Intel S1200BT Technical Product Specification - Page 60

External Communications Link, 4.3.2, BIOS-Integreated BMC-ME Communication

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Platform Management Intel® Server Board S1200BT TPS 4.4.3.1 External Communications Link The Integrated BMC provides the access point for remote commands from external management software and generates alerts to that software. The ME plays the role of an IPMI satellite controller that communicates to the Integrated BMC over a secondary IPMB. There are mechanisms to forward commands to ME and send response back to originator. Similarly events generated by ME to the Integrated BMC (through IPMB) have to be sent by the Integrated BMC to the external software over the LAN link. It is the responsibility of Integrated BMC to implement these mechanisms for communication with Node Manager (NM). 4.4.3.1.1 Command Passing Through Integrated BMC External software wishing to communicate with the NM will send 'bridged' IPMI commands to Integrated BMC. This will be in the form an IPMI packet encapsulated in another packet, following standard IPMI bridging as described in the IPMI 2.0 Specification. Integrated BMC forwards the encapsulated command it to NM engine on the ME and returns the response to the sender. Due to the fact that some of the NM commands have potential for performance limiting and system shut-down, the Integrated BMC firmware enforce an administrator privilege for any commands bridged to the ME. 4.4.3.1.2 Alerting Alerts may be sent from the NM in the ME to the external software by one of two different methods depending on the nature of the alert. Alerts that signify fault conditions that should be recorded in the system SEL will be sent to the Integrated BMC by the ME using the IPMI Platform Event Message command. The Integrated BMC deposits such events into the SEL. The external software must configure the Integrated BMC's PEF and alerting features to then send that event out as an IPMI LAN alert, directed to the software application over the LAN link. Alerts that provide useful notification to the external software for NM management, but do not represent significant fault conditions that need to be put into the SEL, will be sent to the Integrated BMC using the IPMI Alert Immediate command. This requires that the external software application provide the NM on the ME with the alert destination and alert string information needed to properly form and send the alert. The external software must first properly configure the alert destination and string in the Integrated BMC LAN configuration using standard IPMI commands, then provide the associated selectors to the Integrated BMC using the "Set Node Manager Alert Destination" OEM command. 4.4.3.2 BIOS-Integreated BMC-ME Communication In this generation of platforms, the BIOS communicates directly with the ME through HECI. 48 Revision 2.0 Intel order number G13326-004

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Platform Management
Intel®
Server Board S1200BT TPS
Revision 2.0
Intel order number G13326-004
48
4.4.3.1
External Communications Link
The Integrated BMC provides the access point for remote commands from external
management software and generates alerts to that software.
The ME plays the role of an IPMI
satellite controller that communicates to the Integrated BMC over a secondary IPMB. There are
mechanisms to forward commands to ME and send response back to originator. Similarly
events generated by ME to the Integrated BMC (through IPMB) have to be sent by the
Integrated BMC to the external software over the LAN link. It is the responsibility of Integrated
BMC to implement these mechanisms for communication with Node Manager (NM).
4.4.3.1.1
Command Passing Through Integrated BMC
External software
wishing to communicate with the NM will send ‘bridged’ IPMI commands to
Integrated BMC. This will be in the form an IPMI packet encapsulated in another packet,
following standard IPMI bridging as described in the
IPMI 2.0 Specification
. Integrated BMC
forwards the encapsulated command it to NM engine on the ME and returns the response to
the sender.
Due to the fact that some of the NM commands have potential for performance limiting and
system shut-down, the Integrated BMC firmware enforce an administrator privilege for any
commands bridged to the ME.
4.4.3.1.2
Alerting
Alerts may be sent from the NM in the ME to the external software by one of two different
methods depending on the nature of the alert.
Alerts that signify fault conditions that should be recorded in the system SEL will be sent to the
Integrated BMC by the ME using the IPMI Platform Event Message command. The Integrated
BMC deposits such events into the SEL.
The external software must configure the Integrated
BMC’s PEF and alerting features to then send that event out as an IPMI LAN alert, directed to
the software application over the LAN link.
Alerts that provide useful notification to the external software for NM management, but do not
represent significant fault conditions that need to be put into the SEL, will be sent to the
Integrated BMC using the IPMI Alert Immediate command. This requires that the external
software application provide the NM on the ME with the alert destination and alert string
information needed to properly form and send the alert.
The external software must first
properly configure the alert destination and string in the Integrated BMC LAN configuration
using standard IPMI commands, then provide the associated selectors to the Integrated BMC
using the “Set Node Manager Alert Destination” OEM command.
4.4.3.2
BIOS-Integreated BMC-ME Communication
In this generation of platforms, the BIOS communicates directly with the ME through HECI.