[U-Boot-Users] MCR question

Laudney Ren bren at sjtu.edu.cn
Sat Jan 18 09:34:33 CET 2003

Hi, all:

 From MPC860 User Manual, MCR has a field named "OP". when its value is 
10, the operation is "RUN". The description for "RUN" in the manual is:

"... the AMX bits of the UPM RAM word in this software initiatede 
pattern must all be set to 0b11. Thus, the address for this pattern is 
the value written to MAR. The data bus is not driven."

My question is, what does the "pattern" mean? What's its use? What is 
the "address for the pattern"? Is this address a RAM address and the 
pattern will be read from this location? What is MAR for?


Laudney Ren

An expert is one who knows more and more about less and less
until he knows absolutely everything about nothing.

More information about the U-Boot mailing list