i386/126550: BTX hang on AMD 780G/SB700 chipset with sata ahci

[Gobble]

>Number:         126550
>Category:       i386
>Synopsis:       BTX hang on AMD 780G/SB700 chipset with sata ahci
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug 15 09:20:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Gobble
>Release:        7.0
>Organization:
PRIVATE
>Environment:
Can't boot 
>Description:
Install freebsd and reboot. Get BTX halt error.

Install was done with standard MBR selected as option as I already have Ubuntu Grub boot manager.
>How-To-Repeat:
Install and reboot.
>Fix:


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