin header x 2
MicroSD Slot: MicroSD x 1 for system boot and storage
LED: Power LED x 1, System LED x 1
GPIO1: 2.54mm pitch 24 pin-header, compatible with Raspberry Pi’s GPIO pin1 – pin 24. It includes UART, SPI, I2C, IO etc
GPIO2: 2.54mm pitch 12 pin-header. It includes USB, IR receiver, I2S, IO etc
Serial Debug Port: 2.54mm pitch 4pin-header
Audio In/Out: 2.54mm pitch 4 pin-header
MicroUSB: Power input(5V/2A) and OTG
PCB Dimension: 40 x 40mm
Working Temperature: -20℃ to 70℃
Weight: 13g(WITHOUT Pin-headers)
OS/Software: u-boot,Ubuntu Core

2.1 UbuntuCore 16.04

NanoPi Neo3
2 Hardware Spec
Soc: RockChip RK3328,
Quad-core 64-bit high-performance Cortex A53
RAM: 1GB/2GB DDR4
LAN: 10/100/1000M Ethernet with unique MAC
USB Host: 1x USB3.0 Type A and 2x USB2.0 on 2.54mm pin header
MicroSD Slot: MicroSD x 1 for system boot and storage
LED: Power LED x 1, System LED x 1
Key: User Button x 1
Fan: 2Pin JST ZH 1.5mm Connector for 5V Fan
GPIO: 2.54mm pitch 26 pin-header, include I2C, UART, SPI, I2S, GPIO
Serial Debug Port: 2.54mm pitch 3 pin-header, 1500000bps
Power: 5V/1A, via Type-C or GPIO
PCB Dimension: 48 x 48mm
Working Temperature: -20℃ to 70℃
Weight: 22g
A host computer running Ubuntu 18.04 64-bit system