After installing Opensuse Tumbleweed, the boot process stops with the message:
sp5100_tco: I/O adress 0x0cd6 already in use
This bug is present since months when I install Opensuse Tumbleweed!
When I choose “Recovery Mode” (sorry i see it only in german) the system (Opensuse Tumbleweed 4.7.5-1-default) boots up and everything works fine!
When the module sp5100_tco is blacklisted via /etc/modprobe.d/50-blacklist.conf
I get no error but system still halts at boot when booting per default grub2 entry!
There is no message or indication to see why booting stops at this point…
Opensuse Leap 42.1 works fine.
Fedora 24 with the same Kernel (4.7.5-1) shows the error message, but continues booting…
Opensuse Tumbleweed installation media as the Live CD media boots just fine.
After changing several kernel options which removed the error messages but didn’t allow the system to boot properly I went back to look at the last changes I made to the system. I had added a nofail option to an entry in fstab while I was swapping disks. It appears that when the kernel attempts to mount a disk with a nofail option it starts a time-limited process. It seems that this process triggered the problem and prevented the system from booting further than the diagnostic stage. I also tried booting a Knoppix live system from a USB key and that failed to boot even though it wasn’t looking at fstab so that’s looking like a separate problem.