In-Circuit ICnova A20

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In-Circuit ICnova A20
In-circuit icnova a20 som in baseboard.jpeg
Manufacturer In-Circuit GmbH
Dimensions 29mm x 68mm (SO-DIMM)
Release Date October 2014
Website Device Product/Wiki Page
SoC A20 @ 1Ghz
DRAM 512MiB DDR3 @ 384MHz
NAND (NAND-option is deprecated)
Power DC 5V @ 2A
Video HDMI (Type A - full)
Audio 3.5mm headphone plug, 3.5mm microphone plug, HDMI
Network 10/100Mbps Ethernet (Realtek RTL8201CP)
Storage µSD, SATA
USB 2 USB2.0 Host, 1 USB2.0 OTG

The In-Circuit ICnova A20, also labelled "SoMPi", is a SO-DIMM sized System-On-Module which usually comes with the ADB4006 daughterboard sold by the same company.


The SO-DIMM System-On-Module has absolutely no discernable markings on it.

On the ADB4006 daughterboard, below where the SOM sits, it reads:


On the back of the ADB4006 daughterboard PCB, the following is silkscreened:

ICnova ADB4006
Application Development Board
for SoMPi
design and copyright by
In-Circuit GmbH

Sunxi support

Current status

Full upstream support.

Buildroot 2023.11
Kernel 6.5
U-Boot v2024.01

Manual build

You can build things for yourself by following our Manual build howto and by choosing from the configurations available below.


Sunxi/Legacy U-Boot

Use the INCIRCUIT_ICNOVA_A20 build target.

Mainline U-Boot

Use the icnova-a20-adb4006_defconfig build target.

Linux Kernel

Sunxi/Legacy Kernel

Use the in-circuit_icnova_a20_on_adb4006.fex file.

Mainline kernel

Use the sun7i-a20-icnova-a20-adb4006.dtb device-tree binary.


Use the icnova-a20-adb4006_defconfig build target.

Tips, Tricks, Caveats

FEL mode

The 'Boot' button triggers FEL mode.

Adding a serial port

ADB4006 primary UART connector

On the top side of the ADB4006 baseboard, there is a nicely marked UART0 connector. Just attached some leads according to our UART howto.

There are further headers with UART2/5/6/7 on the board, but they are unpopulated.



ADB4006 Baseboard

Also known as

In-Circuit sometimes calls it SomPi but even the domain has now expired (status 20150924).

See also

Manufacturer images

  • The manufacturer does not provide any images and recommends Buildroot for building own images
  • A SD-Card is sold seperately, flashed with 'the latest buildroot image for SomPi A20-H and ADB4006' (currently based on 2023.11)