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SoC Features

The SAMA5D2 series is a high-performance, ultra-low-power ARM Cortex-A5 processor based MPU. The Cortex A5 processor runs up to 500MHz and features the ARM NEON SIMD engine a 128kB L2 cache and a floating point unit. It supports multiple memories, including latest-generation technologies such as DDR3, LPDDR3, and QSPI Flash. It integrates powerful peripherals for connectivity (EMAC, USB, dual CAN, up to 10 UARTs, etc.) and user interface applications (TFT LCD controller, embedded capacitive touch controller, class D amplifier, audio PLL, CMOS sensor interface, etc.). The devices offer advanced security functions to protect customer code and secure external data transfers. These include ARM TrustZone, tamper detection, secure data storage, hardware encryption engines including private keys, on-the-fly decryption of code stored in external DDR or QSPI memory and a secure boot loader.

SAMA5D2 Chip Features

Kit Information

Kit Overview

The SAMA5D2 Industrial Connectivity Platform (SAMA5D2-ICP) provides a versatile Total System Solutions platform that highlights Microchip’s MPU and connectivity ICs for industrial networking applications. The board features three mikroBUS click interface headers to support over 450 MikroElektronika Click boards and provisions to solder a Microchip ATWILC3000-MR110CA or a ATWILC3000-MR110UA WiFi/BT module

The baseboard features a wide range of peripherals, as well as a user interface. Connectors and expansion headers allows for easy customization and quick access to leading edge embedded features such as MikroElektronica Click Boards™.

The Kit is supported by mainline Linux distribution as well as bare metal software frameworks allowing you to easily get started with your development.


Access the console

The usual serial communication parameters are 115200 8-N-1 :

Baud rate 115200
Data 8 bits
Parity None
Stop 1 bit
Flow control None

Access the console on JLINK micro-A USB connector (J16)

The serial console can be accessed from the micro-A USB connector that gives access to the on-board serial-to-USB converter (marked as J10 JLINK). In fact, the ATSAM3U chip on the Evaluation Kit acts as a serial-to-USB converter and is loaded with a firmware that is able to talk USB-CDC protocol.

  • For Microsoft Windows users: Install the J-Link CDC USB driver. No need to install a driver on any regular Linux distribution.
  • Connect the USB cable to the board (J16 JLINK)
    • For Microsoft Windows users: identify the USB connection that is established
      JLINK CDC UART Port should appear in Device Manager. The COMxx number will be used to configure the terminal emulator.
    • For Linux users: identify the USB connection by monitoring the last lines of dmesg command. The /dev/ttyACMx number will be used to configure the terminal emulator:
      usb 1- new high-speed USB device number 33 using ehci-pci
      usb 1- config 1 interface 1 altsetting 0 bulk endpoint 0x83 has invalid maxpacket 64
      usb 1- config 1 interface 1 altsetting 0 bulk endpoint 0x4 has invalid maxpacket 64
      usb 1- New USB device found, idVendor=1366, idProduct=0105
      usb 1- New USB device strings: Mfr=1, Product=2, SerialNumber=3
      usb 1- Product: J-Link
      usb 1- Manufacturer: SEGGER
      usb 1- SerialNumber: 000483029109
      cdc_acm 1- ttyACM0: USB ACM device
  • Now open your favorite terminal emulator with appropriate settings


Demo archives

Media type Board Screen Binary Description
Yocto Project / Poky based demo
SD Card image SAMA5D2-ICP - linux4sam-poky-sama5d2_icp-headless-2020.04.img.bz2 (~ 131 MB)
md5: c69620cbd57273e400043f242620799b
Linux4SAM Yocto Project / Poky based demo
compiled from tag linux4sam-2020.04
Follow procedure: #Create_a_SD_card_with_the_demo
BuildRoot based demo
SD Card image SAMA5D2-ICP - linux4sam-buildroot-sama5d2_icp-headless-2020.04.img.bz2 (~ 82 MB)
md5: a8e265dff4e3cff44eae49343cdc3196
Linux4SAM BuildRoot based demo
compiled from tag linux4sam-2020.04
Follow procedure: #Create_a_SD_card_with_the_demo
OpenWrt based demo
SD Card image SAMA5D2-ICP - linux4sam-openwrt-sama5d2_icp-headless-2020.04.img.gz (~ 13 MB)
md5: e6eb377d1215c0baacf796045d6052df
Linux4SAM OpenWrt based demo
compiled from tag linux4sam-2020.04
Follow procedure: #Create_a_SD_card_with_the_demo

Create a SD card with the demo

You need a 1 GB SD card (or more) and to download the image of the demo. The image is compressed to reduce the amount of data to download. This image contains:

  • a FAT32 partition with the AT91Bootstrap, U-Boot and the Linux Kernel (zImage and dtb).
  • an EXT4 partition for the rootfs.

Multi-platform procedure

To write the compressed image on the SD card, you will have to download and install Etcher. This tool, which is an Open Source software, is useful since it allows to get a compressed image as input. More information and extra help available on the Etcher website.

  • Insert your SD card and launch Etcher:

Etcher selection step

  1. Select the demo image. They are marked as "SD Card image" in the demo table above.
    Note that you can select a compressed image (like the demos available here). The tool is able to uncompress files on the fly
  2. Select the device corresponding to your SD card (Etcher proposes you the devices that are removable to avoid erasing your system disk)
  3. Click on the Flash! button
  4. On Linux, Etcher finally asks you to enter your root password because it needs access to the hardware (your SD card reader or USB to SD card converter)
  5. then the flashing process begins followed by a verification phase (optional)

Etcher flashing done!

  • Once writing done, Etcher asks you if you want to burn another demo image:

Etcher flashing done!

  • Your SD card is ready!

Build From source code

Setup ARM Cross Compiler

  • Ubuntu:
    In Ubuntu, you can install the ARM Cross Compiler by doing:
    sudo apt-get install gcc-arm-linux-gnueabi
    export CROSS_COMPILE=arm-linux-gnueabi-

  • Others:
    For others, you can download the Linaro cross compiler and setup the environment by doing:
    wget -c
    tar xf gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabi.tar.xz
    export CROSS_COMPILE=`pwd`/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-

Build AT91Bootstrap from sources

This section describes how to get source code from the git repository, how to configure with the default configuration, how to customize AT91Bootstrap based on the default configuration and finally to build AT91Bootstrap to produce the binary. take the default configuration to download U-Boot from NandFlash for example.

Get AT91Bootstrap Source Code

You can easily download AT91Bootstrap source code on the at91bootstrap git repository.

To get the source code, you should clone the repository by doing:

$ git clone git://
Cloning into 'at91bootstrap'...
remote: Enumerating objects: 51, done.
remote: Counting objects: 100% (51/51), done.
remote: Compressing objects: 100% (32/32), done.
remote: Total 10880 (delta 20), reused 39 (delta 19), pack-reused 10829
Receiving objects: 100% (10880/10880), 4.03 MiB | 395.00 KiB/s, done.
Resolving deltas: 100% (8300/8300), done.
$ cd at91bootstrap/

Configure AT91Bootstrap

Assuming you are at the AT91Bootstrap root directory, you will find a board/sama5d2_icp folder which contains several default configuration files:


TIP Tips: qspi means to read quad-SPI serial flash, sd means to read mmc card.

You can configure AT91Bootstrap to load U-Boot binary from SD Card by doing:

$ make mrproper
$ make sama5d2_icpsd_uboot_defconfig
If the configuring process is successful, the .config file can be found at AT91Bootstrap root directory.

Customize AT91Bootstrap

If the default configuration doesn't meet your need, after configuring with the default configuration, you can customize it by doing:
$ make menuconfig
Now, in the menuconfig dialog, you can easily add or remove some features to/from AT91Bootstrap as the same way as kernel configuration.
Move to <Exit> with arrows and press this button hitting the Enter key to exit from this screen.

Build AT91Bootstrap

Then you can build the AT91Bootstrap binary by doing:
$ make

If the building process is successful, the final .bin image is binaries/at91bootstrap.bin.

Build U-Boot from sources

Getting U-Boot sources

Dedicated page on U-Boot wiki:

You can easily download U-Boot source code from Linux4SAM GitHub U-Boot repository:

  • clone the Linux4sam GitHub U-Boot repository
       $ git clone git://
       Cloning into 'u-boot-at91'...
       remote: Enumerating objects: 106920, done.
       remote: Counting objects: 100% (106920/106920), done.
       remote: Compressing objects: 100% (24617/24617), done.
       remote: Total 566593 (delta 84756), reused 96342 (delta 81351), pack-reused 459673
       Receiving objects: 100% (566593/566593), 131.67 MiB | 430.00 KiB/s, done.
       Resolving deltas: 100% (456142/456142), done.
       $ cd u-boot-at91

  • The source code has been taken from the master branch which is pointing to the latest branch we use. If you want to use the other branch, you can list them and use one of them by doing:
       $ git branch -r
       origin/HEAD -> origin/master
       $ git checkout origin/u-boot-2020.01-at91 -b u-boot-2020.01-at91
       Branch u-boot-2020.01-at91 set up to track remote branch u-boot-2020.01-at91 from origin.
       Switched to a new branch 'u-boot-2020.01-at91'

Cross-compiling U-Boot

Before compiling the U-Boot, you need setup cross compile toolchain in the section.

Warning, important Latest versions of U-boot (2018.07 and newer) have a minimum requirement of 6.0 version of the GCC toolchain. We always recommend to use the latest versions.

Once the AT91 U-Boot sources available, cross-compile U-Boot is made in two steps: configuration and compiling. Check the Configuration chapter in U-Boot reference manual.

Pointing hand Go to the configs/ to find the exact target when invoking make.

The U-Boot environment variables can be stored in different media, above config files can specify where to store the U-Boot environment.

   # To put environment variables in SD/MMC card:

Here are the building steps for the SAMA5D2-ICP board:

# You can change the config according to your needs.
make sama5d2_icp_mmc_defconfig

The result of these operations is a fresh U-Boot binary called u-boot.bin corresponding to the binary ELF file u-boot.

  • u-boot.bin is the file you should store on the board
  • u-boot is the ELF format binary file you may use to debug U-Boot through a JTag link for instance.

Build Kernel from sources

Getting Kernel sources

To get the source code, you have to clone the repository:

$ git clone git://
Cloning into 'linux-at91'...
remote: Enumerating objects: 50, done.
remote: Counting objects: 100% (50/50), done.
remote: Compressing objects: 100% (44/44), done.
remote: Total 7282027 (delta 24), reused 17 (delta 6), pack-reused 7281977
Receiving objects: 100% (7282027/7282027), 2.09 GiB | 15.93 MiB/s, done.
Resolving deltas: 100% (6114478/6114478), done.
Checking out files: 100% (61813/61813), done.
$ cd linux-at91

The source code has been taken from the master branch which is pointing on the latest branch we use.

Pointing hand Note that you can also add this Linux4SAM repository as a remote GIT repository to your usual Linux git tree. It will save you a lot of bandwidth and download time:

$ git remote add linux4sam git://
$ git remote update linux4sam
Fetching linux4sam
From git://
 * [new branch]                linux-2.6.39-at91 -> linux4sam/linux-2.6.39-at91
 * [new branch]                linux-3.10-at91 -> linux4sam/linux-3.10-at91
 * [new branch]                linux-3.15-at91 -> linux4sam/linux-3.15-at91
 * [new branch]                linux-3.18-at91 -> linux4sam/linux-3.18-at91
 * [new branch]                linux-3.4.9-at91 -> linux4sam/linux-3.4.9-at91
 * [new branch]                linux-3.6.9-at91 -> linux4sam/linux-3.6.9-at91
 * [new branch]                linux-4.1-at91 -> linux4sam/linux-4.1-at91
 * [new branch]                linux-4.4-at91 -> linux4sam/linux-4.4-at91
 * [new branch]                linux-4.9-at91 -> linux4sam/linux-4.9-at91
 * [new branch]                linux-4.14-at91 -> linux4sam/linux-4.14-at91
 * [new branch]                linux-4.19-at91 -> linux4sam/linux-4.19-at91
 * [new branch]                linux-5.4-at91 -> linux4sam/linux-5.4-at91
 * [new branch]                master     -> linux4sam/master

If you want to use an other branch, you can list them and use one of them by doing this:

$ git branch -r
  origin/HEAD -> origin/master
$ git checkout origin/linux-5.4-at91 -b linux-5.4-at91
Branch linux-5.4-at91 set up to track remote branch linux-5.4-at91 from origin.
Switched to a new branch 'linux-5.4-at91'

Configure and Build the Linux kernel

Now you have to configure the Linux kernel according to your hardware. We have two default configuration at91 SoC in arch/arm/configs

  • at91_dt_defconfig: for SAM9 (ARM926) series chips
  • sama5_defconfig: for SAMA5 series chips

At this step, you can modify default configuration using the menuconfig

$ make ARCH=arm menuconfig
Now, in the menuconfig dialog, you can easily add or remove some features. Once done, Move to <Exit> with arrows and press this button hitting the Enter key to exit from this screen.

Build the Linux kernel image, before you build you need set up the cross compile toolchain, check this section.

$ make ARCH=arm


  Kernel: arch/arm/boot/Image is ready
  Kernel: arch/arm/boot/zImage is ready

Now you have an usable compressed kernel image zImage.

If you need an uImage you can run this additional step:

make ARCH=arm uImage LOADADDR=0x20008000


  Kernel: arch/arm/boot/zImage is ready
  UIMAGE  arch/arm/boot/uImage
Image Name:   Linux-4.1.0-linux4sam_5.3+
Created:      Fri Sep  9 17:02:45 2016
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    3441072 Bytes = 3360.42 kB = 3.28 MB
Load Address: 20008000
Entry Point:  20008000
  Image arch/arm/boot/uImage is ready

make ARCH=arm dtbs

  DTC     arch/arm/boot/dts/at91-kizbox2.dtb
  DTC     arch/arm/boot/dts/at91-nattis-2-natte-2.dtb
  DTC     arch/arm/boot/dts/at91-sama5d27_som1_ek.dtb
  DTC     arch/arm/boot/dts/at91-sama5d2_ptc_ek.dtb
  DTC     arch/arm/boot/dts/at91-sama5d2_xplained.dtb
  DTC     arch/arm/boot/dts/at91-sama5d3_xplained.dtb
  DTC     arch/arm/boot/dts/at91-tse850-3.dtb
  DTC     arch/arm/boot/dts/sama5d31ek.dtb
  DTC     arch/arm/boot/dts/sama5d33ek.dtb
  DTC     arch/arm/boot/dts/sama5d34ek.dtb
  DTC     arch/arm/boot/dts/sama5d35ek.dtb
  DTC     arch/arm/boot/dts/sama5d36ek.dtb
  DTC     arch/arm/boot/dts/sama5d36ek_cmp.dtb
  DTC     arch/arm/boot/dts/at91-sama5d4_ma5d4evk.dtb
  DTC     arch/arm/boot/dts/at91-sama5d4_xplained.dtb
  DTC     arch/arm/boot/dts/at91-sama5d4ek.dtb
  DTC     arch/arm/boot/dts/at91-sama5d4ek_isi.dtb
  DTC     arch/arm/boot/dts/at91-vinco.dtb

If the building process is successful, the final images can be found under arch/arm/boot/ directory.

Build Yocto/Poky rootfs from sources

Note that building an entire distribution is a long process. It also requires a big amount of free disk space.

The support for Atmel AT91 SoC family is included in a particular Yocto layer: meta-atmel. The source for this layer are hosted on Linux4SAM GitHub account:

Building environment

A step-by-step comprehensive installation is explained in the Yocto Project Quick Start. The following lines have to be considered as an add-on that is AT91 specific or that can facilitate your setup.


Here are the reference pages for setting up a Yocto building environment: What You Need and How You Get It.

Step by step build procedure

Note here is a copy of the README procedure available directly in the meta-atmel layer. This file in the meta-atmel layer repository must be considered as the reference and the following copy can be out-of-sync.

Note starting with Linux4SAM 2020.04 release, the meta-atmel layer supports Yocto templates, so make sure you create a new build environment using oe-init-build-env

This layer provides support for Microchip microprocessors (aka AT91)

For more information about the Microchip MPU product line see:
Linux & Open Source on Microchip microprocessors:

Supported SoCs / MACHINE names
Note that most of the machine names below, have a SD Card variant that can be
built by adding an "-sd" suffix to the machine name.
- SAMA5D2 product family / sama5d2-xplained, sama5d2-xplained-emmc, sama5d27-som1-ek-sd, sama5d2-ptc-ek, sama5d2-icp, sama5d27-wlsom1-ek-sd
- SAMA5D4 product family / sama5d4ek, sama5d4-xplained
- SAMA5D3 product family / sama5d3xek, sama5d3-xplained
- AT91SAM9x5 product family (AT91SAM9G15, AT91SAM9G25, AT91SAM9X25, AT91SAM9G35 and AT91SAM9X35) / at91sam9x5ek
- AT91SAM9RL / at91sam9rlek
- AT91SAM9G45 / at91sam9m10g45ek
- SAM9X60 / sam9x60ek

- meta-atmel
URI: git://
Branch: dunfell

This Layer depends on :
- poky
URI: git://
Branch: dunfell
Tag: 33fdf03169ab2a3355e090d41ba034855d47f865

- meta-openembedded
URI: git://
Branch: dunfell
Tag: a62ad77973b16daac1cbaa03cbda3c6b9b91f2ff

- meta-aws (for AWS Greengrass, mandatory for SAMA5D2 microchip-* images)
URI: git://
Branch: dunfell
Tag: 6fdd1bd619bde0207e990dde13f5a512e5a6552b

Build procedure

0/ Create a directory
mkdir my_dir
cd my_dir

1/ Clone yocto/poky git repository with the proper branch ready
git clone git:// -b dunfell

2/ Clone meta-openembedded git repository with the proper branch ready
git clone git:// -b dunfell

3/ Clone meta-aws git repository with the proper branch ready
git clone git:// -b dunfell

4/ Clone meta-atmel layer with the proper branch ready
git clone git:// -b dunfell

5/ Clone aws layer with the proper branch ready
git clone git:// -b dunfell

6/ Enter the poky directory to configure the build system and start the build process
cd poky

7/ Change TEMPLATECONF from .templateconf to:
export TEMPLATECONF=${TEMPLATECONF:-../meta-atmel/conf}
Note: If it's the first time you use Yocto Project templates, and if the
build-microchip directory remains from a previous use, we advice you start
from a fresh directory. Keep your build-microchip/conf/local.conf file for

8/ Initialize build directory
source oe-init-build-env build-microchip

9/ Build core minimal image
[MACHINE=] bitbake core-image-minimal

10/ Build images
[MACHINE=] bitbake microchip-headless-image

Typical bitbake output
Build Configuration:
BB_VERSION           = "1.46.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "arm-poky-linux-gnueabi"
MACHINE              = "sama5d2-xplained-sd"
DISTRO               = "poky-atmel"
DISTRO_VERSION       = "3.1"
TUNE_FEATURES        = "arm vfp cortexa5 neon vfpv4 thumb callconvention-hard"
TARGET_FPU           = "hard"
meta-yocto-bsp       = "dunfell:33fdf03169ab2a3355e090d41ba034855d47f865"
meta-multimedia      = "dunfell:a62ad77973b16daac1cbaa03cbda3c6b9b91f2ff"
meta-atmel           = "dunfell:070cc006f6a1f35493c6aa4a6cf7d50a24075f23"
meta-aws             = "dunfell:6fdd1bd619bde0207e990dde13f5a512e5a6552b"

To contribute to this layer you should submit the patches for review to:
the github pull-request facility directly or the forum. Anyway, don't forget to
Cc the maintainers.

AT91 Forum:

for some useful guidelines to be followed when submitting patches:

Codrin Ciubotariu 
Nicolas Ferre 

When creating patches insert the [meta-atmel] tag in the subject, for example
use something like:
git format-patch -s --subject-prefix='meta-atmel][PATCH' 

Recent FAQ


Wilc Faq: How to use WILC3000 on SAM development boards. (Kernel)
SDCard Boot Notice: How to boot up the board from SD card. (AT91Bootstrap)
USBGadget Config: Configure AT91 USB Gadget on Linux and Endpoint order management (composite USB). (Kernel, linux-4.4-at91, linux-4.9-at91, linux-4.14-at91, linux-4.19-at91, linux-5.4-at91)
Crypto Config: How to configure Crypto driver. (Kernel, linux-3.18-at91, linux-4.1-at91, linux-4.4-at91, linux-4.9-at91, linux-4.14-at91, linux-4.19-at91, linux-5.4-at91)
Using FITwith Overlays: How to use U-boot with FIT image to load overlays. (U-Boot, Kernel)
Patching DTin Uboot: How to apply DTBOs in U-boot. (U-Boot, Kernel)
U-Boot FAQ: Some U-Boot FAQ entries. (U-Boot)
Using Ultra Low Power Mode 1: Using Ultra Low Power mode 1 (ULP1). (Kernel, linux-4.1-at91, linux-4.4-at91)
r4 - 28 Mar 2020 - 13:59:55 - EugenHristev
Linux & Open Source related information for AT91 Smart ARM Microcontrollers

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