n900

Revision 28 as of 2011-02-17 13:56:56

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Installing Kubuntu on n900

Requirements:

  • Maemo5 pr1.3 installed
  • MicroSD 8GB, at least, class 6 or better.

Getting started

zcat maverick-preinstalled-mobile-armel+omap.img.gz > /dev/sdc1
  • fsck.ext3 the first partition (the one with the image on it)
  • mount the first microsd partition where you want
  • Enter it as chroot (you'll need to install qemu-arm-static and copy it from /usr/sbin to the partition)
  • Set a nameserver (e.g. echo "nameserver 8.8.8.8" >> /etc/resolv.conf)

  • Install the kubuntu mobile integration package from http://people.ubuntu.com/~apachelogger/mobile/n900-integration/

  • Add a new user to the system and ensure the user is member of the admin and sudo groups
  • You should install openssh-server very much Smile :)

  • The system is now ready to do an initial boot...

UBoot

  • Place a uImage on the 3rd partition, when uboot times out it will look there for the uImage and if found look for the OS on partition 1 (i.e. exactly our setup).
  • To boot to maemo execute 'run noloboot' in the uboot prompt

Flasher Boot

This method is based on the Meego instructions from http://meego.com/devices/handset/installing-meego-nokia-n900 and starts the Meego kernel.

  • Get the Meego vmlinuz and raw.bz2 files
    • bunzip the raw.bz2
    • inspect it using sudo fdisk -l -u $FILENAME
      • depending on the image you should see a couple of paritions, eventually you will need to try them
    • to mount you need to specify the offset of the partition, which is calculated by multiplying the start point of the partition (as per fdisk) with 512. e.g. if it starts at 1, the offset will be 1*512=512

sudo mount -o loop,offset=512 -t auto meego-handset-armv7l-n900-1.1-mmcblk0p.raw /mnt/
  • cp /mnt/boot/* /where/you/mounted/boot/
  • cp /mnt/lib/modules/2.6.35.3-10.3-n900 /where/you/mounted/lib/modules/
  • Additionally you want to replace your usb networking init with nokia-usb-networking from meego, as theirs is actually working
  • Turn off device (and unplug USB)
  • sudo flasher-3.5 -l -k meego-handset-armv7l-n900-*-vmlinuz-*-n900 -b
  • plug in USB, device should autostart and kernel should be transfered
  • kubuntu mobile starts Smile :)

UBoot Boot (not complete)

  • Enable the maemo.org extras-devel repository in n900, see http://wiki.maemo.org/Extras-devel

  • Install the 'uboot-pr13' package with apt-get install or from 'System' section
  • Verify it's installed by restarting your N900. A penguin should show up at startup and U-boot will be mentioned, let it time out and boot into Maemo.

After Boot

  • for usb control you should make sure that the interface is up on mobile (modprobe g_nokia && ifconfig usb0 192.168.2.16 up) and follow http://wiki.meego.com/ARM/N900/Tips_and_Tricks/N900_USB_Networking mind that there is instructions are silly and that you need to make sure your udev does not contain cdc_ether but cdc_eem, after that you should be able to connect to the n900 (given that your own usb0 is also up, which should be handled by nm)

  • It is recommended to edit the /etc/network/interfaces file on the mobile system to autoset usb0

auto usb0
iface usb0 inet static
       address 192.168.2.16
       netmask 255.255.255.0
       gateway 192.168.2.14
      up route del default
      up route add default gw  192.168.2.14
  • Note: using .16 is key, otherwise you will get SSH key clashes with maemo

Performance Tweaks

  • rm /usr/bin/nepomuk*; rm /usr/bin/akonadi*
  • Remove everything from /usr/share/autostart other than plasma-mobile
  • Switch widget style from Oxygen to Plastique
  • Switch off desktop effects
  • Deactivate man-db updates:

debconf-set-selections <<EOF
man-db man-db/auto-update boolean false
EOF
  • See packages the script below removes...

btrfs

Meego uses btrfs, and since we are using a SD card it makes sense that you convert your ext3 to btrfs.

Scripts

Setup

For your convenience here is a script. Note that you need to change the 2 first consts to match your mount path and your git checkout path. The script will copy the most essential bits into your chroot, install ssh, shoot some pointless packages in the head, set rendering to raster, deactivate some fat autostart apps and leave you with creating a user named user (i.e. you just need to set the pw).

# Copyright © 2010 Harald Sitter <apachelogger@ubuntu.com>

MPATH="/media/disk-2"
GITPATH="/home/me/src/git/meego/"

export LANG=C

cp $GITPATH/n900_udev-rules-nokia-n900/*rules $MPATH/etc/udev/rules.d/
cp $GITPATH/n900_nokia-n900-configs/nokia-n900-input-rules.conf $MPATH/etc/X11/xorg.conf
# comment line?
cp $GITPATH/n900_nokia-n900-configs/*.init $MPATH/etc/init.d/
# should be different path...
mkdir -p $MPATH/lib/kbd/keymaps/arm/qwerty
cp $GITPATH/n900_nokia-n900-configs/nokia-n900-keys.map $MPATH/lib/kbd/keymaps/arm/qwerty/
echo 'setxkbmap -rules evdev -model nokiarx51 -option grp:ctrl_shift_toggle -layout us -variant ",qwerty"' > $MPATH/etc/rc.local
echo 'exit 0' >> $MPATH/etc/rc.local

apt-get install qemu-arm-static
cp /usr/bin/qemu-arm-static $MPATH/usr/bin/qemu-arm-static
mount -o remount,dev $MPATH
for f in n900-alsamixer-settings.init nokia-n900-cmt-gpio.init nokia-n900-keys.init; do
  chroot $MPATH update-rc.d $f defaults 50 50
done

chroot $MPATH echo "nameserver 8.8.8.8" >> /etc/resolv.config
chroot $MPATH apt-get update
chroot $MPATH apt-get install openssh-server

chroot $MPATH apt-get purge libcups2 printer-applet jockey-kde apparmor plymouth-x11 ubiquity oem-config
# kdm -> nodm

chroot $MPATH echo "QT_GRAPHICSSYSTEM=raster" >> /etc/environment

mkdir -p $MPATH/usr/share/autostart-bak
for f in ; do
  mv $MPATH/usr/share/autostart/$f $MPATH/usr/share/autostart-bak/
done

chmod -x $MPATH/usr/bin/akonadi*
chmod -x $MPATH/usr/bin/*akonadi
chmod -x $MPATH/usr/bin/nepo*
chmod -x $MPATH/usr/bin/virtuoso*

chroot $MPATH adduser user 

CHROOT

This script mounts your mobile install with dev, proc and sys mounted (necessary to upgrade via chroot). Just call it with the partition device as argument (e.g. ./script.sh /dev/sdc1)

# Copyright © 2010 Harald Sitter <apachelogger@ubuntu.com>

if [[ "$@" == "" ]]; then
  echo "please define partition id as arg"
  exit 1
fi

sudo mount $@ /mnt 
sudo mount -o bind /dev /mnt/dev
sudo mount -o bind /dev/pts /mnt/dev/pts # necessary for do-release-upgrade
sudo mount -o bind /sys /mnt/sys
sudo mount -t proc /proc /mnt/proc
sudo chroot /mnt
sudo umount /mnt/dev/pts /mnt/dev /mnt/sys /mnt/proc
sudo umount /mnt

exit 0

Testing

GLES

Install packages from https://wiki.ubuntu.com/ARM/OMAP/Graphics then you can try the demo binaries as described on the same page. Note that Qt and probably also KDELibs and Plasma Mobile need rebuilding for GLES support.

GSM

Should be working with ofono, see http://wiki.maemo.org/User:Jebba/Ofono and http://wiki.maemo.org/User:Jebba/Fedora