Difference between revisions of "Parallella Linaro Nano"

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= How to Install Linaro nano 14.03 (minimal headless system) =
+
= How to Install Linaro Saucy Nano (minimal headless system) =
  
−
Copied here from [http://forums.parallella.org/viewtopic.php?f=9&t=844&start=10#p5989 Shodruk's forum post].
 
 
== Requirements ==
 
== Requirements ==
  
−
Ubuntu PC, SD Card, SD Card adapter, Parallella
+
Ubuntu PC, SD Card, SD Card adapter, Parallella board
  
 
On the PC's terminal:
 
On the PC's terminal:
Line 10: Line 9:
 
== Download the files ==
 
== Download the files ==
  
−
<pre>
+
Find the kernel tarball and the FPGA bitstream file that are suitable for your board.
−
wget -O rel.14.02.06.tgz https://github.com/parallella/parallella-bin/blob/master/rel.14.02.06.tgz?raw=true
 
  
−
wget http://releases.linaro.org/14.03/ubuntu/saucy-images/nano/linaro-saucy-nano-20140323-649.tar.gz
+
http://www.parallella.org/create-sdcard/
−
</pre>
 
  
−
<pre>md5sum rel.14.02.06.tgz</pre>
+
Note: If you want to use "headless bitstream" and "headless kernel", first install Linaro using "HDMI bitstream" and "HDMI kernel", then replace them with the headless one. (A HDMI monitor and a keyboard are needed for installing process.)<br>
 +
These files are in the partition 1 (FAT32), so you can easily replace them using ordinary PC.
  
−
<blockquote>
 
 
<pre>
 
<pre>
−
23eb538fd58d684b5a64236e81275dc8  rel.14.02.06.tgz
+
wget --no-check-certificate https://[THE_URL_OF_THE_KERNEL_TARBALL]
 +
 
 +
wget --no-check-certificate -O parallella.bit.bin https://[THE_URL_OF_THE_BITSTREAM]
 +
 
 +
wget http://releases.linaro.org/14.04/ubuntu/saucy-images/nano/linaro-saucy-nano-20140410-652.tar.gz
 
</pre>
 
</pre>
−
</blockquote>
 
  
−
<pre>md5sum linaro-saucy-nano-20140323-649.tar.gz</pre>
+
<pre>md5sum linaro-saucy-nano-20140410-652.tar.gz</pre>
  
 
<blockquote>
 
<blockquote>
 
<pre>
 
<pre>
−
0bb79433fc2018c1b5ff6da9d9f970c7 linaro-saucy-nano-20140323-649.tar.gz
+
cded44187fb762ba7ea7b1ee092a0998 linaro-saucy-nano-20140410-652.tar.gz
 
</pre>
 
</pre>
 
</blockquote>
 
</blockquote>
−
 
  
 
== Determine the device name of the SD Card ==
 
== Determine the device name of the SD Card ==
Line 55: Line 54:
  
 
"/dev/sdX" is the device name of the SD Card<br />
 
"/dev/sdX" is the device name of the SD Card<br />
−
(e.g. sdb, sdc, sdd, sde, mmcblk0, mmcblk1, ... and, Beware! Don't partition HDD!!!)
+
(e.g. sdb, sdc, sdd, sde, mmcblk0, mmcblk1, ... and, Beware! Don't partition HDD!!!)<br />
 +
sdX : an example of the device name (e.g. sde, mmcblk0)<br />
 +
sdX1 : partition 1 of the device (e.g. sde1, mmcblk0p1)<br />
 +
sdX2 : partition 2 of the device (e.g. sde2, mmcblk0p2)<br />
  
 
== Partition the SD Card ==
 
== Partition the SD Card ==
Line 80: Line 82:
  
 
<pre>
 
<pre>
−
(parted) rm 2
+
(parted) mklabel msdos
−
(parted) rm 1
+
Warning: The existing disk label on /dev/sdX will be destroyed
 +
and all data on this disk will be lost. Do you want to continue?
 +
Yes/No? yes
 
</pre>
 
</pre>
  
Line 87: Line 91:
  
 
<pre>
 
<pre>
−
(parted) mkpart p fat32 2048s 100m
+
(parted) mkpart p fat32 2048s 256MB
−
(parted) mkpart p ext2 100m -1m
+
(parted) mkpart p ext2 256MB -2MB
 
(parted) q
 
(parted) q
 
</pre>
 
</pre>
Line 101: Line 105:
 
<pre>
 
<pre>
 
Device Boot Start End Blocks Id System
 
Device Boot Start End Blocks Id System
−
/dev/sdX1 2048 194559 96256 c W95 FAT32 (LBA)
+
/dev/sdX1 2048 499711 248832 c W95 FAT32 (LBA)
−
/dev/sdX2 194560 3987455 1896448 83 Linux
+
/dev/sdX2 499712 3887103 1693696 83 Linux
 
</pre>
 
</pre>
 
</blockquote>
 
</blockquote>
Line 117: Line 121:
 
<pre>
 
<pre>
 
sudo mkdir /tmp/mnt1 /tmp/mnt2
 
sudo mkdir /tmp/mnt1 /tmp/mnt2
−
sudo mount /dev/sdX2 /tmp/mnt1
+
sudo mount /dev/sdX2 /tmp/mnt2
−
sudo tar --strip-components=1 -C /tmp/mnt1 -xzpf linaro-saucy-nano-20140323-649.tar.gz
+
sudo tar --strip-components=1 -C /tmp/mnt2 -xzpf linaro-saucy-nano-20140410-652.tar.gz
 
sudo sync
 
sudo sync
−
sudo umount /tmp/mnt1
+
sudo umount /tmp/mnt2
 
</pre>
 
</pre>
  
Line 126: Line 130:
  
 
<pre>
 
<pre>
−
sudo mount -o umask=000 -t vfat /dev/sdX1 /tmp/mnt2
+
sudo mount -o umask=000 -t vfat /dev/sdX1 /tmp/mnt1
−
sudo tar -C /tmp/mnt2 -xzf rel.14.02.06.tgz
+
sudo tar --no-same-owner -C /tmp/mnt1 -xzf [THE_FILENAME_OF_THE_KERNEL_TARBALL]
−
</pre>
+
sudo cp parallella.bit.bin /tmp/mnt1/
−
(The warning "Cannot change ownership..." can be ignored.)
 
−
<pre>
 
 
sudo sync
 
sudo sync
−
sudo umount /tmp/mnt2
+
sudo umount /tmp/mnt1
 
</pre>
 
</pre>
  
Line 139: Line 141:
 
==== Preventing to install unnecessary packages ====
 
==== Preventing to install unnecessary packages ====
 
<pre>
 
<pre>
−
sudo mount /dev/sdX2 /tmp/mnt1
+
sudo mount /dev/sdX2 /tmp/mnt2
−
sudo nano /tmp/mnt1/etc/apt/apt.conf.d/00InstallRecommends
+
sudo nano /tmp/mnt2/etc/apt/apt.conf.d/00InstallRecommends
 
</pre>
 
</pre>
 
(Edit and save.)
 
(Edit and save.)
Line 154: Line 156:
  
 
<pre>
 
<pre>
−
sudo nano /tmp/mnt1/etc/network/interfaces
+
sudo nano /tmp/mnt2/etc/network/interfaces
 
</pre>
 
</pre>
 
(Edit and save.)
 
(Edit and save.)
Line 175: Line 177:
 
# If you prefer DHCP, comment out the above 5 lines, uncomment the below.
 
# If you prefer DHCP, comment out the above 5 lines, uncomment the below.
 
#iface eth0 inet dhcp
 
#iface eth0 inet dhcp
 +
#  up sleep 3; mii-tool -F 1000baseT-FD
 
</pre>
 
</pre>
 
</blockquote>
 
</blockquote>
−
 
+
NOTE: Linaro Quantal and Linaro Raring would not boot if "source-directory /etc/network/interfaces.d" was left in the file. --[[User:Gamedrummer|Gamedrummer]] ([[User talk:Gamedrummer|talk]]) 14:08, 10 July 2014 (UTC)
 
<pre>
 
<pre>
−
sudo nano /tmp/mnt1/etc/resolv.conf
+
sudo nano /tmp/mnt2/etc/resolv.conf
 
</pre>
 
</pre>
  
Line 190: Line 193:
 
<pre>
 
<pre>
 
sudo sync
 
sudo sync
−
sudo umount /tmp/mnt1
+
sudo umount /tmp/mnt2
 
</pre>
 
</pre>
  
Line 271: Line 274:
 
sudo apt-get install build-essential man-db manpages-dev git libmpc-dev libmpc2 libgmp3-dev libmpfr-dev ca-certificates
 
sudo apt-get install build-essential man-db manpages-dev git libmpc-dev libmpc2 libgmp3-dev libmpfr-dev ca-certificates
  
−
wget ftp://ftp.parallella.org/esdk/esdk.5.13.09.10_linux_armv7l.tgz
+
wget http://ftp.parallella.org/esdk/esdk.5.13.09.10_linux_armv7l.tgz
  
 
md5sum esdk.5.13.09.10_linux_armv7l.tgz  
 
md5sum esdk.5.13.09.10_linux_armv7l.tgz  
Line 318: Line 321:
 
sudo mknod -m 660 /dev/mmcblk0p2 b 179 2
 
sudo mknod -m 660 /dev/mmcblk0p2 b 179 2
  
−
sudo apt-get install device-tree-compiler
+
sudo apt-get install device-tree-compiler nano
  
 
sudo mount /dev/mmcblk0p1 /mnt
 
sudo mount /dev/mmcblk0p1 /mnt
Line 324: Line 327:
 
sudo cp devicetree.dtb devicetree.dtb.bak
 
sudo cp devicetree.dtb devicetree.dtb.bak
  
−
sudo wget https://raw.githubusercontent.com/parallella/parallella-linux-adi/xcomm_zynq/arch/arm/boot/dts/zynq-parallella.dts
+
sudo dtc -I dtb -O dts -o devicetree.dts devicetree.dtb
  
−
sudo mv zynq-parallella.dts devicetree.dts
 
 
sudo nano devicetree.dts
 
sudo nano devicetree.dts
 
</pre>
 
</pre>
Line 332: Line 334:
 
<blockquote>
 
<blockquote>
 
<pre>
 
<pre>
−
bootargs = "root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait devtmpfs.mount=1";
+
bootargs = "root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait";
 
</pre>
 
</pre>
 
</blockquote>
 
</blockquote>
  
 
<pre>
 
<pre>
−
sudo dtc -I dts devicetree.dts -O dtb -o devicetree.dtb
+
sudo dtc -I dts -O dtb -o devicetree.dtb devicetree.dts
 
cd /
 
cd /
 
sync
 
sync
Line 345: Line 347:
 
That's all! Below are installation instructions of lightweight desktop environment.
 
That's all! Below are installation instructions of lightweight desktop environment.
  
−
= How to Install X environment to minimal headless system =
+
= How to Install lightweight X environment =
  
 
Demo video:
 
Demo video:
Line 353: Line 355:
  
 
<pre>
 
<pre>
−
sudo apt-get install lxde xserver-xorg xinit alsa-base alsa-utils libasound2-plugins feh galculator xserver-xorg-video-fbdev xserver-xorg-video-modesetting x11-xserver-utils
+
sudo apt-get install alsa-base alsa-utils libasound2-plugins lxde x11-xserver-utils xserver-xorg xserver-xorg-video-fbdev xserver-xorg-video-modesetting feh xinit
 
</pre>
 
</pre>
  
Line 375: Line 377:
 
<blockquote>
 
<blockquote>
 
<pre>
 
<pre>
−
@feh --bg-scale /home/linaro/background.png
+
@feh --bg-fill /home/linaro/background.png
 
</pre>
 
</pre>
 
</blockquote>
 
</blockquote>
Line 459: Line 461:
 
</pre>
 
</pre>
  
−
==== Using a RAM disk for cache ====
+
==== Speed up Firefox ====
−
 
 
−
<pre>
 
−
sudo nano /etc/fstab
 
−
</pre>
 
−
(Add this line to the bottom of the file)
 
−
<blockquote>
 
−
<pre>
 
−
tmpfs /home/linaro/.cache tmpfs noatime,nodev,nosuid,size=100M 0 0
 
−
</pre>
 
−
</blockquote>
 
  
−
==== Limit the cache size of Firefox ====
+
Launch Firefox, Type "about:config" in the URL bar, Type "browser.cache.disk.enable" in the "Search:" bar, Change the value true->false by double-clicking.
−
On Firefox,<br />
 
−
MENU->Edit->Preferences->Advanced->Network->Cached Web Content<br />
 
−
[v]Override automatic cache management<br />
 
−
Limit cache to [50] MB of space<br />
 
  
−
==== More responsive mouse wheel ====
+
Type "mousewheel.acceleration.start" in the "Search:" bar, Double click, set [2].
−
On Firefox,<br />
 
−
Type "about:config" in URL bar,<br />
 
−
mousewheel.acceleration.start : Double click, set [2]<br />
 
  
 
==== Install media player ====
 
==== Install media player ====
Line 491: Line 476:
 
Options->Preferences->Video->Output driver: x11<br />
 
Options->Preferences->Video->Output driver: x11<br />
 
Options->Preferences->Audio->Output driver: alsa<br />
 
Options->Preferences->Audio->Output driver: alsa<br />
 +
 +
==== How to force framebuffer resolution to 1280x720 ====
 +
This increases desktop performance on a full-HD monitor.<br />
 +
<br />
 +
The preferred resolution is 1280x720, however you can set another resolution.<br />
 +
<br />
 +
To check the available resolutions, type this command on a terminal. (with HDMI connected, on native X Window, not in ssh)<br />
 +
 +
<pre>
 +
cat /sys/class/drm/card0-HDMI-A-1/modes
 +
</pre>
 +
 +
'''Note: The resolution settings of the xorg.conf (Modes "1280x720") must match with the bootargs settings (video=HDMI-A-1:1280x720).'''
 +
 +
Edit bootargs and update dtb file.<br />
 +
How to: [[Parallella_Linaro_Nano#Enable_devtmpfs]]
 +
<pre>
 +
bootargs = "root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait video=HDMI-A-1:1280x720";
 +
</pre>
 +
Edit xorg.conf<br />
 +
How to: [[Parallella_Linaro_Nano#xorg_configuration]]
 +
<pre>
 +
Modes "1280x720"
 +
# In the Section "Screen"
 +
</pre>
 +
 +
{{Template:Parallella Navbox}}

Latest revision as of 23:45, 17 January 2015

How to Install Linaro Saucy Nano (minimal headless system)

Requirements

Ubuntu PC, SD Card, SD Card adapter, Parallella board

On the PC's terminal:

Download the files

Find the kernel tarball and the FPGA bitstream file that are suitable for your board.

http://www.parallella.org/create-sdcard/

Note: If you want to use "headless bitstream" and "headless kernel", first install Linaro using "HDMI bitstream" and "HDMI kernel", then replace them with the headless one. (A HDMI monitor and a keyboard are needed for installing process.)
These files are in the partition 1 (FAT32), so you can easily replace them using ordinary PC. 

wget --no-check-certificate https://[THE_URL_OF_THE_KERNEL_TARBALL]

wget --no-check-certificate -O parallella.bit.bin https://[THE_URL_OF_THE_BITSTREAM]

wget http://releases.linaro.org/14.04/ubuntu/saucy-images/nano/linaro-saucy-nano-20140410-652.tar.gz

md5sum linaro-saucy-nano-20140410-652.tar.gz
cded44187fb762ba7ea7b1ee092a0998  linaro-saucy-nano-20140410-652.tar.gz

Determine the device name of the SD Card

sudo parted -l

In case of a 2GB SD Card: 

Model: SD/MM Reader
Disk /dev/sdX: 2042MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 1049kB 49.3MB 48.2MB primary fat16
2 49.3MB 2042MB 1992MB primary ext4

"/dev/sdX" is the device name of the SD Card
(e.g. sdb, sdc, sdd, sde, mmcblk0, mmcblk1, ... and, Beware! Don't partition HDD!!!)
sdX : an example of the device name (e.g. sde, mmcblk0)
sdX1 : partition 1 of the device (e.g. sde1, mmcblk0p1)
sdX2 : partition 2 of the device (e.g. sde2, mmcblk0p2)

Partition the SD Card

Unmount the SD Card if it was automounted, then, 

sudo parted -a optimal /dev/sdX

(parted) print

If there are two partitions on the SD Card, 

Number Start End Size Type File system Flags
1 1049kB 99.6MB 98.6MB primary fat16 lba
2 99.6MB 2042MB 1942MB primary

Delete all existing partition 

(parted) mklabel msdos
Warning: The existing disk label on /dev/sdX will be destroyed
and all data on this disk will be lost. Do you want to continue?
Yes/No? yes

Make new partitions 

(parted) mkpart p fat32 2048s 256MB
(parted) mkpart p ext2 256MB -2MB
(parted) q

Check the partition 

sudo fdisk -l /dev/sdX

Device Boot Start End Blocks Id System
/dev/sdX1 2048 499711 248832 c W95 FAT32 (LBA)
/dev/sdX2 499712 3887103 1693696 83 Linux

Format the partition 

sudo mkfs.vfat -n BOOT /dev/sdX1
sudo mkfs.ext4 -L rootfs /dev/sdX2

Extract rootfs

sudo mkdir /tmp/mnt1 /tmp/mnt2
sudo mount /dev/sdX2 /tmp/mnt2
sudo tar --strip-components=1 -C /tmp/mnt2 -xzpf linaro-saucy-nano-20140410-652.tar.gz
sudo sync
sudo umount /tmp/mnt2

Extract BOOT partition

sudo mount -o umask=000 -t vfat /dev/sdX1 /tmp/mnt1
sudo tar --no-same-owner -C /tmp/mnt1 -xzf [THE_FILENAME_OF_THE_KERNEL_TARBALL]
sudo cp parallella.bit.bin /tmp/mnt1/
sudo sync
sudo umount /tmp/mnt1

Edit some configuration files

Preventing to install unnecessary packages

sudo mount /dev/sdX2 /tmp/mnt2
sudo nano /tmp/mnt2/etc/apt/apt.conf.d/00InstallRecommends

(Edit and save.) 

APT::Install-Recommends "false";

Network configuration

If your router's IP address is 192.168.0.1 and the Parallella's IP address is 192.168.0.2, 

sudo nano /tmp/mnt2/etc/network/interfaces

(Edit and save.) 

source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

auto eth0

# static network settings
iface eth0 inet static
   address 192.168.0.2
   netmask 255.255.255.0
   gateway 192.168.0.1
   up sleep 3; mii-tool -F 1000baseT-FD

# If you prefer DHCP, comment out the above 5 lines, uncomment the below.
#iface eth0 inet dhcp
#   up sleep 3; mii-tool -F 1000baseT-FD

NOTE: Linaro Quantal and Linaro Raring would not boot if "source-directory /etc/network/interfaces.d" was left in the file. --Gamedrummer (talk) 14:08, 10 July 2014 (UTC) 

sudo nano /tmp/mnt2/etc/resolv.conf

nameserver 192.168.0.1

sudo sync
sudo umount /tmp/mnt2

Insert the SD Card to the Parallella,
power-on,
Wait 30 seconds,
You'll see a root terminal.
If it doesn't boot, press the reset button and try again.

Install openssh-server

On the Parallella: 

apt-get update
apt-get install openssh-server
sync

Now you can login the Parallella from your PC.
On the PC, 

ssh linaro@192.168.0.2
password: linaro

Create device nodes

sudo mknod -m 600 /dev/ttyPS0 c 251 0
sudo chown root:tty /dev/ttyPS0

Let's see how lightweight it is

free

             total       used       free     shared    buffers     cached
Mem:        992452      38356     954096          0       1816      13076
-/+ buffers/cache:      23464     968988
Swap:            0          0          0

The memory consumption is only 23MB !! :D 

df

Filesystem     1K-blocks   Used Available Use% Mounted on
/dev/root       30348232 311108  28472452   2% /
none               99248     68     99180   1% /run
none                5120      0      5120   0% /run/lock
none              496224      0    496224   0% /run/shm
none              102400      0    102400   0% /run/user

The disk consumption is only 304MB !!

Additional Installation

Recommended Packages

sudo apt-get install vim-tiny nano fake-hwclock wget less unzip

Epiphany SDK

sudo apt-get install build-essential man-db manpages-dev git libmpc-dev libmpc2 libgmp3-dev libmpfr-dev ca-certificates

wget http://ftp.parallella.org/esdk/esdk.5.13.09.10_linux_armv7l.tgz

md5sum esdk.5.13.09.10_linux_armv7l.tgz 

52e3b60185c882c7641115993b6a72b5  esdk.5.13.09.10_linux_armv7l.tgz

sudo mkdir -p /opt/adapteva/
sudo tar xzf esdk.5.13.09.10_linux_armv7l.tgz -C /opt/adapteva/
sudo ln -sTf /opt/adapteva/esdk.5.13.09.10 /opt/adapteva/esdk

touch ~/.nano_history
nano ~/.bashrc

(add to the bottom of the file) 

EPIPHANY_HOME=/opt/adapteva/esdk
. ${EPIPHANY_HOME}/setup.sh

Disable sshd hostname look-up

(To fix slow SSH connections) 

sudo nano /etc/ssh/sshd_config

(add to the bottom of the file) 

UseDNS no

Enable devtmpfs

(and disable serial console: they are incompatible) 

sudo mknod -m 660 /dev/mmcblk0 b 179 0
sudo mknod -m 660 /dev/mmcblk0p1 b 179 1
sudo mknod -m 660 /dev/mmcblk0p2 b 179 2

sudo apt-get install device-tree-compiler nano

sudo mount /dev/mmcblk0p1 /mnt
cd /mnt
sudo cp devicetree.dtb devicetree.dtb.bak

sudo dtc -I dtb -O dts -o devicetree.dts devicetree.dtb

sudo nano devicetree.dts

(Search and Edit the "bootargs" line) 

bootargs = "root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait";

sudo dtc -I dts -O dtb -o devicetree.dtb devicetree.dts
cd /
sync
sudo reboot

That's all! Below are installation instructions of lightweight desktop environment.

How to Install lightweight X environment

Demo video: http://youtu.be/6gpM57qB-I8

Install LXDE

sudo apt-get install alsa-base alsa-utils libasound2-plugins lxde x11-xserver-utils xserver-xorg xserver-xorg-video-fbdev xserver-xorg-video-modesetting feh xinit

Disable PCManFM Desktop mode

(for faster displaying) 

sudo nano /etc/xdg/lxsession/LXDE/autostart

(Delete the line "@pcmanfm --desktop --profile LXDE" and save.)

Set a background image

Put a background image file in your home directory.
(e.g. /home/linaro/background.png)

sudo nano /etc/xdg/lxsession/LXDE/autostart

(Append this line to the bottom of the file) 

@feh --bg-fill /home/linaro/background.png

xorg configuration

sudo nano /etc/X11/xorg.conf

Section "Device"
  Identifier "Card0"
  Driver "modesetting"
  Option "ShadowFB" "True"
  Option "SWCursor" "True"
  Option "HWCursor" "False"
EndSection
Section "Screen"
  Identifier "Screen0"
  Device "Card0"
  SubSection "Display"
#---- Uncomment your preferred mode ----
    #Modes "1920x1200"
    #Modes "1920x1080"
    #Modes "1280x720"
    #Modes "640x480"
  EndSubSection
EndSection

ALSA configuration

nano ~/.asoundrc

(copy, paste and save) 

pcm.!default {
 type rate
 slave {
  pcm "hw:0"
  rate 48000
 }
 converter "samplerate"
}

sync
sudo reboot

How to login as a normal user

After booting, press Ctrl+Alt+F2 

login: linaro
Password: linaro

Or, (easier way)
In the root prompt,

su linaro
cd

Start X environment

startx

Install Firefox

sudo apt-get install firefox

Speed up Firefox

Launch Firefox, Type "about:config" in the URL bar, Type "browser.cache.disk.enable" in the "Search:" bar, Change the value true->false by double-clicking.

Type "mousewheel.acceleration.start" in the "Search:" bar, Double click, set [2].

Install media player

sudo apt-get install smplayer

Launch smplayer,
Options->Preferences->Video->Output driver: x11
Options->Preferences->Audio->Output driver: alsa

How to force framebuffer resolution to 1280x720

This increases desktop performance on a full-HD monitor.

The preferred resolution is 1280x720, however you can set another resolution.

To check the available resolutions, type this command on a terminal. (with HDMI connected, on native X Window, not in ssh)

cat /sys/class/drm/card0-HDMI-A-1/modes

Note: The resolution settings of the xorg.conf (Modes "1280x720") must match with the bootargs settings (video=HDMI-A-1:1280x720).

Edit bootargs and update dtb file.
How to: Parallella_Linaro_Nano#Enable_devtmpfs 

bootargs = "root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait video=HDMI-A-1:1280x720";

Edit xorg.conf
How to: Parallella_Linaro_Nano#xorg_configuration 

Modes "1280x720"
# In the Section "Screen"
 
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