Re: [ts-7000] Re: Newbie question before buying TS-7xxx

["Breton M. Saunders" <>]

On 08/03/2010 02:18 PM, Charles wrote:

--- In m("yahoogroups.com","ts-7000");">, "Breton M. Saunders" 
  

Is this buggy FPU only in the 200MHz versions of the ARM9-based TS-boards, or does it also affect the 250MHz and 500MHz?

   
      

The problems we're speaking about here only affect the Cirrus ep93xx 
based boards.  The ep93xx chip is perfectly stable with the FPU turned 
off.  We built the alert me hub around an ep9302 - the ts7400 served as 
the development platform for it.  The chip is rock solid, provided that 
one provides a proper reset fix (TS does this in their CPLD).

As long as your application can be designed to work with fixed point 
(integer) arithmetic, then the TS ep9302 based boards are excellent, and 
a well tested solution.

    

Can I disable FPU usage all together in the kernel and/or clib so I'm certain the FPU won't be used?
   
      

Yes.  Default kernel configuration is this way.  (I have never deployed 
a FP kernel on this chip.  I have built one or two for testing though.)
    

I was initially interested in the TS-7260 but perhaps it's worth choosing TS-7550 instead.  Unfortunately it doesn't have any ADCs...
   
      

The Cavium chip is faster than the ep9302; I think its just a better 
tuned Arm 9 and memory subsystem.  The Atmel one looks like the fastest 
    

Careful here if you need FP.  I understand EABI is impossible with the Cavium chip, so FP performance would be better with EABI ep93xx than OABI Cavium.  (I think ... I don't have a TS-7550 to test, but it's something to be aware of).

  

Humm.  What a shame.  No thumb support.

This thread has more details - looks like a linker fix can make things work: m("lists.armedslack.org/msg00216.html","//www.mail-archive.com/armedslack");">http: .  But probably not for the feint of heart.

    -Brett

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