From Fedora Project Wiki

Fedora 21 Alpha for ARM

This is pre-release software and not intended for general use.

The Alpha release contains all the exciting features of Fedora 21's products in a form that anyone can help test. This testing, guided by the Fedora QA team, helps us target and identify bugs. When these bugs are fixed, we make a Beta release available. A Beta release is code-complete and bears a very strong resemblance to the third and final release. The final release of Fedora 21 is expected in December.

We need your help to make Fedora 21 the best release yet, so please take some time to download and try out the Alpha and make sure the things that are important to you are working. If you find a bug, please report it – every bug you uncover is a chance to improve the experience for millions of Fedora users worldwide. Together, we can make Fedora a rock-solid distribution. We have a culture of coordinating new features and pushing fixes upstream as much as feasible and your feedback will help improve not only Fedora but Linux and free software on the whole. (See the end of this announcement for more information on how to help.)

Download the Disk Image & Copy to Media

The image-based installation process involves downloading an image file (depending upon desktop/non-desktop option desired), inserting removable media into a "host" system (e.g. an ARM or x86_64 PC class desktop, laptop, etc.) and performing a few simple commands to write this image onto the media. This media is then used by the ARM "target" system to boot the Fedora 21 Alpha environment.

After writing the image and correct U-boot file(s), insert the media into the target platform and boot.


The examples provided here are from a Fedora 19/20 host and may need to be adjusted depending on your host environment.

Execute the following script as a user with sudo privileges. It will copy the selected disk image and write the appropriate U-Boot for the target hardware platform. Optionally you can also enable and disable SE Linux and remove the root password requirement (allowing log in without completing initial setup). To add a board not listed, simply create a bash scriptlet with the commands needed to copy U-Boot to media and add to the 'boards.d' directory.


Usage: <options>

   --image=IMAGE    - raw image file name
   --target=TARGET  - target board
   --media=DEVICE   - media device file (/dev/[sdX|mmcblkX])
   --selinux=ON/OFF - Turn SELinux off/on as needed
   --norootpass     - Remove the root password
    -y		    - Assumes yes, will not wait for confirmation
   --version	    - Display version and exit

Example: --image=Fedora-21 Alpha.xz --target=panda --media=/dev/mmcblk0 --selinux=OFF


Choose a disk image.

Write the image to your media

USER=  # your username 
TYPE=  # options include KDE, LXDE, XFCE, SoaS, Mate and Minimal
MEDIA= #/dev/<location-of-your-media 
xzcat Fedora-$TYPE-armhfp-21_Alpha-1-sda.raw.xz | sudo dd of=$MEDIA; sync

After writing the image, read the new partition table and mount the root partition

partprobe $MEDIA
mkdir /tmp/root; sudo mount /dev/<media-location> /tmp/root

Copy the appropriate U-Boot files for your target hardware listed below.

Write U-Boot to Media

Follow theses steps to write the appropriate U-Boot for your Hardware.

For the CubieTruck (Allwinner A20)

sudo dd if=/tmp/root/usr/share/uboot/Cubietruck/u-boot-sunxi-with-spl.bin of=/dev/<media-location> bs=1024 seek=8 conv=fsync,notrunc

Media should now be ready to boot on the Cubietruck. Insert into the device and boot.

For the BeagleBone ( Black & White )

At this time you must have a serial console cable for the BeagleBone. For those that do not, please see the FAQ at the bottom of the page
sudo dd if=/tmp/root/usr/share/uboot/beaglebone/MLO of=/dev/<media-location> count=1 seek=1 conv=notrunc bs=128k
sudo dd if=/tmp/root/usr/share/uboot/beaglebone/u-boot.img of=/dev/<media-location> count=2 seek=1 conv=notrunc bs=384k

Media should now be ready to boot on the BeagleBone. Insert into the device and boot.

For the CompuLab TrimSlice

You must use the latest Device Tree enabled U-Boot to boot the Fedora 20 Trimslice image, which you can find here. And environmental variables described here. Failure to do so will result in a non-booting system.

The Trimslice requires no additional steps, U-Boot is included on the device.

For the Wandboard (Freescale i.MX6)

Note - The Wandboard includes a Solo, Dual, and Quad core configuration. Determine your hardware configuration and use the appropriate value. While the Wandboard Quad has been tested and confirmed working, the Solo and Dual core models should also work as well. The Wandboard Solo uses the same dtb as the Dual(imx6dl-wandboard.dtb). Copy the U-boot for the Wandboard hardware in use:

BOARD= # Choose 'solo', 'dl' or 'quad'
 sudo dd if=/tmp/root/usr/share/uboot/wandboard__$BOARD/u-boot.imx of=/dev/<location-of-your-media> bs=1k seek=1 conv=fsync; sync

Remove the media and insert into the Wandboard and boot.

MicroSD for booting is located under the heatsink

For the Pandaboard

sudo dd if=/tmp/root/usr/share/uboot/panda/MLO of=/dev/<location-of-your-media> count=1 seek=1 conv=notrunc bs=128k
sudo dd if=/tmp/root/usr/share/uboot/panda/u-boot.img of=/dev/<location-of-your-media> count=2 seek=1 conv=notrunc bs=384k

Media should now be ready to boot on the Pandaboard. Insert into the device and boot.

For Versatile Express Emulation with QEMU

No ARM hardware? No problem! Even without hardware, it is possible to run the Fedora for ARM images using the QEMU emulator program. Any image can be used, and you can choose a script method or manual depending on your preference.

Using an Existing Disk Image

Choose a disk image.

Extract the image:

USER= # your username 
TYPE= # Type of image used. (eg Minimal, KDE, Xfce, SoaS, MATE)
unxz Fedora-$TYPE-armhfp-21_Alpha-1-sda.raw.xz 

Install 'libguestfs-tools' to use virt-copy

sudo yum install -y libguestfs-tools

Extract the kernel and initramfs for use with booting.

virt-copy-out -a Fedora-$TYPE-armhfp-21_Alpha-1-sda.raw /boot .

To boot (you will need to determine the kernel version used in the disk image):

KERN= # kernel version
INITRD= # initrd version
sudo qemu-system-arm -machine vexpress-a9 -m 1024 -nographic -net nic -net user \
 -append "console=ttyAMA0,115200n8 rw root=/dev/mmcblk0p3 rootwait physmap.enabled=0" \
 -kernel $KERN \
 -initrd $INTRD \
 -sd Fedora-$TYPE-armhfp-21_Alpha-1-sda.raw \

For convenience you can also download a script for booting the system here. To run the script:

chmod 755 boot-vexpress
./boot-vexpress -h
Usage: ./boot-vexpress [--gui] --kernel=vmlinuz... --ramfs=initramfs --image=fsimage [--dtb=vexpress.dtb]

Booting with device tree is possible, although passing --gui for graphics will not work at this time (this is due to ongoing platform reword occurring within the Versatile Express kernel code).

Expanding the Disk Image

You can easily expand the root partition of the disk image using qemu-img.

For example to increase the image size by 10GB you can issue:

 qemu-img resize ./file.img +10G

Interactive Network Installation

Fedora 21 Alpha offers the ability to perform a network installation using either 'vexpress-a15' or 'vexpress-a9'. Using 'vexpress-a15' will allow you to leverage more RAM using the LPAE kernel.

# vexpress-a15
# Create the disk image
qemu-img create Fedora-QEMU-armhfp-21_Alpha-1-sda.raw $SIZE #add a size EG 8G
# retrieve DTB 
# Begin Install
sudo virt-install --name Fedora-QEMU-armhfp-21_Alpha-1 \
--ram 2048         \
--arch armv7l      \
--machine vexpress-a15 \
--location= \
--disk Fedora-QEMU-armhfp-21_Alpha-1-sda.raw \
--extra-args="console=ttyAMA0 rw" \
--os-variant fedora20             \
--graphics none \
--boot dtb=`pwd`/vexpress-v2p-ca15-tc1.dtb

# vexpress-a9
# Create the disk image
sudo qemu-img create Fedora-QEMU-armhfp-21_Alpha-1-sda.raw $SIZE #add a size EG 8G
# retrieve DTB
# Begin Install
sudo virt-install \
--name Fedora-QEMU-armhfp-21_Alpha-1 \
--ram 1024 \
--arch armv7l      \
--machine vexpress-a9 \
--location= \
--disk Fedora-QEMU-armhfp-21_Alpha-1-sda.raw \
--extra-args="console=ttyAMA0 rw" \
--os-variant fedora20             \
--graphics none \
--boot dtb=`pwd`/vexpress-v2p-ca9.dtb 

Complete a Text or VNC Installation choosing a software packge and partitioning scheme (note when choosing LVM or BTRFS you will need to edit the kernel arguments appropriately). The system will attempt to reboot but fail until the next step is completed.

Extracting Files from the Disk Image

Once completed you will need to copy the kernel and initramfs and DTB from the disk image for use with Virt-Manager or command line.

KERN= # kernel version
INITRD= # initrd version
sudo virt-copy-out -a Fedora-QEMU-armhfp-21_Alpha-1-sda.raw /boot/{$KERN,$INITRD} .
# vexpress-a15
sudo virt-copy-out -a Fedora-QEMU-armhfp-21_Alpha-1-sda.raw /boot/dtb-*/vexpress-v2p-ca15-tc1.dtb .
# vexpress-a9
sudo virt-copy-out -a Fedora-QEMU-armhfp-21_Alpha-1-sda.raw /boot/dtb-*/vexpress-v2p-ca9.dtb .

Booting the New System

Once the files have been extracted you can choose to use the system on commandline or with Virt-Manager. Virt-Manager offers additional flexibility and is recommended for most users.


  • Open Virt-Manager and select the image created above. Click on "Edit-> Virtual Machine Details -> View -> Details"
  • Under "Boot Options", add the kernel, initramfs and dtb extracted above (the DTB should point to the correct path)
  • For kernel args add (note- if custom partitioning was used for the installation you will to make adjustments to 'root='):
# If you selected Standard Partitioning
console=ttyAMA0,115200n8 rw root=/dev/vda3 rootwait
# If you selected LVM
console=ttyAMA0,115200n8 rw root=/dev/mapper/fedora-root rootwait
  • When using the A15 DTB and LPAE kernel it is possible to use more RAM.

Booting for the First Time


  • During the first boot the system will launch the 'initial-setup' utility. For graphical images this will occur on the display, for minimal images this will occur on the serial console. Failure to complete the initial-setup will prevent logging into the system. To log in to the root account without completing the initial-setup you will need to minimally edit '/etc/passwd' file and remove the 'x' from the line beginning with 'root' (this will allow you to log into the root account without entering a password).

Resize the Root Filesystem

To resize the root partition use 'gparted' on a Fedora host.

Known Issues & Usage Tips

  • Display is currently not working on all target hardware platforms. Display is only working in Vexpress when no DTB is used (BZ#1082815)
  • qemu-1.6.2-4.fc20+ is required to boot the 3.15 Kernel (BZ#1091548)
  • A15 emulation through QEMU provides no output on console
  • Wandboard does not include console speed and needs to be edited during the boot. "setenv console ttymxc0,115200" (BZ#1044778)
  • After new kernel installation the 'fdtdir' in '/boot/extlinux/extlinux.conf' needs to be manually updated.
  • The 3.16 kernel included in the Alpha will not currently boot on Calxeda Highbank. (BZ#1139762)

For a list of all common bugs please visit - .


QUESTION : How do I use Fedora ARM when I have no serial cable or display.

ANSWER: Though not recommended it is possible to use Fedora ARM without a serial cable or display. When doing so you may want to limit updates to reduce the possibility of not being able to boot. (This example is from a Fedora 19 system, you may need to adjust the mounts used).

USER= # your user account
rm /run/media/$USER/__/etc/systemd/system/
rm /run/media/$USER/__/etc/systemd/system/
mkdir /run/media/$USER/__/root/.ssh/
cat /home/$USER/.ssh/ >> /run/media/$USER/__/root/.ssh/authorized_keys
chmod -R u=rwX,o=,g= /run/media/$USER/__/root/.ssh/

Give the system a few minutes to boot, when it obtains an IP you should be able to ssh to the root account.