Two_pass_count
 	1st pass  	write data=address for all addresses
 	2nd pass	read and compare all addresses

 Two pass is useful for detecting addressing errors.

 Random
 Random numbers are generated from a seed.
 	seed = 0	the same sequence of pseudo-random numbers 
 			each time
 	seed = time	different sequence each time

 One_pass
 For each address, performs a write followed by a read and compare.

 Block_transfer
 For the block of addresses, performs a write followed by a read and
 compare. 
 There is a maximum value of size of block depending on program
 version. 

 This is much quicker than the single transfer tests for the CFI.

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