ChrUbuntu installation on Samsung Chromebook 2 XE503C12
Resources
linux-exynos
Status : http://linux-exynos.org/wiki/Samsung_Chromebook_2_XE503C12
Install : http://linux-exynos.org/wiki/Samsung_Chromebook_2_XE503C12/Installing_Linux
chromeos kernel
Attempting to build release-R43-6946.B-chromeos-3.14
Seems like chromeos kernels >= 3.10 do not have exynos support
Boot Priority
Boot priority is set in the GPT table
cgpt add -i 6 -P 5 -T 1 -S /dev/mmcblk0p6
ChrUbuntu
After doing a reinstall on a USB stick, inexplicably succeeded in booting to the root partition on the internal eMMC!
SDHC
See Tech.FlashBench
Samsung 32GB
- Try 8MB partition start (16384s)
- Try 4KB ext4 blocksize
Sandisk 16GB
- Try 8MB partition start
- Try 4KB ext4 blocksize
- stride = 1
- stripe-width = (4MB / 4KB) = 1024
mkfs.ext4 -O ^has_journal -E stride=1,stripe-width=1024 -b 4096 -L archix-home /dev/sdi1
All sorts of corruption!
If I mount, create dir, unmount the fs is corrupted.
SDHC (Old)
Configure an SDHC containing an LVM2 volume group and a logical volume for /home
GPT
Attempting to use cryptsetup without a GPT resulted in corruption of the LUKS header at some point.
On a 32GB sdcard, create a 30GB partition, reserving the last 1440MB just in case.
sudo parted /dev/mmcblk1 mklabel gpt
sudo parted /dev/mmcblk1 mkpart primary 30G
sudo parted /dev/mmcblk1 mkpart primary 30G -- -1 # -- needed to pass -1 (end of disk)
Cryptsetup
No xts kernel module, so use cbc-essiv instead.
sudo cryptsetup -v luksFormat -c "aes-cbc-essiv:sha256" -s 256 /dev/mmcblk1p1
sudo cryptsetup luksOpen /dev/mmcblk1p1 crypt-sdhc
LVM2
LVM stack including 20G home directory. Reserving remaining 10G for later. Zeroing fails, so disable it when creating lvs.
sudo pvcreate /dev/mapper/crypt-sdhc
sudo vgcreate vg-sdhc /dev/mapper/crypt-sdhc
sudo vgchange -a y vg-sdhc
sudo lvcreate -Zn -n home -L20g vg-sdhc # disable zeroing as workaround
Filesystem
sudo mkfs.ext4 -m0 -L home /dev/vg-sdhc/home
NB: random crashes when accessing the SDHC. Probably shouldn't use ext4 journaling on an SD card.
sudo mkfs.ext4 -O has_journal -m0 -L home /dev/vg-sdhc/home
Post-creation use tune2fs -O ^has_journal DEV
fstab and crypttab
Leaving root on the eMMC for now while I evaluate the performance. Home is on the external SDHC.
/etc/crypttab
crypt-sdhc /dev/mmcblk1p1 none luks
/etc/fstab
proc /proc proc defaults 0 0
UUID=0f623493-6b40-42f5-bd99-bb37dd74b585 / auto errors=remount-ro 0 1
/dev/mapper/vg--sdhc-home /home ext4 noatime 0 2
System Config
Kernel Config
Reading the current kernel config
modprobe configs
zless /proc/config.gz
Username
sudo usermod -l myuser -d /home/myuser user
Hostname
sudo hostname "myhost"
sudo echo "myhost" > /etc/hostname
sudo vi /etc/hosts
127.0.0.1 localhost
127.0.1.1 archix archix.lan
Locale and Timezone
Set system locale to en_GB.UTF-8
sudo vi /etc/defaults/locale
LANG="en_GB.UTF-8"
sudo locale-gen en_GB.UTF-8
sudo dpkg-reconfigure tzdata
Keyboard Layout
Maps dvorak and uses Chromebook search key as compose. sudo vi /etc/defaults/keyboard
XKBMODEL="pc105"
XKBLAYOUT="us,gb,gb"
XKBVARIANT="dvorak,dvorak,"
XKBOPTIONS="compose:lwin"
Also
setxkbmap -option compose:lwin
Then
sudo dpkg-reconfigure console-data # select layout from full list
sudo dpkg-reconfigure console-setup # rebuilds initramfs with new settings
iptables ip6tables
Missing kernel modules x_tables, xt_limit, etc.
Hardware Configuration
Working
- Wifi 802.11bgn
- Touchpad
- Ethernet (my Asix USB2 gigabit adapter)
- Bluetooth
- Camera
Unconfirmed
- Sleep
- Is it actually sleeping?
- Lots of freezes overnight
- Many cases where battery has exhausted
Not Working
- Graphics hardware acceleration (Mali)
Mali Graphics Acceleration
New link: http://community.arm.com/docs/DOC-9494
With loopback and kpartx
dd if=/dev/zero of=mali.img bs=1k count=1M
# create partitions manually based on chromebook-setup.sh
sudo kpartx mali.img # creates /dev/loopXpY etc
# comment out options sanitising and storage formatting from script
./chromebook-setup.sh --variant=XE503C12 --storage=/dev/loop1p do_everything
Old instructions
- ARM Mali T628MP6
- Needs kernel support (present?)
- Needs custom built driver
sudo apt-get install xserver-xorg-video-armsoc
$[Get Code]60 provides
/etc/X11/xorg.conf.d/exynos.conf
Config from http://archlinuxarm.org/forum/viewtopic.php?f=47&t=7469&start=10
Section "Monitor"
Identifier "LVDS-1"
Option "DPMS" "standby"
#Option "DPMS" "false" #mw04/11/2013
Option "Enable" "True"
Option "Primary" "False"
Option "RightOf" "HDMI-1"
EndSection
Section "Monitor"
Identifier "HDMI-1"
Option "DPMS" "standby"
#Option "DPMS" "false" #mw04/11/2013
Option "Primary" "True"
Option "Enable" "True"
Option "DefaultMode" "1920x1080"
EndSection
Section "ServerLayout"
Identifier "ServerLayout0"
Option "BlankTime" "0"
Option "StandbyTime" "0"
Option "SuspendTime" "0"
Option "OffTime" "0"
#Option "OffTime" "30" #mw04/11/2013
EndSection
Section "Device"
Identifier "Mali FBDEV"
Driver "armsoc"
Option "fbdev" "/dev/fb0"
Option "DRI2" "true"
Option "DRI2_PAGE_FLIP" "false"
Option "DRI2_WAIT_VSYNC" "true"
Option "Fimg2DExa" "false"
# Option "Fimg2DExaSolid" "false"
# Option "Fimg2DExaCopy" "false"
# Option "Fimg2DExaComposite" "false"
Option "SWcursorLCD" "false"
EndSection
Section "Screen"
Identifier "DefaultScreen"
Device "Mali FBDEV"
DefaultDepth 24
SubSection "Display"
Modes "1920x1080"
EndSubSection
EndSection
Wifi
mwifiex_sdio
The driver creates three interfaces (mlan0, uap0 and p2p0).
Change the wicd preferences to use mlan0.
Prevent NetworkManager messing with uap0 and p2p0
Add uap0 and p2p0 to /etc/network/interfaces as manual interfaces:
vim /etc/network/interfaces.d/mwifiex-blacklist
# Prevent NetworkMangler from scanning these interfaces
#
iface uap0 inet manual
iface p2p0 inet manual
Sound
Needed to add the default user to the audio group:
sudo groupmod -a -G audio myuser
Speakers
Working with SDL only so far (mplayer).
Mute digital:
- "Digital EQ 3 Band"
- "Digital EQ 5 Band"
- "Digital EQ 7 Band"
Unmute Speaker DACs:
- "Left Speaker Mixer Left DAC" = 00
- "Left Speaker Mixer Right DAC" = 00
- "Right Speaker Mixer Left DAC" = 00
- "Right Speaker Mixer Right DAC" = 00
Working
- Headphone jack
- HDMI (via
lxrandr) - HDMI audio (via
lxrandr)
Kernel Upgrade
- http://www.chromium.org/chromium-os/how-tos-and-troubleshooting/kernel-configuration
- http://velvet-underscore.blogspot.co.uk/2013/01/chrubuntu-virtualbox-with-kvm.html
Arch Linux
http://archlinuxarm.org/platforms/armv7/samsung/samsung-chromebook-2
Back to Crouton
Finally irritated enough by constant freezes.
Install
Create a trusty chroot on the SD card
sudo mount -t ext4 /dev/mmcblk0p7 /mnt/0p7
sudo sh -e ~/Downloads/crouton -r trusty -t lxde -p /mnt/0p7
Obsolete Crouton stuff
Hostname
Changing the hostname breaks Xauth in Crouton (#514) and Chromium (#283167)
Add workaround to /etc/rc.local:
xauth -f /var/host/Xauthority add : MIT-MAGIC-COOKIE-1 \
`xauth -f /var/host/Xauthority list | sed -e 's/.* MIT-MAGIC-COOKIE-1 //'`