we could also explore a possibly alternative approach to hook up spike 
directly(not via openOCD),  which might enable us to get around the problem of 
data copy speed(via directly memory copy shortcuts into the simulator). 

openOCD is only one way to implement 
https://github.com/apache/incubator-tvm/blob/master/src/runtime/micro/low_level_device.h
  and the JTag interface of spike could indeed be slow because the memory need 
to be set via a bit by bit basis

I talked to some spike dev before and who said it is possible, but i haven't 
look into how to hack that.





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