82845MP Datasheet, PDF (68/157 Pages) Intel Corporation – Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)

Intel^®82845MP/82845MZ Chipset-Mobile (MCH-M)
R
3.7.22.
Extended System BIOS Area (E0000h-EFFFFh)
This 64-Kbytes area is divided into four 16-Kbytes segments which can be assigned with different
attributes via PAM control register as defined by the table above.
System BIOS Area (F0000h-FFFFFh)
This area is a single 64-Kbytes segment, which can be assigned with different attributes via PAM control
register as defined by the table above.
FDHC – Fixed DRAM Hole Control Register – Device #0
Address Offset:
Default Value:
Access:
Size:
97h
00h
Read/Write, Read Only
8 bits
This 8-bit register controls a fixed DRAM hole: 15 MB-16 MB.
Bit
Description
7
Hole Enable (HEN). This field enables a memory hole in DRAM space. Host cycles matching an
enabled hole are passed on to ICH3-M through the hub interface. The hub interface cycles matching
an enabled hole will be ignored by the MCH-M. Note that a selected hole is not re-mapped.
0
Disabled. No hole
1
15 M-16 M (1 MB Hole)
6:0
Reserved
68
Datasheet
250687-002