Intel® Server Board X38ML
Platform Management
Revision 1.3
Intel order number E15331-006
73
Table 37. Standard Channel Assignments
Channel ID
Interface
Supports
Sessions
0 IPMB
No
1 LAN
1
Yes
4 Reserved
N/A
5 Reserved
N/A
6 Reserved
N/A
7 SMM
No
0Eh Self
1
N/A
0Fh
SMS/Receive Message Queue
No
Note:
1. Refers to the channel used to send the request.
5.19.2
User Model
The BMC supports the IPMI 2.0 user model including
User ID 1
support. A total of 15 user IDs
are supported, that includes
User ID 1
. The users can be assigned to any channel.
5.19.3
Sessions
The BMC supports a maximum of four simultaneous sessions. They are shared across all
session-based channels. The BMC also supports multiple sessions on a given channel.
5.19.4
Media Bridging
The BMC supports bridging between the LAN and IPMB interfaces. This allows the state of
other intelligent controllers in the chassis to be queried by remote console software. Requests
may be directed to controllers on the IPMB, but requests originating on the IPMB cannot be
directed to the LAN interface.
5.19.5
Request/Response Protocol
The protocols are request/response protocols. A request message is issued to an intelligent
device that responds with a response message. For example, both request messages and
response messages in the IPMB are transmitted on the bus using I
2
C master write transfers. An
intelligent device acting as an I
2
C master issues a request message. This is received by an
intelligent device as an I
2
C slave. The corresponding response message is issued from the
responding intelligent device as an I
2
C master, and is received by the request originator as an
I
2
C slave.
5.19.6
Host to BMC Communication Interface
5.19.6.1
LPC/KCS Interface
The BMC has three 8042 keyboard controller style (KCS) interface ports as described in the
IPMI 2.0 specification. These interfaces are mapped into the host I/O space and accessed via
the chipset LPC bus.
These interfaces are assigned with the following uses and addresses:
