SAMA5D27 WLSOM1 Evaluation Kit

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 ATSAMA5D27-WLSOM1-EK1 is ideal for evaluating and prototyping with the SAMA5D27-WLSOM1, Wireless System On Module (SOM) and the SAMA5D27C-LD2G, LPDDR2 System In Package (SIP).

The Evaluation Kit is made up of a baseboard, an ATSAMA5D27-WLSOM1 SOM soldered on the baseboard and an ATSAMA5D27C-LD2G SIP soldered on the SOM.

The ATSAMA5D27-WLSOM1 Module integrates a 2-Gbit LPDDR2SDRAM, a Wi-Fi®/Bluetooth® module, a Secure Element device, a Power Management IC (PMIC), a QSPI memory, a 10/100 Mbps Ethernet PHY. 94 GPIO pins are provided by the SOM for general use in the system.

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

The SAMA5D27 WLSOM1 EK documents can be found on microchip website, as following:

Kit Overview

Kit User Guide


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 DEBUG serial port

The serial console can be accessed from the DEBUG port with the help of a TTL-to-USB serial cable (marked as DEBUG J26).

Using DEBUG on TTL-to-USB connector (DEBUG J26)

  • For Microsoft Windows users: Install the driver of your USB TTL serial cable. FTDI-based ones are the most popular, have a look to this page to get the driver: * Be sure to connect a 3.3V compatible cable and identify its GND pin. Place it properly according to the silkscreen and connect the cable to the board (J26)
    • For Microsoft Windows users: Identify the USB connection that is established, USB Serial Port should appear in Device Manager. The COMxx number will be used to configure the terminal emulator.
      ftdi serial line
    • For Linux users: Identify the serial USB connection by monitoring the last lines of dmesg command. The /dev/ttyUSBx number will be used to configure the terminal emulator.
      [605576.562740] usb 1-1.1.2: new full-speed USB device number 17 using ehci-pci
      [605576.660920] usb 1-1.1.2: New USB device found, idVendor=0403, idProduct=6001
      [605576.660933] usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
      [605576.660939] usb 1-1.1.2: Product: TTL232R-3V3
      [605576.660944] usb 1-1.1.2: Manufacturer: FTDI
      [605576.660958] usb 1-1.1.2: SerialNumber: FTGNVZ04
      [605576.663092] ftdi_sio 1-1.1.2:1.0: FTDI USB Serial Device converter detected
      [605576.663120] usb 1-1.1.2: Detected FT232RL
      [605576.663122] usb 1-1.1.2: Number of endpoints 2
      [605576.663124] usb 1-1.1.2: Endpoint 1 MaxPacketSize 64
      [605576.663126] usb 1-1.1.2: Endpoint 2 MaxPacketSize 64
      [605576.663128] usb 1-1.1.2: Setting MaxPacketSize 64
      [605576.663483] usb 1-1.1.2: FTDI USB Serial Device converter now attached to ttyUSB0
      A /dev/ttyUSB0 node has been created.
  • 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 SAMA5D27 WLSOM1 EK - linux4sam-poky-sama5d27_wlsom1_ek-headless-6.2.img.bz2 (~ 92 MB)
md5: 6f0f419f917f63d58887bce044c611ac
Linux4SAM Yocto Project / Poky based demo
compiled from tag linux4sam_6.2
Follow procedure: #Create_a_SD_card_with_the_demo
PDA5" (TM5000 or AC320005-5) linux4sam-poky-sama5d27_wlsom1_ek-graphics-6.2.img.bz2 (~ 201 MB)
md5: 6b96408f949ef9a379df110763f0a24b
BuildRoot based demo
SD Card image SAMA5D27 WLSOM1 EK - linux4sam-buildroot-sama5d27_wlsom1_ek-headless-6.2.img.bz2 (~ 47 MB)
md5: 77cb4977a6a20ed6e9624c28a9675048
Linux4SAM BuildRoot based demo
compiled from tag linux4sam_6.2
Follow procedure: #Create_a_SD_card_with_the_demo
PDA5" (TM5000 or AC320005-5) linux4sam-buildroot-sama5d27_wlsom1_ek-graphics-6.2.img.bz2 (~ 237 MB)
md5: a8199dad82eefddc77399fa1bacb8481
OpenWrt based demo
SD Card image SAMA5D27 WLSOM1 EK - linux4sam-openwrt-sama5d27_wlsom1_ek-headless-6.2.img.gz (~ 17 MB)
md5: e8ee252db0d29176f979380ba4111ba9
Linux4SAM OpenWrt based demo
compiled from tag linux4sam_6.2
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!

Play with the PTC demos

For more details regarding the PTC demos, please see UsingPTC.

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/sama5d27_wlsom1_ek 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 sama5d27_wlsom1_eksd_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-2019.04-at91 -b u-boot-2019.04-at91
       Branch u-boot-2019.04-at91 set up to track remote branch u-boot-2019.04-at91 from origin.
       Switched to a new branch 'u-boot-2019.04-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 quad-SPI serial flash:
   # To put environment variables in SD/MMC card:

Here are the building steps for the SAMA5D27-WLSOM1-EK board:

# You can change the config according to your needs.
make sama5d27_wlsom1_ek_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: 5812545, done.
remote: Total 5812545 (delta 0), reused 0 (delta 0), pack-reused 5812545
Receiving objects: 100% (5812545/5812545), 1.63 GiB | 4.89 MiB/s, done.
Resolving deltas: 100% (4862825/4862825), done.
Checking connectivity... done.
Checking out files: 100% (56330/56330), 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]                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-4.19-at91 -b linux-4.19-at91
Branch linux-4.19-at91 set up to track remote branch linux-4.19-at91 from origin.
Switched to a new branch 'linux-4.19-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 at91sam 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.

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: warrior

This Layer depends on :
- poky
URI: git://
Branch: warrior
Tag: 1153a954e652304b6b5d287437817b7da891d491

- meta-openembedded
URI: git://
Branch: warrior
Tag: 3bdbf72e3a4bf18a4a2c7afbde4f7ab773aeded9

- meta-qt5
URI: git://
Branch: jansa/warrior (5.12)
Tag: dc2dedef9961950b88f4245ba7499538ec4244ab

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 warrior

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

3/ Clone meta-qt5 git repository with the proper branch ready
git clone git://
cd meta-qt5
git checkout upstream/warrior
cd ..

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

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

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

7/ Add meta-atmel layer to bblayer configuration file
vim conf/bblayers.conf

# POKY_BBLAYERS_CONF_VERSION is increased each time build/conf/bblayers.conf
# changes incompatibly


BSPDIR := "${@os.path.abspath(os.path.dirname(d.getVar('FILE', True)) + '/../../..')}"

  ${BSPDIR}/poky/meta \
  ${BSPDIR}/poky/meta-poky \
  ${BSPDIR}/poky/meta-yocto-bsp \
  ${BSPDIR}/meta-atmel \
  ${BSPDIR}/meta-openembedded/meta-oe \
  ${BSPDIR}/meta-openembedded/meta-networking \
  ${BSPDIR}/meta-openembedded/meta-python \
  ${BSPDIR}/meta-openembedded/meta-multimedia \
  ${BSPDIR}/meta-qt5 \

  ${BSPDIR}/poky/meta \
  ${BSPDIR}/poky/meta-poky \

8/ Edit local.conf to specify the machine, location of source archived, package type (rpm, deb or ipk)
Pick one MACHINE name from the "Supported SoCs / MACHINE names" chapter above
and edit the "local.conf" file. Here is an example:

vim conf/local.conf
MACHINE ??= "sama5d2-xplained"
DL_DIR ?= "your_download_directory_path"
PACKAGE_CLASSES ?= "package_ipk"
USER_CLASSES ?= "buildstats image-mklibs"

To get better performance, use the "poky-atmel" distribution by also adding that
DISTRO = "poky-atmel"

9/ Build core minimal image
bitbake core-image-minimal

10/ We found that additional local.conf changes are needed for our QT demo
image. You can add these two lines at the end of the file:
vim conf/local.conf

11/ Build images
bitbake microchip-headless-image

Typical bitbake output
Build Configuration:
BB_VERSION           = "1.42.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "arm-poky-linux-gnueabi"
MACHINE              = "sama5d2-xplained-sd"
DISTRO               = "poky-atmel"
DISTRO_VERSION       = "2.7.1"
TUNE_FEATURES        = "arm vfp cortexa5 neon vfpv4 thumb callconvention-hard"
TARGET_FPU           = "hard"
meta-yocto-bsp       = "warrior:1153a954e652304b6b5d287437817b7da891d491"
meta-atmel           = "warrior:f883dcdcb4e55ec0e073c497221e7fe7466b7acb"
meta-multimedia      = "warrior:3bdbf72e3a4bf18a4a2c7afbde4f7ab773aeded9"
meta-qt5             = "warrior:dc2dedef9961950b88f4245ba7499538ec4244ab"

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:

Nicolas Ferre 
Patrice Vilchez 

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


Connect Module From PDA: How to connect LCD module from PDA to the Boards. (Kernel)
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)
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)
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)
Using ISC: How to use the Image Sensor Controller. (Kernel, linux-4.9-at91, linux-4.14-at91, linux-4.19-at91)
Pwm Faq: PWM Driver. (Kernel, linux-3.10-at91, linux-3.18-at91, linux-4.1-at91, linux-4.4-at91, linux-4.9-at91, linux-4.14-at91, linux-4.19-at91)
Using Atmel DRMDriver: Using Atmel KMS/DRM LCD 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)
PDADetection At Boot: PDA detection in U-boot. (U-Boot)
Using SAMA 5 D 2 ADCDevice: Using the SAMA5D2-compatible ADC device. (Kernel, linux-4.1-at91, linux-4.4-at91, linux-4.9-at91, linux-4.14-at91, linux-4.19-at91)
Using Max Touch: Introduction for how to use MaxTouch. (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)
Selecting PDAat Boot: How to manually select PDA in U-boot. (U-Boot, Kernel)
Using PTC: How to use PTC. (linux-4.9-at91, linux-4.14-at91, linux-4.19-at91)