Host Interface
Keyboard Controller Style (KCS) interface
It follows Intel 8742 bit definitions and operation. This KCS interface is decoded by LPC hardware interface in BMC.
Data is transferred across the KCS interface using a per-byte handshake. BMC support three KCS channels. The SMS
channel is compliant to IPMI specification. For the details of KCS registers definition, please refer chapter 9 of IPMI
specification v2.0. Below is the IO address list for KCS channels (‘Channel’ referring here is different from IPMI channels,
which describes KCS has dual interface for host to use).
I/O Type
KCS
Channel
0 (SMS)
1
Status Register
0xCA2 0xCA8
Data Register
0xCA3 0xCAC
IPMB interface
IPMB interface can be assigned to one of the I2C interface, BMC serves as a controller to give system software access to the
IPMB. BMC provides Master Write-Read command via its interface with SMS. SMS can access other management
controllers through this IPMB interface.
LAN interface
BMC LAN interface in AST2050 is assigned to its Shared Nic LAN(Default) in S99K 2U. Shared/Dedicated Nics both are
supported. IPMI Specification v2.0 defines how IPMI messages, encapsulated in RMCP/RMCP+ packet format, can be sent
to and from the BMC. This capability allows a remote console application to access the BMC and perform the following
operations:
Chassis Control, e.g., get chassis status, reset chassis, power-up chassis, power-down chassis
Get system sensor status
Get and Set system boot options
Get Field Replaceable Unit (FRU) information
Get System Event Log (SEL) entries
Get Sensor Data Records (SDR)
Set Platform Event Filtering (PEF)
Set LAN configurations
In addition, the BMC supports LAN alerting in the form of SNMP traps that conform to the IPMI Platform Event Trap (PET)
format.
Chapter 4 — BMC
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