amd64/140715: Dell M600 Blade fails to boot 7.2+ 64 bit

[Cliff Spradlin]

>Number:         140715
>Category:       amd64
>Synopsis:       Dell M600 Blade fails to boot 7.2+ 64 bit
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 20 08:10:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Cliff Spradlin
>Release:        7.2, 8.0 RC3
>Organization:
>Environment:
fails to boot -- Dell M600 Blade
>Description:
When the kernel is loading, it hangs with the last message showing:

atrtc0: <AT realtime clock> port 0x70-0x7f irq 8 on acpi0

See screenshot at http://twitpic.com/q7gqj.

Seems to have started in 7, still present in 8.0 RC3.  i386 works, it's just amd64 that fails.
>How-To-Repeat:
Boot up the installer for M600
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: