I can confirm exactly the same behaviour for an an dual 550 MHz/2M Xeon
system booting an netbsd-4 RC2 ACPI enabled kernel. 
In addition to that, I am not able to boot completeley because
the Intel network card (fxp) won't get operational and dhclient and
stuff fails. '* at acpi0 not configured' messages as quoted before here
too. The system works perfectly thou when booted with an MPBIOS enabled
kernel.

Sincerely,
    Adrian

On Wed, Oct 10, 2007 at 03:18:32PM -0500, Peter Eisch wrote:
> 
> My build system has become more and more useless under the fresher releases
> of netbsd-4.  It won't boot at all, hanging at various places, unless I
> 'boot -s' and then 'exit' once in single-user.  Most interesting is the
> reporting of the CPU speeds.  This system has three 900MHz/100MHz/2M xeons
> but note how they're reported.  The kernel is a GENERIC.MP with a few other
> additives, nothing major.  Then jump down to the end and note that two of
> the CPUs aren't even started.
>