amd64/94989: BTX Halts on Sun Fire X2100 w/6.1-BETA4 (amd64) and 5.4-RELEASE (x86)

[Chris Jones]

>Number:         94989
>Category:       amd64
>Synopsis:       BTX Halts on Sun Fire X2100 w/6.1-BETA4 (amd64) and 5.4-RELEASE (x86)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 27 01:10:11 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Chris Jones
>Release:        6.1-BETA4
>Organization:
Novus Ordo Systems
>Environment:
Sun Fire X2100 (AMD Opteron 146, 1 GB ECC RAM, 2x250 GB SATA HDDs, USB CD drive).  Unable to run uname as system won't boot.
>Description:
I'm trying to boot with a 6.1-BETA4 (amd64) CD and getting a BTX halted error, as follows:

> BTX loader 1.00  BTX version is 1.01
> Consoles: internal video/keyboard
>  
> int=0000000d  err=00000000  efl=00030206  eip=000027f5
> eax=00008001  ebx=00000000  ecx=a3800001  edx=000009ff
> esi=00000b18  edi=00000000  ebp=00000000  esp=000003da
> cs=f000  ds=46ca  es=46ac    fs=0000  gs=0000  ss=97ba
> cs:eip=2e 0f 01 16 c8 2a 0f 20-c0 0c 01 0f 22 c0 b8 30
>        00 8e c0 0f 20 c0 24 fe-0f 22 c0 eb 00 66 58 c3
> ss:esp=01 80 00 00 de 26 00 00-00 00 18 0b 00 00 00 00
>        00 00 00 04 00 00 00 00-00 00 9f 00 00 00 01 00
> BTX halted

Trying with a 5.4-RELEASE (x86) CD, I also get a BTX halted error:

> BTX loader 1.00  BTX version is 1.01
> Console: internal video/keyboard
> 
> int=0000000d  err=00000000  efl=00030206  eip=000027f5
> eax=00008001  ebx=00000000  ecx=a3800001  edx=0000009f
> esi=00000b18  edi=00000000  ebp=00000000  esp=000003d2
> cs=f000  ds=3eca  es=3eac    fs=0000  gs=0000  ss=97be
> cs:eip=2e 0f 01 16 c8 2a 0f 20-c0 0c 01 0f 22 c0 8b 30
>        00 8e c0 0f 20 c0 24 fe-0f 22 c0 eb 00 66 58 c3
> ss:esp=01 80 00 00 de 26 00 00-00 00 18 0b 00 00 00 00
>        00 00 f8 03 00 00 00 00-00 00 9f 00 00 00 01 00
> BTX halted

I've tried disabling everything I could in the BIOS having to do with IDE and DMA (having seen hints via Google that this was related to BTX halt problems), to no avail.
>How-To-Repeat:
Booting system with 6.1-BETA4 (amd64) or 5.4-RELEASE (x86) CDs reliably reproduces this problem.  Have not tried with other versions or OSes (have OpenBSD & Scientific Linux easily available and can try if that'd be helpful).
>Fix:

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