Test mainline kernel and Ubuntu image on i.CoreMX6

Prerequisite packets:

install the packet:

sudo apt-get install gparted git build-essential libncurses5 wget u-boot-tools zlib1g-dev ncurses-dev \
cmake libc-dev-armhf-cross pkg-config-arm-linux-gnueabihf build-essential checkinstall cmake \
pkg-config lzop libc6 libstdc++6 debootstrap qemu-user-static binfmt-support

Prepare toolchain

Download the arm cross-compile:

wget https://releases.linaro.org/components/toolchain/binaries/7.2-2017.11/arm-linux-gnueabihf/gcc-linaro-7.2.1-2017.11-i686_arm-linux-gnueabihf.tar.xz

and unpack it.

tar -xvf gcc-linaro-7.2.1-2017.11-i686_arm-linux-gnueabihf.tar.xz

Download and build u-boot

git clone http://git.denx.de/u-boot.git/ -
git checkout v2017.11
/home/matteo/_work_/test-ubuntu/
export ARCH=arm
export CROSS_COMPILE=../gcc-linaro-7.2.1-2017.11-i686_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
make imx6qdl_icore_mmc_defconfig
make

Download and build Linux kernel

Download the latest source code:

wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.15.7.tar.xz

and unpack it.

tar -xvf linux-4.15.7.tar.xz

build the kernel:

export ARCH=arm
export CROSS_COMPILE=../gcc-linaro-7.2.1-2017.11-i686_arm-linux-gnueabihf//bin/arm-linux-gnueabihf-
export LOADADDR=0x10008000
cd linux-4.15.7
make imx_v6_v7_defconfig
make -j 8 uImage
make dtbs

Download and build an Ubuntu root filesystem

We'll use the debootstrap tool:

export target=ubuntu-rootfs
export distro=artful
sudo debootstrap --arch=armhf --foreign --include=ubuntu-keyring,apt-transport-https,ca-certificates,openssl $distro "$target" http://ports.ubuntu.com
sudo cp /usr/bin/qemu-arm-static $target/usr/bin
sudo cp /etc/resolv.conf $target/etc

Now have a minimal Ubuntu rootfs - chroot to it and perform the 2nd stage install:

sudo chroot $target
distro=artful
export LC_ALL=C LANGUAGE=C LANG=C
/debootstrap/debootstrap --second-stage

Now Edit the sources. list repositories

vi /etc/apt/sources.list

and enter:

deb http://ports.ubuntu.com/ubuntu-ports/ artful main restricted universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports/ artful-updates main restricted universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports/ artful-security main restricted universe multiverse

set the root password:

passwd root

And then launch the visudo command

visudo
Under the line that looks like:
root ALL=(ALL:ALL) ALL

now add ubuntu keys

apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 40976EAF437D05B5
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32
apt-get update
apt -y -f install
apt-get upgrade

Now you can install extra packets with apt command. Ex:

apt-get install nano

Now your rootfs is ready.

Exit chroot and remove useless file:

exit
sudo rm $target/etc/resolv.conf
sudo rm $target/usr/bin/qemu-arm-static

Now build the kernel module and firmware:

 cd linux-4.15.7/
 export ARCH=arm
 export CROSS_COMPILE=../gcc-linaro-7.2.1-2017.11-i686_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
 make modules
 sudo make modules_install  INSTALL_MOD_PATH=../ubuntu-rootfs/ ARCH=arm

Prepare SD card.

suppose that your sd card is mounted as /dev/sdc

export DISK=/dev/sdc

- Flash the SPL image into the micro SD card:

sudo dd if=u-boot/SPL of=${DISK} bs=1k seek=1; sync

- Flash the u-boot-dtb.img image into the micro SD card:

sudo dd if=u-boot/u-boot-dtb.img of=${DISK} bs=1k seek=69; sync

sudo fdisk ${DISK}
steps:
d ///delete all partitions currently on sd
n // create new partition
p // Primary partition
1 // partition number 1
8192 //default
+32M //
n // created 2d parition
p
2
73728
default
w

sudo mkfs.vfat ${DISK}1
sudo mkfs.ext3 ${DISK}2

sudo mount ${DISK}1 /mnt
sudo cp linux-4.15.7/arch/arm/boot/uImage /mnt/
sudo cp linux-4.15.7/arch/arm/boot/dts/imx6q-icore.dtb /mnt/
sudo umount /mnt

sudo mount ${DISK}2 /mnt
sudo cp -arf ubuntu-rootfs/* /mnt/
sudo umount /mnt

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Test mainline kernel and Ubuntu image on i.CoreMx6