Bitfields for AMD-640 DRAM Configuration Register 2:
Bit(s)	Description	)
 7-5	type of address mapping for memory banks 4 and 5 (see #00989)
 4-3	reserved (0)
 2-0	last populated memory bank
	000 - 101 = Bank0 - Bank5
	110,111 reserved
Note:	banks 2-4 are non-cacheable if tag RAM is ten bits + modified bit
SeeAlso: #00983,#00989