failure to mount cd when installing 64-bit

[Pierre Abbat <phma@xxxxxxxxxxxxx>]

I burned a CD of the latest 64-bit DragonFly and booted a 64-bit laptop with 
it. It started CPUs 0 through 7 and then issued the following messages:

WARNING: waiting for the following device to finish configuring:
xpt:  func=ffffffff8027dd67 arg=0
tryroot cd8
no disk named 'cd8'
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6
Mounting root from cd9660:cd9
tryroot cd9
no disk named 'cd9'
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6
Mounting root from cd9660:/dev/cd0
tryroot cd0
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6

Manual root filesystem specification:
[skip]
mountroot>?
Possibly valid devices for root fs:
"md0" "md0s0" "mapper/control"

How do I make it work? It's an HP Pavilion with Intel i7 CPU.

Pierre
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