Datasheet

Processor Uncore Configuration Registers
224 Datasheet, Volume 2
4.7.8 MC_CFG_LOCK
BIOS must write the MC_CFG_LOCK bit after configuration is complete to allow the
Integrated Memory Controller to start accepting requests.
3:2 RW 0
MAXNUMRANK. Maximum Number of Ranks
00 = Single Ranked
01 = Double Ranked
10 = Reserved
1:0 RW 0
MAXNUMDIMMS. Maximum Number of DIMMs
00 = 1 DIMM
01 = 2 DIMMs
10 = Reserved
11 = Reserved
Device: 3
Function: 0
Offset: 64h
Access as a DWord
Bit Attr Default Description
Device: 3
Function: 0
Offset: 68h
Access as a DWord
Bit Attr Default Description
31:2 RO 0 Reserved
1WO 0
MC_CFG_UNLOCK
This bit unlocks the Integrated Memory Controller configuration registers
without processor reset. This bit does NOT unlock any other lock type
without a processor reset.
0WO 0
MC_CFG_LOCK
This bit locks the Integrated Memory Controller configuration registers.
Writes are no longer allowed to the configuration registers.