[U-Boot-Users] MCR question

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?

Thanks.

Laudney Ren