I tried my brand new HP Compaq laptop 6710b under DragonFly, but during booting
the installer CD it "throws" a page fault:

  uhub0: 2 ports ...
  uhub0: <Intel UHCI root hub, ...>

  Fatal trap 12: page fault while in kernel mode
  fault virtual address = 0x0
  fault code            = supervisor write, page not present
  instruction pointer   = 0x8:0xc04a9c5c
  stack pointer         = 0x10:0xc25f8d38
  frame pointer         = 0x10:0xc25f8d48
  code segment          = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gram 1
  processor eflags      = interrupt enabled, resume, IOPL = 0
  current process       = Idle
  current thread        = pri 46 (CRIT)

  kernel: type 12, code=2
  stopped at       usb_add_task+0x4c:    movl     %edi,0(%eax)


This happens with the latest snapshot version as of yesterday and also with the
1.10 release.

FreeBSD 7.0-BETA3 silently hangs during boot, while NetBSD 4.0RC_4 works like a
charm (it can even dual-boot windows natively)! 

There exists a thread on dragonfly.kernel named "Kernel panic during boot in
usb_add_task" about this issue.