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Date:      Fri, 06 Oct 2006 09:26:45 -0800
From:      "Peter A. Giessel" <pgiessel@mac.com>
To:        Paul Lathrop <plathrop@squaretrade.com>
Cc:        freeBSD <freebsd-questions@freebsd.org>
Subject:   Re: PAE tuning
Message-ID:  <452691D5.4010904@mac.com>
In-Reply-To: <45268D83.6030100@squaretrade.com>
References:  <45254F1D.5000106@squaretrade.com> <CC3AFB13-8FD9-44AB-A4FB-01F898B491C0@mac.com> <45255976.10903@squaretrade.com> <9AEC0B71-516A-444F-B9A3-927CC37EBF07@mac.com> <45268D83.6030100@squaretrade.com>

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On 2006/10/06 9:08, Paul Lathrop seems to have typed:
> Is there a 64 
> bit Intel distro I'm missing? I saw someone suggesting I use the AMD64 
> version, but when I attempt to boot that from the install disk I get 
> some debugging output and a message saying "BTX halted" - I suspect that 
> means I can't follow that suggestion...

Theoretically, amd64 should work on a Xeon (depending on which Xeon
you are using, more system details would be required to say for sure)
See:

http://www.freebsd.org/releases/6.1R/hardware-amd64.html

*** QUOTE ***
Since mid-2003 FreeBSD/amd64 has supported the AMD64 (“Hammer”) and
Intel EM64T architecture, and is now one of the Tier-1 platforms
(fully supported architecture), which are expected to be Production
Quality with respects to all aspects of the FreeBSD operating system,
including installation and development environments.

Note that there are two names for this architecture, AMD64 (AMD) and
Intel EM64T (Extended Memory 64-bit Technology). 64-bit mode of the
two architectures are almost compatible with each other, and
FreeBSD/amd64 should support them both.

As of this writing, the following processors are supported:

    * AMD Athlon64 (“Clawhammer”).
    * AMD Opteron (“Sledgehammer”).
    * Intel 64-bit Xeon (“Nacona”). This processor is fabricated on 90nm process technology, and operates with 2.80 to 3.60 GHz (FSB 800MHz) and Intel E7520/E7525/E7320 chipsets.
    * Intel Pentium 4 Processor supporting Intel EM64T (“Prescott”).
This is fabricated on 90nm process technology, uses FC-LGA775
package, and operates with 3.20F/3.40F/3.60F GHz and Intel 925X
Express chipsets. The corresponding S-Spec numbers are SL7L9, SL7L8,
SL7LA, SL7NZ, SL7PZ, and SL7PX. Note that processors marked as 5xx
numbers do not support EM64T.

Intel EM64T is an extended version of IA-32 (x86) and different from
Intel IA-64 (Itanium) architecture, which FreeBSD/ia64 supports. Some
Intel's old documentation refers to Intel EM64T as “64-bit extension
technology” or “IA-32e”.
*** END QUOTE ***

There is a lot of information about the "BTX halted" error message in
the archives if you believe your system should be supported:
http://www.freebsd.org/cgi/search.cgi?words=%22BTX+halted%22&max=25&sort=score&index=recent&source=freebsd-questions



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