From: jgd@cix.co.uk   
      
   In article <10ckbq2$7dr$4@reader2.panix.com>,   
   cross@spitfire.i.gajendra.net (Dan Cross) wrote:   
      
   > Well, then I suppose they'll either split their product line or   
   > introduce a 32-bit M profile for V9.   
      
   They are effectively in the process of splitting the product line. The   
   current instruction sets with a future are T32 and A64. A32 is on the way   
   out.   
      
   > I'm do not entirely agree with that assessment re: 64-bit in   
   > MCUs, however: a lot of work is going into cryptographically   
   > signed secure boot stacks and hardware attestation for firmware;   
   > 64-bit registers can make implementing cryptography primitives   
   > with large key sizes much easier.   
      
   Fair point. The question would then be if it's worth creating a T64 or   
   just a simplified A64. It seems likely ARM is discussing that internally   
   or maybe even with some customers under NDA.   
      
   John   
      
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