BIOS Initialization ESB2 BMC Core TPS
Revision 1.0
Intel order number E18291-001
140
Command Request / Response Data Description
Set Memory RAS
Redundancy State
Request:
Byte 1 — RAS Domain Selector
[7:4]: Domain Type
0000b = Sparing
0001b = Mirroring
0010b:1111b = Reserved
[3:0]: Domain Instance (1-based)
Byte 2 — RAS Domain State
[7:2]: Reserved
[1:0]: Specific State
00b = Redundant
01b = Non-redundant, sufficient resources
10b = Non-redundant, insufficient resources
11b = Reserved
Response:
Byte 1 — Completion code
This command is used by BIOS to inform
the BMC of Memory RAS redundancy
state.
Domain Instance is:
Bit 0 for Branch 0
Bit 1 for Branch 1
Bit 0 for mirroring enabled between
Branch 0 and Branch 1 – this is the
only possible configuration for
mirroring.
RAS Domain State definition is:
Redundant = Domain is redundant
and working properly.
Non-redundant, sufficient resources
= Domain has a failure, but is still
operational. For example, a
FBDIMM has failed and the spare
FBDIMMs are being used.
Non-redundant, insufficient
resources = Domain has a failure
and is now unable to operate. For
example, a sparing domain in non-
redundant mode with sufficient
resources. A spare FBDIMM fails,
causing the system to be
inoperable.
Set Memory RAS
Configuration
Request:
Byte 1 – Sparing domain enable mask
[7:0] – Bit set indicates associated domain
enabled
Byte 2 – Mirroring domain enable mask
[7:0] – Bit set indicates associated domain
enabled
Response:
Byte 1 – Completion code
This command is used by the BIOS to
inform the BMC of the Memory RAS
redundancy state.
Each domain has an associated BMC
entity presence sensor whose state is
controlled by its associated mask bit
state.
Sparing Domain Enable Mask is:
[0] = Memory Branch 0 has DIMMs
marked for sparing
[1] = Memory Branch 1 has DIMMs
marked for sparing
Mirroring Domain Enable Mask is:
[0] = Memory Branches 0 and 1 are
mirrored (only possible configuration
on the chipset MCH).
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