Hi Christian!
Tumbleweed DVD install with my R7 250X and using Kernel 4.6. Got the DVD to boot and start GUI installation!!

Took a little tweaking. Will not boot up after install fro HD - Kernel panic "No working init found". Here's how I got the DVD Installation to work: Power up X1000 and insert DVD and press F
CFE>ramdisk -addr=0x24000000 -fs=iso atapi0.1:boot/ppc64/initrd [Enter] You get the fails to read error but it loads. Press "Up" arrow to re-display line and [Enter] no error
Loading.........53646964 bytes read
Entry at 0x0000000024000000
command status =0
CFE>setenv bootargs "root=/dev/ramdisk file=/cdrom/boot=boot [Enter]
command status = 0
CFE>boot -elf -noints -fatfs cf0:vmlinux-4.6 (final)
Verbose loading commences!!!! All discovered (including Realtek)
Network list: Shows several PWRficient Gigabyte. Choose the one with you MAC number EDIT. choose DHCP 4 and 6 NEXT
I checked Add on Repositories for test.
Initializing...
Suggested Partitioning and shows all manner of things for sdb and lists sdc5 as SWAP (created by 12.04) weird! I hit next to test default partition option. You can choose Expert. NEXT
Time Zone - don't have to explain NEXT
Warning pops up "unable to download list of repos or no repos defined. I hit OK then NEXT (for testing)
Choose Desktop (awesome) still getting somewhere in the GUI installation
I chose Gnome for testing but love KDE
Create Local User - New User - I checked the box Use this password for ADMIN and unchecked Auto Login
I had to NEXT through bug errors. Then it was time to restart.
CFE> setenv bootargs "root=/dev/sdb1 quiet ro splash"
CFE> boot -elf -noints -fatfs cf0:vmlinux-4.6
Loading is normal then stops at "No working init found"
"Rebooting in 180 secs
This occurs with Kernal 4.7 alpha2 as well.
Good news is I got this far and so close. I was able to boot from DVD and use Graphical Installation Environment. Now if you can repeat. This mystery init not found file may be resolved for a smoother install process. Maybe address the Partitioning part of the Installation as well. May have to modify that. I have a snap shot of the default partitions created by OpenSuse.
Cheers!!
John