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 4GiB originally, but this is no longer available in 2024.
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
Headers UART, JTAG, LVDS, GPIO, ...

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.

In-Circuit and open source software

On their website, In-Circuit used to claim that they had a Board-Support-Package available, and that they were available for "linux driver development and adaptation", but no such code was available from their website or wiki for the longest time. The device itself came shipped with a totally unaltered cubieboard2 cubiez image.

After buying the hardware, Luc Verhaegen contacted in-circuit GmbH with a request for the u-boot and linux kernel source code on 20150919. And again on 20150922. A buildroot tarball was provided on 20150929.

In their documentation, In-circuit GmbH stated "Combining the power and software-ease of community proven embedded boards like: +Banana-Pi, Cubie, OlinuXino and PCDUINO3". The provided buildroot tarball clearly used our sunxi-3.4 kernel, our classic sunxi u-boot, sunxi-tools, sunxi-mali and sunxi-cedarx, so this "community proven" thing is clearly very uni-directional. It is not clear why In-Circuit chose this mode of cooperation with the sunxi community, but it left a rather bad taste in the mouth.

Support for this board was only added to the kernel in may 2023, and to u-boot in november 2023. 9 years after this hardware was released. These commits are likely more a personal project of Ludwig Kormann, an employee of In-Circuit GmbH, rather than company policy. Ludwig then went and removed the historically accurate and still very relevant information from 2015, from this wiki on the 29th of january of 2024.

All in all, In-Circuit GmbH does not feel like a serious "linux driver development and adaptation" partner. If you really want to build an embedded device around an Allwinner A20 based SOM, take a look at Olimex A20-SOM instead, or get one of the other Community devices.


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

Fully upstreamed.

DTSes and u-boot config were upstreamed in may and november 2023 respectively. Due to the rather advanced support for the A20 by the open source community, no further work was required by an in-circuit employee about 9 years after the release of this hardware. So much for "linux driver development and adaptation".

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 long expired (status 20150924).

See also

Manufacturer images

  • The manufacturer mentioned Cubieboard2 images, but of course did not link to these directly. Beware though, Cubieboard2 and this device are of course not 100% compatible (even though In-Circuit claimed otherwise).
  • After several requests over more than a week in september 2015, a link to this buildroot tarball was provided.