Dell Poweredge 1950, boot problem

[Sergey Lyubka]

Hi, when booting FreBSD 6.2 on Dell Poweredge, I see the following:

1. It boots OK only in 'safe mode' . acpi is disabled, and only 1 cpu
is detected.
2. If boot normally (with ACPI), boot almost always hangs just before
detecting the
harddrive (SAS). If it boots, 8 CPUs are detected, while only 2 are
under the cover.

Has anybody any idea on how to boot it properly?