I have what appears to be roughly the same situation as described by Robert 
Fisher (ASUS H110 board and a 6th gen i5). Booting with -v i end up with:

    root on /ramdisk:a fstype ufs

Neither F1+A nor Shift+Pause breaks out of this. Following suggestions from 
Robert's thread, I've attempted "-B disable-xhci=true" and "-B 
disable-acpi=true" but saw no difference. I have also disabled all C-states, 
power management, UEFI, power management and speedstep-type of things I could 
find but saw no difference. 

rmustacc said he hadn't seen reports of coffee lake at all, working or not.

ricco386 suggested looking through this seemingly related issue:
    https://github.com/joyent/smartos-live/issues/727

Though I didn't understand everything going on in that thread, and knowing that 
I am likely running a different version than what is depicted there, I did 
follow steps from this point:
    https://github.com/joyent/smartos-live/issues/727#issuecomment-342868065

Here is what I saw at the point of the hang, which definitely differs from what 
was shown in that thread:
    https://postimg.org/image/4g4kovbdx/


So ...

I've been running SmartOS on Supermicro hardware for several years at small 
customer sites, using a mix of native zones and KVM to achieve a more-or-less 
all-in-one server solution. I set them up and automate what management I can, 
and don't revisit until/unless there are problems. It basically just works - so 
I never end up getting very deep into troubleshooting. Because of this, I'm 
unfamiliar with kernel debugging and all that - so I don't have much to share 
relating to my problem other than what is listed above.

BUT the Gigabyte/i7 box is one I just built in hopes of playing around - so 
it's currently available to bang on in case someone cares to hold my hand 
through doing so. Perhaps this can be used to find/circumvent issues related to 
coffee lake. Any help would be appreciated.


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