NetBSD 8.0-BETA hangs at boot at xHCI (so does netbsd-7)

Hi!

I currently run netbsd-7-1 amd64 on a m4a88td-m evo board with an Amd Phenom processor, which boots fine.

I decided to try the netbsd-7 branch, which didn't boot, then I decided to try the netbsd-8 branch, since I'd like to run that when it comes out.

Both the netbsd-7 and the netbsd-8 branches behave in the same way.

They hang at:

uhub0 at usb0: vendor 1033 (0x1033) xHCI Root Hub (0000), class 9/0, rev 1.00/1.00, addr 0

uhub1 at usb1: vendor 1033 (0x1033) xHCI Root Hub (0000), class 9/0, rev 2.00/1.00, addr 0

I can't break to the debugger, since my keyboard and mouse is USB. I tried compiling a debug kernel, but it doesn't give any further information.

An observation that might not say a thing, it continued when I pressed the powerbutton, listing OHCI and EHCI, then syncing discs and then crashing to the debugger with (this from netbsd-8):

fatal protection fault in supervisor mode

trap type 4 code 0 rip 0xffffffff804659b0 cs 0x8 rflags 0x10282 cr2 0 ilevel 0 rsp 0xfffffe810e92acb0

curlwp 0xfffffe822deed4a0 pid 0.15 lowest kstack 0xfffffe810e9272c0

kernel: protection fault trap, code=0

stopped in pid 0.15 (system) at netbsd:usbd_fill_deviceinfo+0x220: movsbl1

0(%rsi),%edx

All information is transcribed by hand.

Anything else I can provide that would be helpful?