Intel® Server Boards SE7320SP2 and SE7525GP2
Functional Architecture
Revision 4.0
49
3.7.1.4
System Management Mode Handling
The chipset supports System Management Mode (SMM) operation in one of three modes.
System Management RAM (SMRAM) provides code and data storage space for the SMI_L
handler code, and is made visible to the processor only on entry to SMM, or other conditions
which can be configured using the Intel chipset.
The MCH supports three SMM options:
Compatible SMRAM (C_SMRAM)
High segment (HSEG)
Top of memory segment (TSEG)
Three abbreviations are used later in the table that describes SMM Space Transaction
Handling.
SMM Space Enabled
Transaction Address Space (Adr)
DRAM Space (DRAM)
Compatible (C)
A0000h to BFFFFh
A0000h to BFFFFh
High (H)
0FEDA0000h TO 0FEDBFFFFh
A0000h to BFFFFh
TSEG (T)
(TOLM-TSEG_SZ) to TOLM
(TOLM-TSEG_SZ) to TOLM
Notes: High SMM is different than in previous chipsets. In previous chipsets the high segment
was the 384 KB region from A_0000h to F_FFFFh. However C_0000h to F_FFFFh was not
useful so it is deleted in MCH.
TSEG SMM is different than in previous chipset. In previous chipsets the TSEG address space
was offset by 256 MB to allow for simpler decoding and the TSEG was remapped to directly
under the TOLM. In the MCH the TSEG region is not offset by 256 MB and it is not remapped.
Table 17. SMM Space Table
Global Enable
G_SMRAME
High Enable
H_SMRAME
TSEG Enable
TSEG_EN
Compatible
(C) Range
High (H)
Range
TSEG (T)
Range
0 X
X Disable
Disable
Disable
1 0 0 Enable
Disable
Disable
1 0 1 Enable
Disable
Enable
1 1 0 Disable
Enable
Disable
1 1 1 Disable
Enable
Enable
Summary of Contents for SE7320SP2 - 800MHZ Ecc Ddr Xeon
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