This weekend I've had the opportunity to test openSUSE on a prototype of CZ.NIC's Indiegogo-funded Turris Omnia router .
In a FOSDEM 2016 talk a prototype had already been shown to the public, whereas this was the first time we could peek at the current software environment of a running prototype ourselves and provide some early third-party distro feedback to its creators.
Known for being overly critical and aiming at perfect solutions, let me say in advance that the Armada 385 mainline kernel support looks quite good already, needing only the Turris Omnia Device Tree  apparently. Turris Omnia's U-Boot  is quite usable but will need a little more love before we can benefit from new features such as UEFI boot support (both upstream where it's not yet using the distro defaults  and downstream for deriving a clean new turris_omnia_defconfig). I'm confident that most of the functional limitations I observed can be fixed until the final board version ships to backers.
That said, here's a quick how-to I would've added to the Wiki  if it let me...
== Manual installation ==
As of 2016-03-18, the prototype's U-Boot does not yet support XHCI, so that the two USB ports cannot be used for booting. That leaves eMMC and mSATA as local boot options.
=== Building an upstream kernel ===
Use mvebu_v7_defconfig and enable CONFIG_BTRFS_FS.
=== Installation to USB ===
As of 2016-03-18, the prototype's U-Boot does not yet support XHCI and therefore does not recognize any USB devices on either of the two USB ports. Still you can place your rootfs onto USB.
As of 2016-03-18, the prototype's kernel has USB drivers built as modules and no initrd, so you cannot directly boot a USB rootfs with it. An easy solution is to build an upstream kernel yourself with those drivers built-in and to copy it to the eMMC's /boot directory (e.g., zImage-next).
Note: In linux-next.git next-20160318 kernel only USB 3.0 devices work.
Partition your USB disk with GPT or MBR. Create a partition for the rootfs and extract an [http://download.opensuse.org/ports/armv7hl/tumbleweed/images/openSUSE-Tumble... openSUSE-Tumbleweed-JeOS.armv7-rootfs.armv7l-Current.tbz] tarball. Then boot similar to this (derived from bootargs and mmcboot variables):
setenv bootargs 'console=ttyS0,115200 root=/dev/sda1 rootfstype=ext4 rootwait rw' btrload mmc 0 0x01000000 boot/zImage-next @ btrload mmc 0 0x02000000 boot/dtb @ bootz 0x01000000 - 0x02000000
Note: As always, "/dev/sda1" is unsafe as it may become, e.g., /dev/sdb1 when an mSATA SSD or a second USB storage device is connected.
You could save those commands in a U-Boot environment variable, otherwise you will need to re-type them on each boot.
=== Installation to mSATA ===
Unless you have another device with mSATA port, you may find it difficult to set up the SSD.
As of 2016-03-18, the prototype's OpenWrt kernel did not recognize a Samsung SSD 850 EVO 120 GB mSATA card (while U-Boot's scsi scan does). As workaround you can compile an upstream kernel (cf. [[#Building_an_upstrea_kernel|above]]), copy it under a new name to /boot on the eMMC (e.g., zImage-next) and boot OpenWrt with this new kernel (derived from mmcboot variable):
btrload mmc 0 0x01000000 boot/zImage-next @ btrload mmc 0 0x02000000 boot/dtb @ bootz 0x01000000 - 0x02000000
Now that you have a /dev/sda device for the mSATA SSD, you may find that OpenWrt does not come with parted, fdisk or gdisk tools for partitioning this device.
One solution is to boot into openSUSE Tumbleweed, where you can easily install those tools, from USB (cf. [[#Installation_to_USB|above]]):
setenv bootargs 'console=ttyS0,115200 root=/dev/sdb1 rootfstype=ext4 rootwait rw' btrload mmc 0 0x01000000 boot/zImage-next @ btrload mmc 0 0x02000000 boot/dtb @ bootz 0x01000000 - 0x02000000
From inside openSUSE verify that /dev/sda is your mSATA card and
partition it using gdisk (zypper in gptfdisk). Format your new partition and extract a JeOS rootfs tarball. For now just copy zImage-next and dtb over.
mount /dev/sda1 /mnt tar xvjf [http://download.opensuse.org/ports/armv7hl/tumbleweed/images/openSUSE-Tumble... openSUSE-Tumbleweed-JeOS.armv7-rootfs.armv7l-XXX.tbz] -C /mnt cp /boot/zImage-next /mnt/boot/zImage-next cp /boot/dtb /mnt/boot/armada-385-turris-omnia.dtb ln -sf zImage-next /mnt/boot/zImage ln -sf armada-385-turris-omnia.dtb /mnt/boot/dtb
Boot similar to this:
setenv bootargs 'console=ttyS0,115200 root=/dev/sda1 rootfstype=btrfs rootwait rw' setenv fdtfile armada-385-turris-omnia.dtb scsi scan btrload scsi 0:1 0x01000000 boot/zImage-next btrload scsi 0:1 0x02000000 boot/dtb/$fdtfile bootz 0x01000000 - 0x02000000
It's beginning to look much more like openSUSE, just lacking an openSUSE kernel still.
=== Installation to eMMC ===
In theory you can also replace OpenWrt with openSUSE, optionally backing it up as btrfs snapshot. To do so you'll need to boot from some other root device such as USB or mSATA.
mount /dev/mmcblk0p1 /mnt btrfs subvolume snapshot /mnt/@ /mnt/root-pre-opensuse rm -rf /mnt/@/* tar xvjf [http://download.opensuse.org/ports/armv7hl/tumbleweed/images/openSUSE-Tumble... openSUSE-Tumbleweed-JeOS.armv7-rootfs.armv7l-XXX.tbz] -C /mnt/@ cp /boot/zImage-next /mnt/@/boot/zImage-next cp /boot/dtb /mnt/@/boot/armada-385-turris-omnia.dtb ln -sf zImage-next /mnt/@/boot/zImage ln -sf armada-385-turris-omnia.dtb /mnt/@/boot/dtb
Then on next boot you should boot into openSUSE automatically.
=== openSUSE kernel ===
Unlike mvebu_v7_defconfig, the openSUSE kernels build drivers as modules whenever possible. To boot you will need additional driver modules in a ramdisk. There's two easy ways to create such an initrd file. Either use Kiwi (as done for our JeOS SD card images) or boot into the system once without modules and have the initrd be created by dracut. If you zypper up or zypper dup the system for the first time, chances are a new kernel-default package gets installed and generates an initrd; you can force this the easy way by reinstalling the package (zypper in -f kernel-default) or figure out the lengthy dracut command line. Try to boot it like this:
setenv bootargs 'console=ttyS0,115200 root=/dev/sda1 rootfstype=btrfs rootwait rw' scsi scan btrload scsi 0:1 0x01000000 boot/zImage btrload scsi 0:1 0x02000000 boot/dtb/armada-385-turris-omnia.dtb btrload scsi 0:1 0x03000000 boot/initrd bootz 0x01000000 0x03000000:$filesize 0x02000000
This resulted in:
Kernel image @ 0x1000000 [ 0x000000 - 0x6f2d78 ] Wrong Ramdisk Image Format Ramdisk image is corrupt or invalid
''To be investigated - U-Boot lacking CONFIG_SUPPORT_RAW_INITRD?'' This is blocking creation of a JeOS disk image.
 https://en.opensuse.org/HCL:Turris_Omnia  https://gitlab.labs.nic.cz/turris/openwrt/tree/test/target/linux/mvebu/files...  https://gitlab.labs.nic.cz/turris/turris-omnia-uboot/commits/omnia  http://git.denx.de/?p=u-boot.git%3Ba=blob%3Bf=include/configs/db-88f6820-gp....