i386/127391: Intel 6300ESB SATA150 cannot find disk and boot under 6.3

[Greg Satz]

>Number:         127391
>Category:       i386
>Synopsis:       Intel 6300ESB SATA150 cannot find disk and boot under 6.3
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep 14 21:30:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Greg Satz
>Release:        6.3
>Organization:
iranger.com
>Environment:
FreeBSD fnu.iranger.com 6.1-RELEASE-p19 FreeBSD 6.1-RELEASE-p19 #5: Fri Sep  7 23:59:42 MDT 2007     satz at fnu.iranger.com:/usr/src/sys/i386/compile/FNU  i386

>Description:
I am using 6.1 on a Dell PowerEdge 750 machine with an Intel 6300ESB SATA150 controller. 6.1 works fine. 6.3 fails to boot due to its not initializing ata1 where my sata disk is located as ad2. ata0 is initialized just fine which has the cdrom. Consequently 6.3 cannot find root nor boot. 
>How-To-Repeat:
Try to boot 6.3 on a Dell Poweredge 750.
>Fix:


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