
Intel® SRMK2 Internet Server Technical Product Specification
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204h
MTRRphysBase2
Physical Address Base 2
0000h
205h
MTRRphysMask2
Physical Address Mask 2
0000h
206h
MTRRphysBase3
Physical Address Base 3
0000h
207h
MTRRphysMask3
Physical Address Mask 3
0000h
208h
MTRRphysBase4
Physical Address Base 4
0000h
209h
MTRRphysMask4
Physical Address Mask 4
0000h
20Ah
MTRRphysBase5
Physical Address Base 5
0000h
20Bh
MTRRphysMask5
Physical Address Mask 5
0000h
20Ch
MTRRphysBase6
Physical Address Base 6
0000h
20Dh
MTRRphysMask6
Physical Address Mask 6
0000h
20Eh
MTRRphysBase7
Physical Address Base 7
0000h
20Fh
MTRRphysMask7
Physical Address Mask 7
0000h
250h
MTRRfix64k_00000
Fixed range for 00h - 7Fh segment in 64KB block
0606060606060606h
258h
MTRRfix16k_80000
Fixed range for 80h - 9Fh segment in 16KB block
0606060606060606h
259h
MTRRfix16k_A0000
Fixed range for A0h - BFh segment in 16KB block
0000h
268h
MTRRfix4k_C0000
Fixed range for C0h segment in 4KB block
0000h
269h
MTRRfix4k_C8000
Fixed range for C8h segment in 4KB block
0000h
26Ah
MTRRfix4k_D0000
Fixed range for D0h segment in 4KB block
0000h
26Bh
MTRRfix4k_D8000
Fixed range for D8h segment in 4KB block
0000h
26Ch
MTRRfix4k_E0000
Fixed range for E0h segment in 4KB block
0000h
26Dh
MTRRfix4k_E8000
Fixed range for E8h segment in 4KB block
0000h
26Eh
MTRRfix4k_F0000
Fixed range for F0h segment in 4KB block
0505050505050505h
26Fh
MTRRfix4k_F8000
Fixed range for F8h segment in 4KB block
0505050505050505h
2FFh
MTRRdefType
Default memory type and global enable flags
00C00h
7.3.2.2
Cache State on Boot
The BIOS looks at a bit in CMOS to determine if the system cache should be enabled or disabled.
If the cache is enabled, the cache controller in the processor is initialized in a consistent manner
consistent with the chipset.
7.3.2.3
Option ROM Shadowing
All on-board adapter ROMs (stored in compressed form in the system Flash ROM), and PCI
adapter ROMs are shadowed into RAM in the ISA-compatible ROM adapter memory space
between C0000h to DFFFFh. PCI BIOS ROMs are always shadowed. Typically, the video
BIOS is shadowed at C0000h if a video controller is present.
7.3.2.4
Memory Speed Optimization
The BIOS detects the system memory speed and bus speed and optimizes the memory controller
for the best performance. The system bus speed can be determined by using the processor
internal speed and the bus ratio. The memory DIMM speed can be determined using its ID.
Using this information the BIOS can set up the memory controller register for the best
performance.