FreeBSD hangs at boot

[Daniel A.]

Hi.
I am trying to get FreeBSD 6.0 running on my desktop machine, but with no luck.
When I boot in anything but Safe Mode, FreeBSD will hang at boot and
refuse to go further. I've tried to let have a go at it for 30
minutes, but the boot process didnt get any further.

When I try to boot the machine normally, it freezes at the following point:
[...]
ad0: 76319MB <Seagate ST380021A 3.19> at ata0-master PIO4
ad1: 76319MB <Seagate ST380021A 3.19> at ata0-slave PIO4
acd0: DVDR <PLEXTOR DVDR PX-740A/1.01> at ata1-master PIO4
ad8: 114473MB <Seagate ST3120022A 3.06> at ata4-master PIO4

The ad8 device is attached to my onboard "Promise PDC20376 SATA150
controller", but even if I disable that device in BIOS, the system
then freezes after displaying:
acd0: DVDR <PLEXTOR DVDR PX-740A/1.01> at ata1-master PIO4

Attached is the dmesg.boot I get when the SATA RAID controller is
enabled and I boot in safe mode.
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