ATSAMA5D27-SOM1-EK1 Getting Started

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This is a page about Microchip’s Cortex-A5 SMART SAMA5D27-SOM1 based evaluation platform (ATSAMA5D27-SOM1-EK1).

Availability

Boards:

Basic Requirements

ARM Cross Compiler: GCC

This is a pre-built (64bit) version of Linaro GCC that runs on generic linux, sorry (32bit) x86 users, it’s time to upgrade…
Download/Extract:

#~/
wget -c https://releases.linaro.org/components/toolchain/binaries/6.4-2018.05/arm-linux-gnueabihf/gcc-linaro-6.4.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
tar xf gcc-linaro-6.4.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
export CC=`pwd`/gcc-linaro-6.4.1-2018.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-

Test Cross Compiler:

#~/
${CC}gcc --version
arm-linux-gnueabihf-gcc (Linaro GCC 6.4-2018.05) 6.4.1 20180425 [linaro-6.4-2018.05 revision 7b15d0869c096fe39603ad63dc19ab7cf035eb70]
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Bootloader: AT91Bootstrap

AT91Bootstrap – Microchip’s first step bootloader: http://www.at91.com/linux4sam/bin/view/Linux4SAM/AT91Bootstrap
Source: https://github.com/linux4sam/at91bootstrap
Download:

#~/
git clone https://github.com/linux4sam/at91bootstrap
cd at91bootstrap/
git checkout v3.8.10 -b tmp

Configure and Build:

#~/at91bootstrap
make ARCH=arm CROSS_COMPILE=${CC} distclean
make ARCH=arm CROSS_COMPILE=${CC} sama5d27_som1_eksd_uboot_defconfig
make ARCH=arm CROSS_COMPILE=${CC}

Bootloader: U-Boot

Das U-Boot – the Universal Boot Loader: http://www.denx.de/wiki/U-Boot
eewiki.net patch archive: https://github.com/eewiki/u-boot-patches
Download:

#~/
git clone https://github.com/u-boot/u-boot
cd u-boot/
git checkout v2019.01-rc3 -b tmp

Patches:

#~/u-boot
wget -c https://github.com/eewiki/u-boot-patches/raw/master/v2019.01-rc3/0001-ARM-at91-Convert-SPL_GENERATE_ATMEL_PMECC_HEADER-to-.patch
wget -c https://github.com/eewiki/u-boot-patches/raw/master/v2019.01-rc3/0001-sama5dX-fixes.patch
 
patch -p1 < 0001-ARM-at91-Convert-SPL_GENERATE_ATMEL_PMECC_HEADER-to-.patch
patch -p1 < 0001-sama5dX-fixes.patch

Configure and Build:

#~/u-boot
make ARCH=arm CROSS_COMPILE=${CC} distclean
make ARCH=arm CROSS_COMPILE=${CC} sama5d27_som1_ek_mmc_defconfig
make ARCH=arm CROSS_COMPILE=${CC}

Linux Kernel

This script will build the kernel, modules, device tree binaries and copy them to the deploy directory.
Download:

#~/
git clone https://github.com/RobertCNelson/armv7_devel
cd armv7_devel/

For v4.14.x-sama5-armv7 (Longterm 4.14.x):

#~/armv7_devel/
git checkout origin/v4.14.x-sama5-armv7 -b tmp

For v4.19.x-sama5-armv7 (Longterm 4.19.x):

#~/armv7_devel/
git checkout origin/v4.19.x-sama5-armv7 -b tmp

Build:

#~/armv7_devel/
./build_kernel.sh

Root File System

Debian 9

UserPassword
debiantemppwd
rootroot

Download:

#~/
wget -c https://rcn-ee.com/rootfs/eewiki/minfs/debian-9.6-minimal-armhf-2018-11-26.tar.xz

Verify:

#~/
sha256sum debian-9.6-minimal-armhf-2018-11-26.tar.xz
c9d9b2623131829eeeefa153274219d89887a1984b8dde72cfbfe29f29c7a10d  debian-9.6-minimal-armhf-2018-11-26.tar.xz

Extract:

#~/
tar xf debian-9.6-minimal-armhf-2018-11-26.tar.xz

Ubuntu 18.04 LTS

UserPassword
ubuntutemppwd

Download:

#~/
wget -c https://rcn-ee.com/rootfs/eewiki/minfs/ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz

Verify:

#~/
sha256sum ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz
d8190bc858bab9db83bec03707b2636dc23646fca2a0420fb49adbedf7d492c5  ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz

Extract:

#~/
tar xf ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz

Setup microSD card

For these instruction we are assuming, DISK=/dev/mmcblk0, lsblk is very useful for determining the device id.

export DISK=/dev/mmcblk0

Erase partition table/labels on microSD card:

sudo dd if=/dev/zero of=${DISK} bs=1M count=50

Create Partition Layout:
With util-linux v2.26, sfdisk was rewritten and is now based on libfdisk.

sudo sfdisk --version
sfdisk from util-linux 2.27.1

#sfdisk >= 2.26.x
sudo sfdisk ${DISK} <<-__EOF__
1M,48M,0xE,*
49M,,,-
__EOF__

#sfdisk <= 2.25.x
sudo sfdisk --unit M ${DISK} <<-__EOF__
1,48,0xE,*
49,,,-
__EOF__

Format Partition:

for: DISK=/dev/mmcblk0
sudo mkfs.vfat -F 16 -n BOOT ${DISK}p1
sudo mkfs.ext4 -L rootfs ${DISK}p2
 
for: DISK=/dev/sdX
sudo mkfs.vfat -F 16 -n BOOT ${DISK}1
sudo mkfs.ext4 -L rootfs ${DISK}2

Mount Partition:
On most systems these partitions may will be auto-mounted…

sudo mkdir -p /media/boot/
sudo mkdir -p /media/rootfs/
 
for: DISK=/dev/mmcblk0
sudo mount ${DISK}p1 /media/boot/
sudo mount ${DISK}p2 /media/rootfs/
 
for: DISK=/dev/sdX
sudo mount ${DISK}1 /media/boot/
sudo mount ${DISK}2 /media/rootfs/

#~/

Install Kernel and Root File System

To help new users, since the kernel version can change on a daily basis. The kernel building scripts listed on this page will now give you a hint of what kernel version was built.

-----------------------------
Script Complete
eewiki.net: [user@localhost:~$ export kernel_version=4.X.Y-Z]
-----------------------------

Copy and paste that “export kernel_version=4.X.Y-Z” exactly as shown in your own build/desktop environment and hit enter to create an environment variable to be used later.

export kernel_version=4.X.Y-Z

Copy Root File System

#~/
sudo tar xfvp ./*-*-*-armhf-*/armhf-rootfs-*.tar -C /media/rootfs/
sync
sudo chown root:root /media/rootfs/
sudo chmod 755 /media/rootfs/

Copy Kernel Image

Kernel Image:

#~/
sudo cp -v ./armv7_devel/deploy/${kernel_version}.zImage /media/boot/zImage

Copy Kernel Device Tree Binaries

#~/
sudo mkdir -p /media/boot/dtbs/
sudo tar xfvo ./armv7_devel/deploy/${kernel_version}-dtbs.tar.gz -C /media/boot/dtbs/

Copy Kernel Modules

#~/
sudo tar xfv ./armv7_devel/deploy/${kernel_version}-modules.tar.gz -C /media/rootfs/

File Systems Table (/etc/fstab)

sudo sh -c "echo '/dev/mmcblk0p2  /  auto  errors=remount-ro  0  1' >> /media/rootfs/etc/fstab"
sudo sh -c "echo '/dev/mmcblk0p1  /boot/uboot  auto  defaults  0  2' >> /media/rootfs/etc/fstab"

Remove microSD/SD card

sync
sudo umount /media/boot
sudo umount /media/rootfs
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