RK3188-SOM

Revision as of 03:24, 24 October 2014 by StefanM (talk | contribs) (Debian Wheezy)

Linux

Booting from SD-card

Writing Rockchip loader

dd if=loader.img of=/dev/sde conv=sync,fsync
dd if=parameter of=/dev/sde conv=sync,fsync seek=$((0x2000))
dd if=boot.img of=/dev/sde conv=sync,fsync seek=$((0x2000+0x2000))

Building kernel

./mkbootimg --kernel RK3188-SOM/arch/arm/boot/Image --ramdisk initrd.img -o boot.img

Creating root filesystem

Debian Wheezy

In this post we will explain how you can create your own Debian rootfs with pre-installed packages of your choice, which to allow tiny Linux images to be created. All steps below should work on any Debian host (Debian/Ubuntu etc) and are verified with Ubuntu 12.04LTS. First of all you need to install the support packages on your pc:

  • Install needed packages:
sudo apt-get install qemu-user-static debootstrap binfmt-support
  • Define some variables:
targetdir=rootfs
distro=wheezy
  • Build first stage:
mkdir $targetdir
sudo debootstrap --arch=armhf --foreign $distro $targetdir
  • Copy needed files from host to the target:
sudo cp /usr/bin/qemu-arm-static $targetdir/usr/bin/
sudo cp /etc/resolv.conf $targetdir/etc

If everything is right we now have a minimal Debian Rootfs.

  • Login into the new filesystem:
sudo chroot $targetdir 
  • Inside the chroot we need to set up the environment again
distro=wheezy
export LANG=C 
  • Now we are setup the second stage of debootstrap needs to run install the packages downloaded earlier
/debootstrap/debootstrap --second-stage
  • Once the package installation has finished, setup some support files and apt configuration.
cat <<EOT > /etc/apt/sources.list
deb http://ftp.uk.debian.org/debian $distro main contrib non-free
deb-src http://ftp.uk.debian.org/debian $distro main contrib non-free
deb http://ftp.uk.debian.org/debian $distro-updates main contrib non-free
deb-src http://ftp.uk.debian.org/debian $distro-updates main contrib non-free
deb http://security.debian.org/debian-security $distro/updates main contrib non-free
deb-src http://security.debian.org/debian-security $distro/updates main contrib non-free
EOT 
  • Update Debian package database:

apt-get update


set up locales dpkg scripts tend to complain otherwise, note in jessie you will also need to install the dialog package as well.


apt-get install locales dialog dpkg-reconfigure locales


Install some useful packages inside the chroot apt-get install openssh-server ntpdate


Set a root password so you can login passwd


Build a basic network interface file so that the board will DHCP on eth0 echo <<EOT >> /etc/network/interfaces allow-hotplug eth0 iface eth0 inet static address 192.168.1.254 netmask 255.255.255.248 gateway 192.168.1.1 EOT


Note: Your board will be accessible over SSH on IP address defined above !


Set the hostname echo nameme > /etc/hostname


Enable the serial console, Debian sysvinit way echo T0:2345:respawn:/sbin/getty -L ttyS0 115200 vt100 >> /etc/inittab


We are done inside the chroot, so quit the chroot shell exit


Tidy up the support files sudo rm $targetdir/etc/resolv.conf sudo rm $targetdir/usr/bin/qemu-arm-static


Now you have your Debian rootfs. Next step is to build Kernel, Uboot and to make your SD-card as explained in our early posts and Build instructions but instead to use the rootfs in the posts you can use your own minimal rootfs which you created above. The rootfs image created above is approx 150MB, it could be made smaller if you remove more packages.

  • Adding new user

apt-get install xfce4
apt-get install lightdm

Booting from NAND

Booting from USB-stick

Android