Specifications

BIOS Initialization QSSC-S4R Technical Product Specification
174
Byte N a m e D e s c r i p t i on
3 Record Subtype Value 0Bh
Thermal
Profile Data
Record
4 Flags [7:2] – Reserved
[1:0] – Memory throttling mode that this record is valid for
0 = None supported
1 = Open-loop throughput throttling (OLTT)
2 = Close-loop thermal throttling (CLTT)
3 = reserved
5 Profile Support Bitmap [7:0] Fan Control Profile Support. This is a bitmask that indicates
w
hich fan control profiles that this record is valid for. 0 means no profile is
defined.
Bit 7 – 1 = valid for profile 7
Bit 6 – 1 = valid for profile 6
Bit 5 – 1 = valid for profile 5
Bit 4 – 1 = valid for profile 4
Bit 3 – 1 = valid for profile 3
Bit 2 – 1 = valid for profile 2
Bit 1 – 1 = valid for profile 1
Bit 0 – 1 = valid for profile 0
6:N Thermal Profile Data Byte format defined by thermals team and / or the BIOS. May be formalized
later. If the number of bytes in this field changes, the “Record Length” field and
“_REC_LEN” tag above the SDR data must be adjusted to match.
The maximum supported value of N is 63, for a maximum SDR body size of 64
bytes, with 58 bytes of actual thermal profile data. This constraint is imposed by
the IPMI 2.0 specification. Note that a maximum-sized SDR can be retrieved
over the KCS-SMS interface, but it may be truncated over other interfaces.
The details of bits [6:N] are defined in the QSSC-S4R Fan Speed Control and Thermal Management Platform
Architecture Specification, rev 1.0. and as described below
Table 107. Memory Thermal Throttling OEM SDR bytes 6:N details
Thermal
Profile
Data
Recordt
a
Byte Bit Name Description
6 TempInlet Temperature at chassis inlet in units of 0.5 degrees C (i. e.
90 units = 45 C) applied to SYS.TempInlet
7 TempRise Temperature rise from chassis inlet to dimm local ambient
in units of 0.5 degrees C (i. e. 90 units = 45 C) applied to
SYS.TempRise
8:9 airFlow
A
verage air flow velocity in dim channel in units of mm/sec
(i.e. 1500 units = 1.5 m/s) applied to SYS.AirFlow
10:11 dimmPitch The pitch between DIMMs in units of 1/1000 inch (ie. 410
units = 0.41 in) applied SYS.DimmPitch
12 0:1 Throttle Mode 00 - Disabled
01 – VTS Only (OLTT)
10 – Software Mode (EPSD not planning to use)
11 – EXTTS CLTT
12 2:7 Reserved
13 0 Therm_Reg_Lock Prevents further modification of all parameters in this table.
This should not be set if parameters are to be modified
during operation. “0” for all EPSD product
13 1:2 Hyst (Hysteresis) Configured by BIOS MRC to TSOD
00 - disable hysteresis (default)
01 - 1.5C
10 - 3C
11 - 6C
13 3 Control event# mode Configured by BIOS MRC at boot
(EPSD products use Tcrit mode)
Control event# mode
0 – (default) event# asserted if above Thigh or below Tlow in
addition to above Tcrit
1 – event# asserted only if above Tcrit