[SunRescue] Help booting 64bit kernel on an Ultra

[Bill Bradford]

On Tue, Sep 07, 1999 at 12:44:29AM -0400, j. grubman wrote:
> # ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU
> # On systems containing 200MHz or lower UltraSPARC-I processors,
> # it is possible for a user to run a 64-bit program designed to exploit a
> # problem that could cause the processor to stall.  Since 64-bit programs
> # cannot run on the 32-bit kernel, the 32-bit kernel is chosen as the
> # default boot file on these systems.
> # The code sequence that exploits the problem is very unusual and is not
> # likely to be generated by a compiler.  Assembler code had to be
> # specifically written to demonstrate the problem. It is highly unlikely
> #that a legitimate handwritten assembler routine would use this code sequence.
> # Users willing to assume the risk that a user might accidentally or
> # deliberately run a program designed to cause a processor to stall
> # may choose to run the 64-bit kernel by uncommenting the following item:
> #ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU=true

Doh.  I didnt read far enough down in the manpage.  Thats what I get 
for being impatient. 8-)

Anybody else noticed that an Ultra 1/140 puts off a LOT of heat?  I mean,
I could keep my coffee warm next to the CPU... considering I've only
got a 4.5gig HD and two 64mb DIMMs in here, along with a CG6, I'm really
surprised at how much hot air it puts out (more than a ss10 with dual
150mhz HyperSPARCs and a ZX..)

Bill

-- 
Bill Bradford * mrbill at sunhelp.org * http://www.sunhelp.org
------------------------------------------------------------
>From a Sun Microsystems bug report (#4102680):
"Workaround: don't pound on the mouse like a wild monkey."