7.3-STABLE acpi and mpt problems?

[John Baldwin]

On Wednesday 16 June 2010 7:14:09 am Lystopad Olexandr wrote:
> 
> Hi!
> 
> I have FreeBSD 7.3-STABLE on Biostar 945GC-M4 motherboard.
> When I boot with custom kernel it fail to boot on ACPI. FreeBSD box
> do not respond to any key. But it successfully boots with button 2
> from boot menu (without acpi).
> 
> Then I try to boot with GENERIC. Success! Ok, I try comment
> out one-by-one devices in GENERIC, rebuild and install kernel,
> and try to boot. My custom kernel boot fine until I comment
> out mpt device in kernel, but it successfully boots without
> acpi (button 2 on boot menu). I have no mpt devices in
> this box. When I insert "device mpt" back to the kernel it boots
> successfully.
> 
> Why acpi depends on device mpt? Why this server do not boot without
> this device?

How does it fail to boot in the non-mpt case?  Does it hang, does it panic?  
If it hangs, can you break into DDB and capture the output of 'ps' and a stack 
trace?  (A serial console is probably useful for this.)
 
-- 
John Baldwin