Intel D525MWV and ehci driver
It seems there is a problem with 'ehci' driver on Intel Atom D525MWV platform.
I tried AI images of OpenSolaris b134 and OpenIndiana b148.
They both stuck on boot, machine is dead - even switching to the kernel debugger doesn't work.
After some investigation I noticed the issue is 'ehci' so disable-ehci=true is a working workaround.
I don't have an access to this platform at the moment so I can't provide more details.