ArchixSystemSoftware

Keybinding Markup

---
title: ArchixSystemSoftware
---

ChrUbuntu installation on Samsung Chromebook 2 XE503C12

[[_TOC_]]

# Resources

*   <https://wiki.debian.org/InstallingDebianOn/Samsung/ARMChromebook>

# linux-exynos

Status
:   [http://linux-exynos.org/wiki/Samsung\_Chromebook\_2_XE503C12][38]

Install
:   [http://linux-exynos.org/wiki/Samsung\_Chromebook\_2\_XE503C12/Installing\_Linux][39]

## chromeos kernel

*   <https://chromium.googlesource.com/chromiumos/third_party/kernel.git/+refs>

Attempting to build [release-R43-6946.B-chromeos-3.14][40]

Seems like chromeos kernels >= 3.10 [do not have exynos support][41]

# Boot Priority

Boot priority is set in the GPT table

cgpt add -i 6 -P 5 -T 1 -S  /dev/mmcblk0p6

[[$[Get Code]]][42]

# 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][43]

*   <https://blogofterje.wordpress.com/2012/01/14/optimizing-fs-on-sd-card/>

## 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

[[$[Get Code]]][44]

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

[[$[Get Code]]][49]

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

[[$[Get Code]]][50]

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

[[$[Get Code]]][52]

## 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

[[$[Get Code]]][55]

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

[[$[Get Code]]][62]

### 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)][65] and [Chromium (#283167)][66]

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  //'`

[38]: http://linux-exynos.org/wiki/Samsung_Chromebook_2_XE503C12
 [39]: http://linux-exynos.org/wiki/Samsung_Chromebook_2_XE503C12/Installing_Linux
 [40]: https://chromium.googlesource.com/chromiumos/third_party/kernel.git/+/release-R43-6946.B-chromeos-3.14
 [41]: https://chromium.googlesource.com/chromiumos/third_party/kernel.git/+/release-R43-6946.B-chromeos-3.10/chromeos/config/armel/
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 [43]: /Tech/FlashBench
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 [65]: https://github.com/dnschneid/crouton/issues/514
 [66]: http://code.google.com/p/chromium/issues/detail?id=283167
 [67]: ArchixSystemSoftware?action=sourceblock&num=18

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